Sun, 02 Mar 2008 16:10:12 -0800
6557851: CMS: ergonomics defaults are not set with FLAG_SET_ERGO
Summary: Default values set by cms ergonomics are set with FLAG_SET_DEFAULT so down stream the values look like the default values and affect how later parameters are set. Set these values with FLAG_SET_ERGO instead and adjust how later parameters are interpreted.
Reviewed-by: iveresov, apetrusenko, pbk, ysr
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | # include "incls/_precompiled.incl" |
duke@435 | 26 | # include "incls/_thread.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | #ifdef DTRACE_ENABLED |
duke@435 | 29 | |
duke@435 | 30 | // Only bother with this argument setup if dtrace is available |
duke@435 | 31 | |
duke@435 | 32 | HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
duke@435 | 33 | HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); |
duke@435 | 34 | HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, |
duke@435 | 35 | intptr_t, intptr_t, bool); |
duke@435 | 36 | HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, |
duke@435 | 37 | intptr_t, intptr_t, bool); |
duke@435 | 38 | |
duke@435 | 39 | #define DTRACE_THREAD_PROBE(probe, javathread) \ |
duke@435 | 40 | { \ |
duke@435 | 41 | ResourceMark rm(this); \ |
duke@435 | 42 | int len = 0; \ |
duke@435 | 43 | const char* name = (javathread)->get_thread_name(); \ |
duke@435 | 44 | len = strlen(name); \ |
duke@435 | 45 | HS_DTRACE_PROBE5(hotspot, thread__##probe, \ |
duke@435 | 46 | name, len, \ |
duke@435 | 47 | java_lang_Thread::thread_id((javathread)->threadObj()), \ |
duke@435 | 48 | (javathread)->osthread()->thread_id(), \ |
duke@435 | 49 | java_lang_Thread::is_daemon((javathread)->threadObj())); \ |
duke@435 | 50 | } |
duke@435 | 51 | |
duke@435 | 52 | #else // ndef DTRACE_ENABLED |
duke@435 | 53 | |
duke@435 | 54 | #define DTRACE_THREAD_PROBE(probe, javathread) |
duke@435 | 55 | |
duke@435 | 56 | #endif // ndef DTRACE_ENABLED |
duke@435 | 57 | |
duke@435 | 58 | // Class hierarchy |
duke@435 | 59 | // - Thread |
duke@435 | 60 | // - VMThread |
duke@435 | 61 | // - WatcherThread |
duke@435 | 62 | // - ConcurrentMarkSweepThread |
duke@435 | 63 | // - JavaThread |
duke@435 | 64 | // - CompilerThread |
duke@435 | 65 | |
duke@435 | 66 | // ======= Thread ======== |
duke@435 | 67 | |
duke@435 | 68 | // Support for forcing alignment of thread objects for biased locking |
duke@435 | 69 | void* Thread::operator new(size_t size) { |
duke@435 | 70 | if (UseBiasedLocking) { |
duke@435 | 71 | const int alignment = markOopDesc::biased_lock_alignment; |
duke@435 | 72 | size_t aligned_size = size + (alignment - sizeof(intptr_t)); |
duke@435 | 73 | void* real_malloc_addr = CHeapObj::operator new(aligned_size); |
duke@435 | 74 | void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
duke@435 | 75 | assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= |
duke@435 | 76 | ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), |
duke@435 | 77 | "JavaThread alignment code overflowed allocated storage"); |
duke@435 | 78 | if (TraceBiasedLocking) { |
duke@435 | 79 | if (aligned_addr != real_malloc_addr) |
duke@435 | 80 | tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, |
duke@435 | 81 | real_malloc_addr, aligned_addr); |
duke@435 | 82 | } |
duke@435 | 83 | ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; |
duke@435 | 84 | return aligned_addr; |
duke@435 | 85 | } else { |
duke@435 | 86 | return CHeapObj::operator new(size); |
duke@435 | 87 | } |
duke@435 | 88 | } |
duke@435 | 89 | |
duke@435 | 90 | void Thread::operator delete(void* p) { |
duke@435 | 91 | if (UseBiasedLocking) { |
duke@435 | 92 | void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; |
duke@435 | 93 | CHeapObj::operator delete(real_malloc_addr); |
duke@435 | 94 | } else { |
duke@435 | 95 | CHeapObj::operator delete(p); |
duke@435 | 96 | } |
duke@435 | 97 | } |
duke@435 | 98 | |
duke@435 | 99 | |
duke@435 | 100 | // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, |
duke@435 | 101 | // JavaThread |
duke@435 | 102 | |
duke@435 | 103 | |
duke@435 | 104 | Thread::Thread() { |
duke@435 | 105 | // stack |
duke@435 | 106 | _stack_base = NULL; |
duke@435 | 107 | _stack_size = 0; |
duke@435 | 108 | _self_raw_id = 0; |
duke@435 | 109 | _lgrp_id = -1; |
duke@435 | 110 | _osthread = NULL; |
duke@435 | 111 | |
duke@435 | 112 | // allocated data structures |
duke@435 | 113 | set_resource_area(new ResourceArea()); |
duke@435 | 114 | set_handle_area(new HandleArea(NULL)); |
duke@435 | 115 | set_active_handles(NULL); |
duke@435 | 116 | set_free_handle_block(NULL); |
duke@435 | 117 | set_last_handle_mark(NULL); |
duke@435 | 118 | set_osthread(NULL); |
duke@435 | 119 | |
duke@435 | 120 | // This initial value ==> never claimed. |
duke@435 | 121 | _oops_do_parity = 0; |
duke@435 | 122 | |
duke@435 | 123 | // the handle mark links itself to last_handle_mark |
duke@435 | 124 | new HandleMark(this); |
duke@435 | 125 | |
duke@435 | 126 | // plain initialization |
duke@435 | 127 | debug_only(_owned_locks = NULL;) |
duke@435 | 128 | debug_only(_allow_allocation_count = 0;) |
duke@435 | 129 | NOT_PRODUCT(_allow_safepoint_count = 0;) |
duke@435 | 130 | CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
duke@435 | 131 | _highest_lock = NULL; |
duke@435 | 132 | _jvmti_env_iteration_count = 0; |
duke@435 | 133 | _vm_operation_started_count = 0; |
duke@435 | 134 | _vm_operation_completed_count = 0; |
duke@435 | 135 | _current_pending_monitor = NULL; |
duke@435 | 136 | _current_pending_monitor_is_from_java = true; |
duke@435 | 137 | _current_waiting_monitor = NULL; |
duke@435 | 138 | _num_nested_signal = 0; |
duke@435 | 139 | omFreeList = NULL ; |
duke@435 | 140 | omFreeCount = 0 ; |
duke@435 | 141 | omFreeProvision = 32 ; |
duke@435 | 142 | |
duke@435 | 143 | _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
duke@435 | 144 | _suspend_flags = 0; |
duke@435 | 145 | |
duke@435 | 146 | // thread-specific hashCode stream generator state - Marsaglia shift-xor form |
duke@435 | 147 | _hashStateX = os::random() ; |
duke@435 | 148 | _hashStateY = 842502087 ; |
duke@435 | 149 | _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; |
duke@435 | 150 | _hashStateW = 273326509 ; |
duke@435 | 151 | |
duke@435 | 152 | _OnTrap = 0 ; |
duke@435 | 153 | _schedctl = NULL ; |
duke@435 | 154 | _Stalled = 0 ; |
duke@435 | 155 | _TypeTag = 0x2BAD ; |
duke@435 | 156 | |
duke@435 | 157 | // Many of the following fields are effectively final - immutable |
duke@435 | 158 | // Note that nascent threads can't use the Native Monitor-Mutex |
duke@435 | 159 | // construct until the _MutexEvent is initialized ... |
duke@435 | 160 | // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents |
duke@435 | 161 | // we might instead use a stack of ParkEvents that we could provision on-demand. |
duke@435 | 162 | // The stack would act as a cache to avoid calls to ParkEvent::Allocate() |
duke@435 | 163 | // and ::Release() |
duke@435 | 164 | _ParkEvent = ParkEvent::Allocate (this) ; |
duke@435 | 165 | _SleepEvent = ParkEvent::Allocate (this) ; |
duke@435 | 166 | _MutexEvent = ParkEvent::Allocate (this) ; |
duke@435 | 167 | _MuxEvent = ParkEvent::Allocate (this) ; |
duke@435 | 168 | |
duke@435 | 169 | #ifdef CHECK_UNHANDLED_OOPS |
duke@435 | 170 | if (CheckUnhandledOops) { |
duke@435 | 171 | _unhandled_oops = new UnhandledOops(this); |
duke@435 | 172 | } |
duke@435 | 173 | #endif // CHECK_UNHANDLED_OOPS |
duke@435 | 174 | #ifdef ASSERT |
duke@435 | 175 | if (UseBiasedLocking) { |
duke@435 | 176 | assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); |
duke@435 | 177 | assert(this == _real_malloc_address || |
duke@435 | 178 | this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), |
duke@435 | 179 | "bug in forced alignment of thread objects"); |
duke@435 | 180 | } |
duke@435 | 181 | #endif /* ASSERT */ |
duke@435 | 182 | } |
duke@435 | 183 | |
duke@435 | 184 | void Thread::initialize_thread_local_storage() { |
duke@435 | 185 | // Note: Make sure this method only calls |
duke@435 | 186 | // non-blocking operations. Otherwise, it might not work |
duke@435 | 187 | // with the thread-startup/safepoint interaction. |
duke@435 | 188 | |
duke@435 | 189 | // During Java thread startup, safepoint code should allow this |
duke@435 | 190 | // method to complete because it may need to allocate memory to |
duke@435 | 191 | // store information for the new thread. |
duke@435 | 192 | |
duke@435 | 193 | // initialize structure dependent on thread local storage |
duke@435 | 194 | ThreadLocalStorage::set_thread(this); |
duke@435 | 195 | |
duke@435 | 196 | // set up any platform-specific state. |
duke@435 | 197 | os::initialize_thread(); |
duke@435 | 198 | |
duke@435 | 199 | } |
duke@435 | 200 | |
duke@435 | 201 | void Thread::record_stack_base_and_size() { |
duke@435 | 202 | set_stack_base(os::current_stack_base()); |
duke@435 | 203 | set_stack_size(os::current_stack_size()); |
duke@435 | 204 | } |
duke@435 | 205 | |
duke@435 | 206 | |
duke@435 | 207 | Thread::~Thread() { |
duke@435 | 208 | // Reclaim the objectmonitors from the omFreeList of the moribund thread. |
duke@435 | 209 | ObjectSynchronizer::omFlush (this) ; |
duke@435 | 210 | |
duke@435 | 211 | // deallocate data structures |
duke@435 | 212 | delete resource_area(); |
duke@435 | 213 | // since the handle marks are using the handle area, we have to deallocated the root |
duke@435 | 214 | // handle mark before deallocating the thread's handle area, |
duke@435 | 215 | assert(last_handle_mark() != NULL, "check we have an element"); |
duke@435 | 216 | delete last_handle_mark(); |
duke@435 | 217 | assert(last_handle_mark() == NULL, "check we have reached the end"); |
duke@435 | 218 | |
duke@435 | 219 | // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. |
duke@435 | 220 | // We NULL out the fields for good hygiene. |
duke@435 | 221 | ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; |
duke@435 | 222 | ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; |
duke@435 | 223 | ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; |
duke@435 | 224 | ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; |
duke@435 | 225 | |
duke@435 | 226 | delete handle_area(); |
duke@435 | 227 | |
duke@435 | 228 | // osthread() can be NULL, if creation of thread failed. |
duke@435 | 229 | if (osthread() != NULL) os::free_thread(osthread()); |
duke@435 | 230 | |
duke@435 | 231 | delete _SR_lock; |
duke@435 | 232 | |
duke@435 | 233 | // clear thread local storage if the Thread is deleting itself |
duke@435 | 234 | if (this == Thread::current()) { |
duke@435 | 235 | ThreadLocalStorage::set_thread(NULL); |
duke@435 | 236 | } else { |
duke@435 | 237 | // In the case where we're not the current thread, invalidate all the |
duke@435 | 238 | // caches in case some code tries to get the current thread or the |
duke@435 | 239 | // thread that was destroyed, and gets stale information. |
duke@435 | 240 | ThreadLocalStorage::invalidate_all(); |
duke@435 | 241 | } |
duke@435 | 242 | CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) |
duke@435 | 243 | } |
duke@435 | 244 | |
duke@435 | 245 | // NOTE: dummy function for assertion purpose. |
duke@435 | 246 | void Thread::run() { |
duke@435 | 247 | ShouldNotReachHere(); |
duke@435 | 248 | } |
duke@435 | 249 | |
duke@435 | 250 | #ifdef ASSERT |
duke@435 | 251 | // Private method to check for dangling thread pointer |
duke@435 | 252 | void check_for_dangling_thread_pointer(Thread *thread) { |
duke@435 | 253 | assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), |
duke@435 | 254 | "possibility of dangling Thread pointer"); |
duke@435 | 255 | } |
duke@435 | 256 | #endif |
duke@435 | 257 | |
duke@435 | 258 | |
duke@435 | 259 | #ifndef PRODUCT |
duke@435 | 260 | // Tracing method for basic thread operations |
duke@435 | 261 | void Thread::trace(const char* msg, const Thread* const thread) { |
duke@435 | 262 | if (!TraceThreadEvents) return; |
duke@435 | 263 | ResourceMark rm; |
duke@435 | 264 | ThreadCritical tc; |
duke@435 | 265 | const char *name = "non-Java thread"; |
duke@435 | 266 | int prio = -1; |
duke@435 | 267 | if (thread->is_Java_thread() |
duke@435 | 268 | && !thread->is_Compiler_thread()) { |
duke@435 | 269 | // The Threads_lock must be held to get information about |
duke@435 | 270 | // this thread but may not be in some situations when |
duke@435 | 271 | // tracing thread events. |
duke@435 | 272 | bool release_Threads_lock = false; |
duke@435 | 273 | if (!Threads_lock->owned_by_self()) { |
duke@435 | 274 | Threads_lock->lock(); |
duke@435 | 275 | release_Threads_lock = true; |
duke@435 | 276 | } |
duke@435 | 277 | JavaThread* jt = (JavaThread *)thread; |
duke@435 | 278 | name = (char *)jt->get_thread_name(); |
duke@435 | 279 | oop thread_oop = jt->threadObj(); |
duke@435 | 280 | if (thread_oop != NULL) { |
duke@435 | 281 | prio = java_lang_Thread::priority(thread_oop); |
duke@435 | 282 | } |
duke@435 | 283 | if (release_Threads_lock) { |
duke@435 | 284 | Threads_lock->unlock(); |
duke@435 | 285 | } |
duke@435 | 286 | } |
duke@435 | 287 | tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); |
duke@435 | 288 | } |
duke@435 | 289 | #endif |
duke@435 | 290 | |
duke@435 | 291 | |
duke@435 | 292 | ThreadPriority Thread::get_priority(const Thread* const thread) { |
duke@435 | 293 | trace("get priority", thread); |
duke@435 | 294 | ThreadPriority priority; |
duke@435 | 295 | // Can return an error! |
duke@435 | 296 | (void)os::get_priority(thread, priority); |
duke@435 | 297 | assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); |
duke@435 | 298 | return priority; |
duke@435 | 299 | } |
duke@435 | 300 | |
duke@435 | 301 | void Thread::set_priority(Thread* thread, ThreadPriority priority) { |
duke@435 | 302 | trace("set priority", thread); |
duke@435 | 303 | debug_only(check_for_dangling_thread_pointer(thread);) |
duke@435 | 304 | // Can return an error! |
duke@435 | 305 | (void)os::set_priority(thread, priority); |
duke@435 | 306 | } |
duke@435 | 307 | |
duke@435 | 308 | |
duke@435 | 309 | void Thread::start(Thread* thread) { |
duke@435 | 310 | trace("start", thread); |
duke@435 | 311 | // Start is different from resume in that its safety is guaranteed by context or |
duke@435 | 312 | // being called from a Java method synchronized on the Thread object. |
duke@435 | 313 | if (!DisableStartThread) { |
duke@435 | 314 | if (thread->is_Java_thread()) { |
duke@435 | 315 | // Initialize the thread state to RUNNABLE before starting this thread. |
duke@435 | 316 | // Can not set it after the thread started because we do not know the |
duke@435 | 317 | // exact thread state at that time. It could be in MONITOR_WAIT or |
duke@435 | 318 | // in SLEEPING or some other state. |
duke@435 | 319 | java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), |
duke@435 | 320 | java_lang_Thread::RUNNABLE); |
duke@435 | 321 | } |
duke@435 | 322 | os::start_thread(thread); |
duke@435 | 323 | } |
duke@435 | 324 | } |
duke@435 | 325 | |
duke@435 | 326 | // Enqueue a VM_Operation to do the job for us - sometime later |
duke@435 | 327 | void Thread::send_async_exception(oop java_thread, oop java_throwable) { |
duke@435 | 328 | VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); |
duke@435 | 329 | VMThread::execute(vm_stop); |
duke@435 | 330 | } |
duke@435 | 331 | |
duke@435 | 332 | |
duke@435 | 333 | // |
duke@435 | 334 | // Check if an external suspend request has completed (or has been |
duke@435 | 335 | // cancelled). Returns true if the thread is externally suspended and |
duke@435 | 336 | // false otherwise. |
duke@435 | 337 | // |
duke@435 | 338 | // The bits parameter returns information about the code path through |
duke@435 | 339 | // the routine. Useful for debugging: |
duke@435 | 340 | // |
duke@435 | 341 | // set in is_ext_suspend_completed(): |
duke@435 | 342 | // 0x00000001 - routine was entered |
duke@435 | 343 | // 0x00000010 - routine return false at end |
duke@435 | 344 | // 0x00000100 - thread exited (return false) |
duke@435 | 345 | // 0x00000200 - suspend request cancelled (return false) |
duke@435 | 346 | // 0x00000400 - thread suspended (return true) |
duke@435 | 347 | // 0x00001000 - thread is in a suspend equivalent state (return true) |
duke@435 | 348 | // 0x00002000 - thread is native and walkable (return true) |
duke@435 | 349 | // 0x00004000 - thread is native_trans and walkable (needed retry) |
duke@435 | 350 | // |
duke@435 | 351 | // set in wait_for_ext_suspend_completion(): |
duke@435 | 352 | // 0x00010000 - routine was entered |
duke@435 | 353 | // 0x00020000 - suspend request cancelled before loop (return false) |
duke@435 | 354 | // 0x00040000 - thread suspended before loop (return true) |
duke@435 | 355 | // 0x00080000 - suspend request cancelled in loop (return false) |
duke@435 | 356 | // 0x00100000 - thread suspended in loop (return true) |
duke@435 | 357 | // 0x00200000 - suspend not completed during retry loop (return false) |
duke@435 | 358 | // |
duke@435 | 359 | |
duke@435 | 360 | // Helper class for tracing suspend wait debug bits. |
duke@435 | 361 | // |
duke@435 | 362 | // 0x00000100 indicates that the target thread exited before it could |
duke@435 | 363 | // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and |
duke@435 | 364 | // 0x00080000 each indicate a cancelled suspend request so they don't |
duke@435 | 365 | // count as wait failures either. |
duke@435 | 366 | #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) |
duke@435 | 367 | |
duke@435 | 368 | class TraceSuspendDebugBits : public StackObj { |
duke@435 | 369 | private: |
duke@435 | 370 | JavaThread * jt; |
duke@435 | 371 | bool is_wait; |
duke@435 | 372 | bool called_by_wait; // meaningful when !is_wait |
duke@435 | 373 | uint32_t * bits; |
duke@435 | 374 | |
duke@435 | 375 | public: |
duke@435 | 376 | TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, |
duke@435 | 377 | uint32_t *_bits) { |
duke@435 | 378 | jt = _jt; |
duke@435 | 379 | is_wait = _is_wait; |
duke@435 | 380 | called_by_wait = _called_by_wait; |
duke@435 | 381 | bits = _bits; |
duke@435 | 382 | } |
duke@435 | 383 | |
duke@435 | 384 | ~TraceSuspendDebugBits() { |
duke@435 | 385 | if (!is_wait) { |
duke@435 | 386 | #if 1 |
duke@435 | 387 | // By default, don't trace bits for is_ext_suspend_completed() calls. |
duke@435 | 388 | // That trace is very chatty. |
duke@435 | 389 | return; |
duke@435 | 390 | #else |
duke@435 | 391 | if (!called_by_wait) { |
duke@435 | 392 | // If tracing for is_ext_suspend_completed() is enabled, then only |
duke@435 | 393 | // trace calls to it from wait_for_ext_suspend_completion() |
duke@435 | 394 | return; |
duke@435 | 395 | } |
duke@435 | 396 | #endif |
duke@435 | 397 | } |
duke@435 | 398 | |
duke@435 | 399 | if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { |
duke@435 | 400 | if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { |
duke@435 | 401 | MutexLocker ml(Threads_lock); // needed for get_thread_name() |
duke@435 | 402 | ResourceMark rm; |
duke@435 | 403 | |
duke@435 | 404 | tty->print_cr( |
duke@435 | 405 | "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", |
duke@435 | 406 | jt->get_thread_name(), *bits); |
duke@435 | 407 | |
duke@435 | 408 | guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); |
duke@435 | 409 | } |
duke@435 | 410 | } |
duke@435 | 411 | } |
duke@435 | 412 | }; |
duke@435 | 413 | #undef DEBUG_FALSE_BITS |
duke@435 | 414 | |
duke@435 | 415 | |
duke@435 | 416 | bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { |
duke@435 | 417 | TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); |
duke@435 | 418 | |
duke@435 | 419 | bool did_trans_retry = false; // only do thread_in_native_trans retry once |
duke@435 | 420 | bool do_trans_retry; // flag to force the retry |
duke@435 | 421 | |
duke@435 | 422 | *bits |= 0x00000001; |
duke@435 | 423 | |
duke@435 | 424 | do { |
duke@435 | 425 | do_trans_retry = false; |
duke@435 | 426 | |
duke@435 | 427 | if (is_exiting()) { |
duke@435 | 428 | // Thread is in the process of exiting. This is always checked |
duke@435 | 429 | // first to reduce the risk of dereferencing a freed JavaThread. |
duke@435 | 430 | *bits |= 0x00000100; |
duke@435 | 431 | return false; |
duke@435 | 432 | } |
duke@435 | 433 | |
duke@435 | 434 | if (!is_external_suspend()) { |
duke@435 | 435 | // Suspend request is cancelled. This is always checked before |
duke@435 | 436 | // is_ext_suspended() to reduce the risk of a rogue resume |
duke@435 | 437 | // confusing the thread that made the suspend request. |
duke@435 | 438 | *bits |= 0x00000200; |
duke@435 | 439 | return false; |
duke@435 | 440 | } |
duke@435 | 441 | |
duke@435 | 442 | if (is_ext_suspended()) { |
duke@435 | 443 | // thread is suspended |
duke@435 | 444 | *bits |= 0x00000400; |
duke@435 | 445 | return true; |
duke@435 | 446 | } |
duke@435 | 447 | |
duke@435 | 448 | // Now that we no longer do hard suspends of threads running |
duke@435 | 449 | // native code, the target thread can be changing thread state |
duke@435 | 450 | // while we are in this routine: |
duke@435 | 451 | // |
duke@435 | 452 | // _thread_in_native -> _thread_in_native_trans -> _thread_blocked |
duke@435 | 453 | // |
duke@435 | 454 | // We save a copy of the thread state as observed at this moment |
duke@435 | 455 | // and make our decision about suspend completeness based on the |
duke@435 | 456 | // copy. This closes the race where the thread state is seen as |
duke@435 | 457 | // _thread_in_native_trans in the if-thread_blocked check, but is |
duke@435 | 458 | // seen as _thread_blocked in if-thread_in_native_trans check. |
duke@435 | 459 | JavaThreadState save_state = thread_state(); |
duke@435 | 460 | |
duke@435 | 461 | if (save_state == _thread_blocked && is_suspend_equivalent()) { |
duke@435 | 462 | // If the thread's state is _thread_blocked and this blocking |
duke@435 | 463 | // condition is known to be equivalent to a suspend, then we can |
duke@435 | 464 | // consider the thread to be externally suspended. This means that |
duke@435 | 465 | // the code that sets _thread_blocked has been modified to do |
duke@435 | 466 | // self-suspension if the blocking condition releases. We also |
duke@435 | 467 | // used to check for CONDVAR_WAIT here, but that is now covered by |
duke@435 | 468 | // the _thread_blocked with self-suspension check. |
duke@435 | 469 | // |
duke@435 | 470 | // Return true since we wouldn't be here unless there was still an |
duke@435 | 471 | // external suspend request. |
duke@435 | 472 | *bits |= 0x00001000; |
duke@435 | 473 | return true; |
duke@435 | 474 | } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { |
duke@435 | 475 | // Threads running native code will self-suspend on native==>VM/Java |
duke@435 | 476 | // transitions. If its stack is walkable (should always be the case |
duke@435 | 477 | // unless this function is called before the actual java_suspend() |
duke@435 | 478 | // call), then the wait is done. |
duke@435 | 479 | *bits |= 0x00002000; |
duke@435 | 480 | return true; |
duke@435 | 481 | } else if (!called_by_wait && !did_trans_retry && |
duke@435 | 482 | save_state == _thread_in_native_trans && |
duke@435 | 483 | frame_anchor()->walkable()) { |
duke@435 | 484 | // The thread is transitioning from thread_in_native to another |
duke@435 | 485 | // thread state. check_safepoint_and_suspend_for_native_trans() |
duke@435 | 486 | // will force the thread to self-suspend. If it hasn't gotten |
duke@435 | 487 | // there yet we may have caught the thread in-between the native |
duke@435 | 488 | // code check above and the self-suspend. Lucky us. If we were |
duke@435 | 489 | // called by wait_for_ext_suspend_completion(), then it |
duke@435 | 490 | // will be doing the retries so we don't have to. |
duke@435 | 491 | // |
duke@435 | 492 | // Since we use the saved thread state in the if-statement above, |
duke@435 | 493 | // there is a chance that the thread has already transitioned to |
duke@435 | 494 | // _thread_blocked by the time we get here. In that case, we will |
duke@435 | 495 | // make a single unnecessary pass through the logic below. This |
duke@435 | 496 | // doesn't hurt anything since we still do the trans retry. |
duke@435 | 497 | |
duke@435 | 498 | *bits |= 0x00004000; |
duke@435 | 499 | |
duke@435 | 500 | // Once the thread leaves thread_in_native_trans for another |
duke@435 | 501 | // thread state, we break out of this retry loop. We shouldn't |
duke@435 | 502 | // need this flag to prevent us from getting back here, but |
duke@435 | 503 | // sometimes paranoia is good. |
duke@435 | 504 | did_trans_retry = true; |
duke@435 | 505 | |
duke@435 | 506 | // We wait for the thread to transition to a more usable state. |
duke@435 | 507 | for (int i = 1; i <= SuspendRetryCount; i++) { |
duke@435 | 508 | // We used to do an "os::yield_all(i)" call here with the intention |
duke@435 | 509 | // that yielding would increase on each retry. However, the parameter |
duke@435 | 510 | // is ignored on Linux which means the yield didn't scale up. Waiting |
duke@435 | 511 | // on the SR_lock below provides a much more predictable scale up for |
duke@435 | 512 | // the delay. It also provides a simple/direct point to check for any |
duke@435 | 513 | // safepoint requests from the VMThread |
duke@435 | 514 | |
duke@435 | 515 | // temporarily drops SR_lock while doing wait with safepoint check |
duke@435 | 516 | // (if we're a JavaThread - the WatcherThread can also call this) |
duke@435 | 517 | // and increase delay with each retry |
duke@435 | 518 | SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); |
duke@435 | 519 | |
duke@435 | 520 | // check the actual thread state instead of what we saved above |
duke@435 | 521 | if (thread_state() != _thread_in_native_trans) { |
duke@435 | 522 | // the thread has transitioned to another thread state so |
duke@435 | 523 | // try all the checks (except this one) one more time. |
duke@435 | 524 | do_trans_retry = true; |
duke@435 | 525 | break; |
duke@435 | 526 | } |
duke@435 | 527 | } // end retry loop |
duke@435 | 528 | |
duke@435 | 529 | |
duke@435 | 530 | } |
duke@435 | 531 | } while (do_trans_retry); |
duke@435 | 532 | |
duke@435 | 533 | *bits |= 0x00000010; |
duke@435 | 534 | return false; |
duke@435 | 535 | } |
duke@435 | 536 | |
duke@435 | 537 | // |
duke@435 | 538 | // Wait for an external suspend request to complete (or be cancelled). |
duke@435 | 539 | // Returns true if the thread is externally suspended and false otherwise. |
duke@435 | 540 | // |
duke@435 | 541 | bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, |
duke@435 | 542 | uint32_t *bits) { |
duke@435 | 543 | TraceSuspendDebugBits tsdb(this, true /* is_wait */, |
duke@435 | 544 | false /* !called_by_wait */, bits); |
duke@435 | 545 | |
duke@435 | 546 | // local flag copies to minimize SR_lock hold time |
duke@435 | 547 | bool is_suspended; |
duke@435 | 548 | bool pending; |
duke@435 | 549 | uint32_t reset_bits; |
duke@435 | 550 | |
duke@435 | 551 | // set a marker so is_ext_suspend_completed() knows we are the caller |
duke@435 | 552 | *bits |= 0x00010000; |
duke@435 | 553 | |
duke@435 | 554 | // We use reset_bits to reinitialize the bits value at the top of |
duke@435 | 555 | // each retry loop. This allows the caller to make use of any |
duke@435 | 556 | // unused bits for their own marking purposes. |
duke@435 | 557 | reset_bits = *bits; |
duke@435 | 558 | |
duke@435 | 559 | { |
duke@435 | 560 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 561 | is_suspended = is_ext_suspend_completed(true /* called_by_wait */, |
duke@435 | 562 | delay, bits); |
duke@435 | 563 | pending = is_external_suspend(); |
duke@435 | 564 | } |
duke@435 | 565 | // must release SR_lock to allow suspension to complete |
duke@435 | 566 | |
duke@435 | 567 | if (!pending) { |
duke@435 | 568 | // A cancelled suspend request is the only false return from |
duke@435 | 569 | // is_ext_suspend_completed() that keeps us from entering the |
duke@435 | 570 | // retry loop. |
duke@435 | 571 | *bits |= 0x00020000; |
duke@435 | 572 | return false; |
duke@435 | 573 | } |
duke@435 | 574 | |
duke@435 | 575 | if (is_suspended) { |
duke@435 | 576 | *bits |= 0x00040000; |
duke@435 | 577 | return true; |
duke@435 | 578 | } |
duke@435 | 579 | |
duke@435 | 580 | for (int i = 1; i <= retries; i++) { |
duke@435 | 581 | *bits = reset_bits; // reinit to only track last retry |
duke@435 | 582 | |
duke@435 | 583 | // We used to do an "os::yield_all(i)" call here with the intention |
duke@435 | 584 | // that yielding would increase on each retry. However, the parameter |
duke@435 | 585 | // is ignored on Linux which means the yield didn't scale up. Waiting |
duke@435 | 586 | // on the SR_lock below provides a much more predictable scale up for |
duke@435 | 587 | // the delay. It also provides a simple/direct point to check for any |
duke@435 | 588 | // safepoint requests from the VMThread |
duke@435 | 589 | |
duke@435 | 590 | { |
duke@435 | 591 | MutexLocker ml(SR_lock()); |
duke@435 | 592 | // wait with safepoint check (if we're a JavaThread - the WatcherThread |
duke@435 | 593 | // can also call this) and increase delay with each retry |
duke@435 | 594 | SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); |
duke@435 | 595 | |
duke@435 | 596 | is_suspended = is_ext_suspend_completed(true /* called_by_wait */, |
duke@435 | 597 | delay, bits); |
duke@435 | 598 | |
duke@435 | 599 | // It is possible for the external suspend request to be cancelled |
duke@435 | 600 | // (by a resume) before the actual suspend operation is completed. |
duke@435 | 601 | // Refresh our local copy to see if we still need to wait. |
duke@435 | 602 | pending = is_external_suspend(); |
duke@435 | 603 | } |
duke@435 | 604 | |
duke@435 | 605 | if (!pending) { |
duke@435 | 606 | // A cancelled suspend request is the only false return from |
duke@435 | 607 | // is_ext_suspend_completed() that keeps us from staying in the |
duke@435 | 608 | // retry loop. |
duke@435 | 609 | *bits |= 0x00080000; |
duke@435 | 610 | return false; |
duke@435 | 611 | } |
duke@435 | 612 | |
duke@435 | 613 | if (is_suspended) { |
duke@435 | 614 | *bits |= 0x00100000; |
duke@435 | 615 | return true; |
duke@435 | 616 | } |
duke@435 | 617 | } // end retry loop |
duke@435 | 618 | |
duke@435 | 619 | // thread did not suspend after all our retries |
duke@435 | 620 | *bits |= 0x00200000; |
duke@435 | 621 | return false; |
duke@435 | 622 | } |
duke@435 | 623 | |
duke@435 | 624 | #ifndef PRODUCT |
duke@435 | 625 | void JavaThread::record_jump(address target, address instr, const char* file, int line) { |
duke@435 | 626 | |
duke@435 | 627 | // This should not need to be atomic as the only way for simultaneous |
duke@435 | 628 | // updates is via interrupts. Even then this should be rare or non-existant |
duke@435 | 629 | // and we don't care that much anyway. |
duke@435 | 630 | |
duke@435 | 631 | int index = _jmp_ring_index; |
duke@435 | 632 | _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); |
duke@435 | 633 | _jmp_ring[index]._target = (intptr_t) target; |
duke@435 | 634 | _jmp_ring[index]._instruction = (intptr_t) instr; |
duke@435 | 635 | _jmp_ring[index]._file = file; |
duke@435 | 636 | _jmp_ring[index]._line = line; |
duke@435 | 637 | } |
duke@435 | 638 | #endif /* PRODUCT */ |
duke@435 | 639 | |
duke@435 | 640 | // Called by flat profiler |
duke@435 | 641 | // Callers have already called wait_for_ext_suspend_completion |
duke@435 | 642 | // The assertion for that is currently too complex to put here: |
duke@435 | 643 | bool JavaThread::profile_last_Java_frame(frame* _fr) { |
duke@435 | 644 | bool gotframe = false; |
duke@435 | 645 | // self suspension saves needed state. |
duke@435 | 646 | if (has_last_Java_frame() && _anchor.walkable()) { |
duke@435 | 647 | *_fr = pd_last_frame(); |
duke@435 | 648 | gotframe = true; |
duke@435 | 649 | } |
duke@435 | 650 | return gotframe; |
duke@435 | 651 | } |
duke@435 | 652 | |
duke@435 | 653 | void Thread::interrupt(Thread* thread) { |
duke@435 | 654 | trace("interrupt", thread); |
duke@435 | 655 | debug_only(check_for_dangling_thread_pointer(thread);) |
duke@435 | 656 | os::interrupt(thread); |
duke@435 | 657 | } |
duke@435 | 658 | |
duke@435 | 659 | bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { |
duke@435 | 660 | trace("is_interrupted", thread); |
duke@435 | 661 | debug_only(check_for_dangling_thread_pointer(thread);) |
duke@435 | 662 | // Note: If clear_interrupted==false, this simply fetches and |
duke@435 | 663 | // returns the value of the field osthread()->interrupted(). |
duke@435 | 664 | return os::is_interrupted(thread, clear_interrupted); |
duke@435 | 665 | } |
duke@435 | 666 | |
duke@435 | 667 | |
duke@435 | 668 | // GC Support |
duke@435 | 669 | bool Thread::claim_oops_do_par_case(int strong_roots_parity) { |
duke@435 | 670 | jint thread_parity = _oops_do_parity; |
duke@435 | 671 | if (thread_parity != strong_roots_parity) { |
duke@435 | 672 | jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); |
duke@435 | 673 | if (res == thread_parity) return true; |
duke@435 | 674 | else { |
duke@435 | 675 | guarantee(res == strong_roots_parity, "Or else what?"); |
duke@435 | 676 | assert(SharedHeap::heap()->n_par_threads() > 0, |
duke@435 | 677 | "Should only fail when parallel."); |
duke@435 | 678 | return false; |
duke@435 | 679 | } |
duke@435 | 680 | } |
duke@435 | 681 | assert(SharedHeap::heap()->n_par_threads() > 0, |
duke@435 | 682 | "Should only fail when parallel."); |
duke@435 | 683 | return false; |
duke@435 | 684 | } |
duke@435 | 685 | |
duke@435 | 686 | void Thread::oops_do(OopClosure* f) { |
duke@435 | 687 | active_handles()->oops_do(f); |
duke@435 | 688 | // Do oop for ThreadShadow |
duke@435 | 689 | f->do_oop((oop*)&_pending_exception); |
duke@435 | 690 | handle_area()->oops_do(f); |
duke@435 | 691 | } |
duke@435 | 692 | |
duke@435 | 693 | void Thread::nmethods_do() { |
duke@435 | 694 | } |
duke@435 | 695 | |
duke@435 | 696 | void Thread::print_on(outputStream* st) const { |
duke@435 | 697 | // get_priority assumes osthread initialized |
duke@435 | 698 | if (osthread() != NULL) { |
duke@435 | 699 | st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); |
duke@435 | 700 | osthread()->print_on(st); |
duke@435 | 701 | } |
duke@435 | 702 | debug_only(if (WizardMode) print_owned_locks_on(st);) |
duke@435 | 703 | } |
duke@435 | 704 | |
duke@435 | 705 | // Thread::print_on_error() is called by fatal error handler. Don't use |
duke@435 | 706 | // any lock or allocate memory. |
duke@435 | 707 | void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { |
duke@435 | 708 | if (is_VM_thread()) st->print("VMThread"); |
duke@435 | 709 | else if (is_Compiler_thread()) st->print("CompilerThread"); |
duke@435 | 710 | else if (is_Java_thread()) st->print("JavaThread"); |
duke@435 | 711 | else if (is_GC_task_thread()) st->print("GCTaskThread"); |
duke@435 | 712 | else if (is_Watcher_thread()) st->print("WatcherThread"); |
duke@435 | 713 | else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); |
duke@435 | 714 | else st->print("Thread"); |
duke@435 | 715 | |
duke@435 | 716 | st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", |
duke@435 | 717 | _stack_base - _stack_size, _stack_base); |
duke@435 | 718 | |
duke@435 | 719 | if (osthread()) { |
duke@435 | 720 | st->print(" [id=%d]", osthread()->thread_id()); |
duke@435 | 721 | } |
duke@435 | 722 | } |
duke@435 | 723 | |
duke@435 | 724 | #ifdef ASSERT |
duke@435 | 725 | void Thread::print_owned_locks_on(outputStream* st) const { |
duke@435 | 726 | Monitor *cur = _owned_locks; |
duke@435 | 727 | if (cur == NULL) { |
duke@435 | 728 | st->print(" (no locks) "); |
duke@435 | 729 | } else { |
duke@435 | 730 | st->print_cr(" Locks owned:"); |
duke@435 | 731 | while(cur) { |
duke@435 | 732 | cur->print_on(st); |
duke@435 | 733 | cur = cur->next(); |
duke@435 | 734 | } |
duke@435 | 735 | } |
duke@435 | 736 | } |
duke@435 | 737 | |
duke@435 | 738 | static int ref_use_count = 0; |
duke@435 | 739 | |
duke@435 | 740 | bool Thread::owns_locks_but_compiled_lock() const { |
duke@435 | 741 | for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { |
duke@435 | 742 | if (cur != Compile_lock) return true; |
duke@435 | 743 | } |
duke@435 | 744 | return false; |
duke@435 | 745 | } |
duke@435 | 746 | |
duke@435 | 747 | |
duke@435 | 748 | #endif |
duke@435 | 749 | |
duke@435 | 750 | #ifndef PRODUCT |
duke@435 | 751 | |
duke@435 | 752 | // The flag: potential_vm_operation notifies if this particular safepoint state could potential |
duke@435 | 753 | // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that |
duke@435 | 754 | // no threads which allow_vm_block's are held |
duke@435 | 755 | void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { |
duke@435 | 756 | // Check if current thread is allowed to block at a safepoint |
duke@435 | 757 | if (!(_allow_safepoint_count == 0)) |
duke@435 | 758 | fatal("Possible safepoint reached by thread that does not allow it"); |
duke@435 | 759 | if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { |
duke@435 | 760 | fatal("LEAF method calling lock?"); |
duke@435 | 761 | } |
duke@435 | 762 | |
duke@435 | 763 | #ifdef ASSERT |
duke@435 | 764 | if (potential_vm_operation && is_Java_thread() |
duke@435 | 765 | && !Universe::is_bootstrapping()) { |
duke@435 | 766 | // Make sure we do not hold any locks that the VM thread also uses. |
duke@435 | 767 | // This could potentially lead to deadlocks |
duke@435 | 768 | for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { |
duke@435 | 769 | // Threads_lock is special, since the safepoint synchronization will not start before this is |
duke@435 | 770 | // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, |
duke@435 | 771 | // since it is used to transfer control between JavaThreads and the VMThread |
duke@435 | 772 | // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! |
duke@435 | 773 | if ( (cur->allow_vm_block() && |
duke@435 | 774 | cur != Threads_lock && |
duke@435 | 775 | cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation |
duke@435 | 776 | cur != VMOperationRequest_lock && |
duke@435 | 777 | cur != VMOperationQueue_lock) || |
duke@435 | 778 | cur->rank() == Mutex::special) { |
duke@435 | 779 | warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); |
duke@435 | 780 | } |
duke@435 | 781 | } |
duke@435 | 782 | } |
duke@435 | 783 | |
duke@435 | 784 | if (GCALotAtAllSafepoints) { |
duke@435 | 785 | // We could enter a safepoint here and thus have a gc |
duke@435 | 786 | InterfaceSupport::check_gc_alot(); |
duke@435 | 787 | } |
duke@435 | 788 | |
duke@435 | 789 | #endif |
duke@435 | 790 | } |
duke@435 | 791 | #endif |
duke@435 | 792 | |
duke@435 | 793 | bool Thread::lock_is_in_stack(address adr) const { |
duke@435 | 794 | assert(Thread::current() == this, "lock_is_in_stack can only be called from current thread"); |
duke@435 | 795 | // High limit: highest_lock is set during thread execution |
duke@435 | 796 | // Low limit: address of the local variable dummy, rounded to 4K boundary. |
duke@435 | 797 | // (The rounding helps finding threads in unsafe mode, even if the particular stack |
duke@435 | 798 | // frame has been popped already. Correct as long as stacks are at least 4K long and aligned.) |
duke@435 | 799 | address end = os::current_stack_pointer(); |
duke@435 | 800 | if (_highest_lock >= adr && adr >= end) return true; |
duke@435 | 801 | |
duke@435 | 802 | return false; |
duke@435 | 803 | } |
duke@435 | 804 | |
duke@435 | 805 | |
duke@435 | 806 | bool Thread::is_in_stack(address adr) const { |
duke@435 | 807 | assert(Thread::current() == this, "is_in_stack can only be called from current thread"); |
duke@435 | 808 | address end = os::current_stack_pointer(); |
duke@435 | 809 | if (stack_base() >= adr && adr >= end) return true; |
duke@435 | 810 | |
duke@435 | 811 | return false; |
duke@435 | 812 | } |
duke@435 | 813 | |
duke@435 | 814 | |
duke@435 | 815 | // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
duke@435 | 816 | // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being |
duke@435 | 817 | // used for compilation in the future. If that change is made, the need for these methods |
duke@435 | 818 | // should be revisited, and they should be removed if possible. |
duke@435 | 819 | |
duke@435 | 820 | bool Thread::is_lock_owned(address adr) const { |
duke@435 | 821 | if (lock_is_in_stack(adr) ) return true; |
duke@435 | 822 | return false; |
duke@435 | 823 | } |
duke@435 | 824 | |
duke@435 | 825 | bool Thread::set_as_starting_thread() { |
duke@435 | 826 | // NOTE: this must be called inside the main thread. |
duke@435 | 827 | return os::create_main_thread((JavaThread*)this); |
duke@435 | 828 | } |
duke@435 | 829 | |
duke@435 | 830 | static void initialize_class(symbolHandle class_name, TRAPS) { |
duke@435 | 831 | klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
duke@435 | 832 | instanceKlass::cast(klass)->initialize(CHECK); |
duke@435 | 833 | } |
duke@435 | 834 | |
duke@435 | 835 | |
duke@435 | 836 | // Creates the initial ThreadGroup |
duke@435 | 837 | static Handle create_initial_thread_group(TRAPS) { |
duke@435 | 838 | klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH); |
duke@435 | 839 | instanceKlassHandle klass (THREAD, k); |
duke@435 | 840 | |
duke@435 | 841 | Handle system_instance = klass->allocate_instance_handle(CHECK_NH); |
duke@435 | 842 | { |
duke@435 | 843 | JavaValue result(T_VOID); |
duke@435 | 844 | JavaCalls::call_special(&result, |
duke@435 | 845 | system_instance, |
duke@435 | 846 | klass, |
duke@435 | 847 | vmSymbolHandles::object_initializer_name(), |
duke@435 | 848 | vmSymbolHandles::void_method_signature(), |
duke@435 | 849 | CHECK_NH); |
duke@435 | 850 | } |
duke@435 | 851 | Universe::set_system_thread_group(system_instance()); |
duke@435 | 852 | |
duke@435 | 853 | Handle main_instance = klass->allocate_instance_handle(CHECK_NH); |
duke@435 | 854 | { |
duke@435 | 855 | JavaValue result(T_VOID); |
duke@435 | 856 | Handle string = java_lang_String::create_from_str("main", CHECK_NH); |
duke@435 | 857 | JavaCalls::call_special(&result, |
duke@435 | 858 | main_instance, |
duke@435 | 859 | klass, |
duke@435 | 860 | vmSymbolHandles::object_initializer_name(), |
duke@435 | 861 | vmSymbolHandles::threadgroup_string_void_signature(), |
duke@435 | 862 | system_instance, |
duke@435 | 863 | string, |
duke@435 | 864 | CHECK_NH); |
duke@435 | 865 | } |
duke@435 | 866 | return main_instance; |
duke@435 | 867 | } |
duke@435 | 868 | |
duke@435 | 869 | // Creates the initial Thread |
duke@435 | 870 | static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { |
duke@435 | 871 | klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL); |
duke@435 | 872 | instanceKlassHandle klass (THREAD, k); |
duke@435 | 873 | instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); |
duke@435 | 874 | |
duke@435 | 875 | java_lang_Thread::set_thread(thread_oop(), thread); |
duke@435 | 876 | java_lang_Thread::set_priority(thread_oop(), NormPriority); |
duke@435 | 877 | thread->set_threadObj(thread_oop()); |
duke@435 | 878 | |
duke@435 | 879 | Handle string = java_lang_String::create_from_str("main", CHECK_NULL); |
duke@435 | 880 | |
duke@435 | 881 | JavaValue result(T_VOID); |
duke@435 | 882 | JavaCalls::call_special(&result, thread_oop, |
duke@435 | 883 | klass, |
duke@435 | 884 | vmSymbolHandles::object_initializer_name(), |
duke@435 | 885 | vmSymbolHandles::threadgroup_string_void_signature(), |
duke@435 | 886 | thread_group, |
duke@435 | 887 | string, |
duke@435 | 888 | CHECK_NULL); |
duke@435 | 889 | return thread_oop(); |
duke@435 | 890 | } |
duke@435 | 891 | |
duke@435 | 892 | static void call_initializeSystemClass(TRAPS) { |
duke@435 | 893 | klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); |
duke@435 | 894 | instanceKlassHandle klass (THREAD, k); |
duke@435 | 895 | |
duke@435 | 896 | JavaValue result(T_VOID); |
duke@435 | 897 | JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(), |
duke@435 | 898 | vmSymbolHandles::void_method_signature(), CHECK); |
duke@435 | 899 | } |
duke@435 | 900 | |
duke@435 | 901 | static void reset_vm_info_property(TRAPS) { |
duke@435 | 902 | // the vm info string |
duke@435 | 903 | ResourceMark rm(THREAD); |
duke@435 | 904 | const char *vm_info = VM_Version::vm_info_string(); |
duke@435 | 905 | |
duke@435 | 906 | // java.lang.System class |
duke@435 | 907 | klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); |
duke@435 | 908 | instanceKlassHandle klass (THREAD, k); |
duke@435 | 909 | |
duke@435 | 910 | // setProperty arguments |
duke@435 | 911 | Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); |
duke@435 | 912 | Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); |
duke@435 | 913 | |
duke@435 | 914 | // return value |
duke@435 | 915 | JavaValue r(T_OBJECT); |
duke@435 | 916 | |
duke@435 | 917 | // public static String setProperty(String key, String value); |
duke@435 | 918 | JavaCalls::call_static(&r, |
duke@435 | 919 | klass, |
duke@435 | 920 | vmSymbolHandles::setProperty_name(), |
duke@435 | 921 | vmSymbolHandles::string_string_string_signature(), |
duke@435 | 922 | key_str, |
duke@435 | 923 | value_str, |
duke@435 | 924 | CHECK); |
duke@435 | 925 | } |
duke@435 | 926 | |
duke@435 | 927 | |
duke@435 | 928 | void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { |
duke@435 | 929 | assert(thread_group.not_null(), "thread group should be specified"); |
duke@435 | 930 | assert(threadObj() == NULL, "should only create Java thread object once"); |
duke@435 | 931 | |
duke@435 | 932 | klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); |
duke@435 | 933 | instanceKlassHandle klass (THREAD, k); |
duke@435 | 934 | instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); |
duke@435 | 935 | |
duke@435 | 936 | java_lang_Thread::set_thread(thread_oop(), this); |
duke@435 | 937 | java_lang_Thread::set_priority(thread_oop(), NormPriority); |
duke@435 | 938 | set_threadObj(thread_oop()); |
duke@435 | 939 | |
duke@435 | 940 | JavaValue result(T_VOID); |
duke@435 | 941 | if (thread_name != NULL) { |
duke@435 | 942 | Handle name = java_lang_String::create_from_str(thread_name, CHECK); |
duke@435 | 943 | // Thread gets assigned specified name and null target |
duke@435 | 944 | JavaCalls::call_special(&result, |
duke@435 | 945 | thread_oop, |
duke@435 | 946 | klass, |
duke@435 | 947 | vmSymbolHandles::object_initializer_name(), |
duke@435 | 948 | vmSymbolHandles::threadgroup_string_void_signature(), |
duke@435 | 949 | thread_group, // Argument 1 |
duke@435 | 950 | name, // Argument 2 |
duke@435 | 951 | THREAD); |
duke@435 | 952 | } else { |
duke@435 | 953 | // Thread gets assigned name "Thread-nnn" and null target |
duke@435 | 954 | // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) |
duke@435 | 955 | JavaCalls::call_special(&result, |
duke@435 | 956 | thread_oop, |
duke@435 | 957 | klass, |
duke@435 | 958 | vmSymbolHandles::object_initializer_name(), |
duke@435 | 959 | vmSymbolHandles::threadgroup_runnable_void_signature(), |
duke@435 | 960 | thread_group, // Argument 1 |
duke@435 | 961 | Handle(), // Argument 2 |
duke@435 | 962 | THREAD); |
duke@435 | 963 | } |
duke@435 | 964 | |
duke@435 | 965 | |
duke@435 | 966 | if (daemon) { |
duke@435 | 967 | java_lang_Thread::set_daemon(thread_oop()); |
duke@435 | 968 | } |
duke@435 | 969 | |
duke@435 | 970 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 971 | return; |
duke@435 | 972 | } |
duke@435 | 973 | |
duke@435 | 974 | KlassHandle group(this, SystemDictionary::threadGroup_klass()); |
duke@435 | 975 | Handle threadObj(this, this->threadObj()); |
duke@435 | 976 | |
duke@435 | 977 | JavaCalls::call_special(&result, |
duke@435 | 978 | thread_group, |
duke@435 | 979 | group, |
duke@435 | 980 | vmSymbolHandles::add_method_name(), |
duke@435 | 981 | vmSymbolHandles::thread_void_signature(), |
duke@435 | 982 | threadObj, // Arg 1 |
duke@435 | 983 | THREAD); |
duke@435 | 984 | |
duke@435 | 985 | |
duke@435 | 986 | } |
duke@435 | 987 | |
duke@435 | 988 | // NamedThread -- non-JavaThread subclasses with multiple |
duke@435 | 989 | // uniquely named instances should derive from this. |
duke@435 | 990 | NamedThread::NamedThread() : Thread() { |
duke@435 | 991 | _name = NULL; |
duke@435 | 992 | } |
duke@435 | 993 | |
duke@435 | 994 | NamedThread::~NamedThread() { |
duke@435 | 995 | if (_name != NULL) { |
duke@435 | 996 | FREE_C_HEAP_ARRAY(char, _name); |
duke@435 | 997 | _name = NULL; |
duke@435 | 998 | } |
duke@435 | 999 | } |
duke@435 | 1000 | |
duke@435 | 1001 | void NamedThread::set_name(const char* format, ...) { |
duke@435 | 1002 | guarantee(_name == NULL, "Only get to set name once."); |
duke@435 | 1003 | _name = NEW_C_HEAP_ARRAY(char, max_name_len); |
duke@435 | 1004 | guarantee(_name != NULL, "alloc failure"); |
duke@435 | 1005 | va_list ap; |
duke@435 | 1006 | va_start(ap, format); |
duke@435 | 1007 | jio_vsnprintf(_name, max_name_len, format, ap); |
duke@435 | 1008 | va_end(ap); |
duke@435 | 1009 | } |
duke@435 | 1010 | |
duke@435 | 1011 | // ======= WatcherThread ======== |
duke@435 | 1012 | |
duke@435 | 1013 | // The watcher thread exists to simulate timer interrupts. It should |
duke@435 | 1014 | // be replaced by an abstraction over whatever native support for |
duke@435 | 1015 | // timer interrupts exists on the platform. |
duke@435 | 1016 | |
duke@435 | 1017 | WatcherThread* WatcherThread::_watcher_thread = NULL; |
duke@435 | 1018 | bool WatcherThread::_should_terminate = false; |
duke@435 | 1019 | |
duke@435 | 1020 | WatcherThread::WatcherThread() : Thread() { |
duke@435 | 1021 | assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
duke@435 | 1022 | if (os::create_thread(this, os::watcher_thread)) { |
duke@435 | 1023 | _watcher_thread = this; |
duke@435 | 1024 | |
duke@435 | 1025 | // Set the watcher thread to the highest OS priority which should not be |
duke@435 | 1026 | // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY |
duke@435 | 1027 | // is created. The only normal thread using this priority is the reference |
duke@435 | 1028 | // handler thread, which runs for very short intervals only. |
duke@435 | 1029 | // If the VMThread's priority is not lower than the WatcherThread profiling |
duke@435 | 1030 | // will be inaccurate. |
duke@435 | 1031 | os::set_priority(this, MaxPriority); |
duke@435 | 1032 | if (!DisableStartThread) { |
duke@435 | 1033 | os::start_thread(this); |
duke@435 | 1034 | } |
duke@435 | 1035 | } |
duke@435 | 1036 | } |
duke@435 | 1037 | |
duke@435 | 1038 | void WatcherThread::run() { |
duke@435 | 1039 | assert(this == watcher_thread(), "just checking"); |
duke@435 | 1040 | |
duke@435 | 1041 | this->record_stack_base_and_size(); |
duke@435 | 1042 | this->initialize_thread_local_storage(); |
duke@435 | 1043 | this->set_active_handles(JNIHandleBlock::allocate_block()); |
duke@435 | 1044 | while(!_should_terminate) { |
duke@435 | 1045 | assert(watcher_thread() == Thread::current(), "thread consistency check"); |
duke@435 | 1046 | assert(watcher_thread() == this, "thread consistency check"); |
duke@435 | 1047 | |
duke@435 | 1048 | // Calculate how long it'll be until the next PeriodicTask work |
duke@435 | 1049 | // should be done, and sleep that amount of time. |
duke@435 | 1050 | const size_t time_to_wait = PeriodicTask::time_to_wait(); |
duke@435 | 1051 | os::sleep(this, time_to_wait, false); |
duke@435 | 1052 | |
duke@435 | 1053 | if (is_error_reported()) { |
duke@435 | 1054 | // A fatal error has happened, the error handler(VMError::report_and_die) |
duke@435 | 1055 | // should abort JVM after creating an error log file. However in some |
duke@435 | 1056 | // rare cases, the error handler itself might deadlock. Here we try to |
duke@435 | 1057 | // kill JVM if the fatal error handler fails to abort in 2 minutes. |
duke@435 | 1058 | // |
duke@435 | 1059 | // This code is in WatcherThread because WatcherThread wakes up |
duke@435 | 1060 | // periodically so the fatal error handler doesn't need to do anything; |
duke@435 | 1061 | // also because the WatcherThread is less likely to crash than other |
duke@435 | 1062 | // threads. |
duke@435 | 1063 | |
duke@435 | 1064 | for (;;) { |
duke@435 | 1065 | if (!ShowMessageBoxOnError |
duke@435 | 1066 | && (OnError == NULL || OnError[0] == '\0') |
duke@435 | 1067 | && Arguments::abort_hook() == NULL) { |
duke@435 | 1068 | os::sleep(this, 2 * 60 * 1000, false); |
duke@435 | 1069 | fdStream err(defaultStream::output_fd()); |
duke@435 | 1070 | err.print_raw_cr("# [ timer expired, abort... ]"); |
duke@435 | 1071 | // skip atexit/vm_exit/vm_abort hooks |
duke@435 | 1072 | os::die(); |
duke@435 | 1073 | } |
duke@435 | 1074 | |
duke@435 | 1075 | // Wake up 5 seconds later, the fatal handler may reset OnError or |
duke@435 | 1076 | // ShowMessageBoxOnError when it is ready to abort. |
duke@435 | 1077 | os::sleep(this, 5 * 1000, false); |
duke@435 | 1078 | } |
duke@435 | 1079 | } |
duke@435 | 1080 | |
duke@435 | 1081 | PeriodicTask::real_time_tick(time_to_wait); |
duke@435 | 1082 | |
duke@435 | 1083 | // If we have no more tasks left due to dynamic disenrollment, |
duke@435 | 1084 | // shut down the thread since we don't currently support dynamic enrollment |
duke@435 | 1085 | if (PeriodicTask::num_tasks() == 0) { |
duke@435 | 1086 | _should_terminate = true; |
duke@435 | 1087 | } |
duke@435 | 1088 | } |
duke@435 | 1089 | |
duke@435 | 1090 | // Signal that it is terminated |
duke@435 | 1091 | { |
duke@435 | 1092 | MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); |
duke@435 | 1093 | _watcher_thread = NULL; |
duke@435 | 1094 | Terminator_lock->notify(); |
duke@435 | 1095 | } |
duke@435 | 1096 | |
duke@435 | 1097 | // Thread destructor usually does this.. |
duke@435 | 1098 | ThreadLocalStorage::set_thread(NULL); |
duke@435 | 1099 | } |
duke@435 | 1100 | |
duke@435 | 1101 | void WatcherThread::start() { |
duke@435 | 1102 | if (watcher_thread() == NULL) { |
duke@435 | 1103 | _should_terminate = false; |
duke@435 | 1104 | // Create the single instance of WatcherThread |
duke@435 | 1105 | new WatcherThread(); |
duke@435 | 1106 | } |
duke@435 | 1107 | } |
duke@435 | 1108 | |
duke@435 | 1109 | void WatcherThread::stop() { |
duke@435 | 1110 | // it is ok to take late safepoints here, if needed |
duke@435 | 1111 | MutexLocker mu(Terminator_lock); |
duke@435 | 1112 | _should_terminate = true; |
duke@435 | 1113 | while(watcher_thread() != NULL) { |
duke@435 | 1114 | // This wait should make safepoint checks, wait without a timeout, |
duke@435 | 1115 | // and wait as a suspend-equivalent condition. |
duke@435 | 1116 | // |
duke@435 | 1117 | // Note: If the FlatProfiler is running, then this thread is waiting |
duke@435 | 1118 | // for the WatcherThread to terminate and the WatcherThread, via the |
duke@435 | 1119 | // FlatProfiler task, is waiting for the external suspend request on |
duke@435 | 1120 | // this thread to complete. wait_for_ext_suspend_completion() will |
duke@435 | 1121 | // eventually timeout, but that takes time. Making this wait a |
duke@435 | 1122 | // suspend-equivalent condition solves that timeout problem. |
duke@435 | 1123 | // |
duke@435 | 1124 | Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, |
duke@435 | 1125 | Mutex::_as_suspend_equivalent_flag); |
duke@435 | 1126 | } |
duke@435 | 1127 | } |
duke@435 | 1128 | |
duke@435 | 1129 | void WatcherThread::print_on(outputStream* st) const { |
duke@435 | 1130 | st->print("\"%s\" ", name()); |
duke@435 | 1131 | Thread::print_on(st); |
duke@435 | 1132 | st->cr(); |
duke@435 | 1133 | } |
duke@435 | 1134 | |
duke@435 | 1135 | // ======= JavaThread ======== |
duke@435 | 1136 | |
duke@435 | 1137 | // A JavaThread is a normal Java thread |
duke@435 | 1138 | |
duke@435 | 1139 | void JavaThread::initialize() { |
duke@435 | 1140 | // Initialize fields |
duke@435 | 1141 | set_saved_exception_pc(NULL); |
duke@435 | 1142 | set_threadObj(NULL); |
duke@435 | 1143 | _anchor.clear(); |
duke@435 | 1144 | set_entry_point(NULL); |
duke@435 | 1145 | set_jni_functions(jni_functions()); |
duke@435 | 1146 | set_callee_target(NULL); |
duke@435 | 1147 | set_vm_result(NULL); |
duke@435 | 1148 | set_vm_result_2(NULL); |
duke@435 | 1149 | set_vframe_array_head(NULL); |
duke@435 | 1150 | set_vframe_array_last(NULL); |
duke@435 | 1151 | set_deferred_locals(NULL); |
duke@435 | 1152 | set_deopt_mark(NULL); |
duke@435 | 1153 | clear_must_deopt_id(); |
duke@435 | 1154 | set_monitor_chunks(NULL); |
duke@435 | 1155 | set_next(NULL); |
duke@435 | 1156 | set_thread_state(_thread_new); |
duke@435 | 1157 | _terminated = _not_terminated; |
duke@435 | 1158 | _privileged_stack_top = NULL; |
duke@435 | 1159 | _array_for_gc = NULL; |
duke@435 | 1160 | _suspend_equivalent = false; |
duke@435 | 1161 | _in_deopt_handler = 0; |
duke@435 | 1162 | _doing_unsafe_access = false; |
duke@435 | 1163 | _stack_guard_state = stack_guard_unused; |
duke@435 | 1164 | _exception_oop = NULL; |
duke@435 | 1165 | _exception_pc = 0; |
duke@435 | 1166 | _exception_handler_pc = 0; |
duke@435 | 1167 | _exception_stack_size = 0; |
duke@435 | 1168 | _jvmti_thread_state= NULL; |
duke@435 | 1169 | _jvmti_get_loaded_classes_closure = NULL; |
duke@435 | 1170 | _interp_only_mode = 0; |
duke@435 | 1171 | _special_runtime_exit_condition = _no_async_condition; |
duke@435 | 1172 | _pending_async_exception = NULL; |
duke@435 | 1173 | _is_compiling = false; |
duke@435 | 1174 | _thread_stat = NULL; |
duke@435 | 1175 | _thread_stat = new ThreadStatistics(); |
duke@435 | 1176 | _blocked_on_compilation = false; |
duke@435 | 1177 | _jni_active_critical = 0; |
duke@435 | 1178 | _do_not_unlock_if_synchronized = false; |
duke@435 | 1179 | _cached_monitor_info = NULL; |
duke@435 | 1180 | _parker = Parker::Allocate(this) ; |
duke@435 | 1181 | |
duke@435 | 1182 | #ifndef PRODUCT |
duke@435 | 1183 | _jmp_ring_index = 0; |
duke@435 | 1184 | for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { |
duke@435 | 1185 | record_jump(NULL, NULL, NULL, 0); |
duke@435 | 1186 | } |
duke@435 | 1187 | #endif /* PRODUCT */ |
duke@435 | 1188 | |
duke@435 | 1189 | set_thread_profiler(NULL); |
duke@435 | 1190 | if (FlatProfiler::is_active()) { |
duke@435 | 1191 | // This is where we would decide to either give each thread it's own profiler |
duke@435 | 1192 | // or use one global one from FlatProfiler, |
duke@435 | 1193 | // or up to some count of the number of profiled threads, etc. |
duke@435 | 1194 | ThreadProfiler* pp = new ThreadProfiler(); |
duke@435 | 1195 | pp->engage(); |
duke@435 | 1196 | set_thread_profiler(pp); |
duke@435 | 1197 | } |
duke@435 | 1198 | |
duke@435 | 1199 | // Setup safepoint state info for this thread |
duke@435 | 1200 | ThreadSafepointState::create(this); |
duke@435 | 1201 | |
duke@435 | 1202 | debug_only(_java_call_counter = 0); |
duke@435 | 1203 | |
duke@435 | 1204 | // JVMTI PopFrame support |
duke@435 | 1205 | _popframe_condition = popframe_inactive; |
duke@435 | 1206 | _popframe_preserved_args = NULL; |
duke@435 | 1207 | _popframe_preserved_args_size = 0; |
duke@435 | 1208 | |
duke@435 | 1209 | pd_initialize(); |
duke@435 | 1210 | } |
duke@435 | 1211 | |
duke@435 | 1212 | JavaThread::JavaThread(bool is_attaching) : Thread() { |
duke@435 | 1213 | initialize(); |
duke@435 | 1214 | _is_attaching = is_attaching; |
duke@435 | 1215 | } |
duke@435 | 1216 | |
duke@435 | 1217 | bool JavaThread::reguard_stack(address cur_sp) { |
duke@435 | 1218 | if (_stack_guard_state != stack_guard_yellow_disabled) { |
duke@435 | 1219 | return true; // Stack already guarded or guard pages not needed. |
duke@435 | 1220 | } |
duke@435 | 1221 | |
duke@435 | 1222 | if (register_stack_overflow()) { |
duke@435 | 1223 | // For those architectures which have separate register and |
duke@435 | 1224 | // memory stacks, we must check the register stack to see if |
duke@435 | 1225 | // it has overflowed. |
duke@435 | 1226 | return false; |
duke@435 | 1227 | } |
duke@435 | 1228 | |
duke@435 | 1229 | // Java code never executes within the yellow zone: the latter is only |
duke@435 | 1230 | // there to provoke an exception during stack banging. If java code |
duke@435 | 1231 | // is executing there, either StackShadowPages should be larger, or |
duke@435 | 1232 | // some exception code in c1, c2 or the interpreter isn't unwinding |
duke@435 | 1233 | // when it should. |
duke@435 | 1234 | guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); |
duke@435 | 1235 | |
duke@435 | 1236 | enable_stack_yellow_zone(); |
duke@435 | 1237 | return true; |
duke@435 | 1238 | } |
duke@435 | 1239 | |
duke@435 | 1240 | bool JavaThread::reguard_stack(void) { |
duke@435 | 1241 | return reguard_stack(os::current_stack_pointer()); |
duke@435 | 1242 | } |
duke@435 | 1243 | |
duke@435 | 1244 | |
duke@435 | 1245 | void JavaThread::block_if_vm_exited() { |
duke@435 | 1246 | if (_terminated == _vm_exited) { |
duke@435 | 1247 | // _vm_exited is set at safepoint, and Threads_lock is never released |
duke@435 | 1248 | // we will block here forever |
duke@435 | 1249 | Threads_lock->lock_without_safepoint_check(); |
duke@435 | 1250 | ShouldNotReachHere(); |
duke@435 | 1251 | } |
duke@435 | 1252 | } |
duke@435 | 1253 | |
duke@435 | 1254 | |
duke@435 | 1255 | // Remove this ifdef when C1 is ported to the compiler interface. |
duke@435 | 1256 | static void compiler_thread_entry(JavaThread* thread, TRAPS); |
duke@435 | 1257 | |
duke@435 | 1258 | JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : Thread() { |
duke@435 | 1259 | if (TraceThreadEvents) { |
duke@435 | 1260 | tty->print_cr("creating thread %p", this); |
duke@435 | 1261 | } |
duke@435 | 1262 | initialize(); |
duke@435 | 1263 | _is_attaching = false; |
duke@435 | 1264 | set_entry_point(entry_point); |
duke@435 | 1265 | // Create the native thread itself. |
duke@435 | 1266 | // %note runtime_23 |
duke@435 | 1267 | os::ThreadType thr_type = os::java_thread; |
duke@435 | 1268 | thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : |
duke@435 | 1269 | os::java_thread; |
duke@435 | 1270 | os::create_thread(this, thr_type, stack_sz); |
duke@435 | 1271 | |
duke@435 | 1272 | // The _osthread may be NULL here because we ran out of memory (too many threads active). |
duke@435 | 1273 | // We need to throw and OutOfMemoryError - however we cannot do this here because the caller |
duke@435 | 1274 | // may hold a lock and all locks must be unlocked before throwing the exception (throwing |
duke@435 | 1275 | // the exception consists of creating the exception object & initializing it, initialization |
duke@435 | 1276 | // will leave the VM via a JavaCall and then all locks must be unlocked). |
duke@435 | 1277 | // |
duke@435 | 1278 | // The thread is still suspended when we reach here. Thread must be explicit started |
duke@435 | 1279 | // by creator! Furthermore, the thread must also explicitly be added to the Threads list |
duke@435 | 1280 | // by calling Threads:add. The reason why this is not done here, is because the thread |
duke@435 | 1281 | // object must be fully initialized (take a look at JVM_Start) |
duke@435 | 1282 | } |
duke@435 | 1283 | |
duke@435 | 1284 | JavaThread::~JavaThread() { |
duke@435 | 1285 | if (TraceThreadEvents) { |
duke@435 | 1286 | tty->print_cr("terminate thread %p", this); |
duke@435 | 1287 | } |
duke@435 | 1288 | |
duke@435 | 1289 | // JSR166 -- return the parker to the free list |
duke@435 | 1290 | Parker::Release(_parker); |
duke@435 | 1291 | _parker = NULL ; |
duke@435 | 1292 | |
duke@435 | 1293 | // Free any remaining previous UnrollBlock |
duke@435 | 1294 | vframeArray* old_array = vframe_array_last(); |
duke@435 | 1295 | |
duke@435 | 1296 | if (old_array != NULL) { |
duke@435 | 1297 | Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); |
duke@435 | 1298 | old_array->set_unroll_block(NULL); |
duke@435 | 1299 | delete old_info; |
duke@435 | 1300 | delete old_array; |
duke@435 | 1301 | } |
duke@435 | 1302 | |
duke@435 | 1303 | GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); |
duke@435 | 1304 | if (deferred != NULL) { |
duke@435 | 1305 | // This can only happen if thread is destroyed before deoptimization occurs. |
duke@435 | 1306 | assert(deferred->length() != 0, "empty array!"); |
duke@435 | 1307 | do { |
duke@435 | 1308 | jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); |
duke@435 | 1309 | deferred->remove_at(0); |
duke@435 | 1310 | // individual jvmtiDeferredLocalVariableSet are CHeapObj's |
duke@435 | 1311 | delete dlv; |
duke@435 | 1312 | } while (deferred->length() != 0); |
duke@435 | 1313 | delete deferred; |
duke@435 | 1314 | } |
duke@435 | 1315 | |
duke@435 | 1316 | // All Java related clean up happens in exit |
duke@435 | 1317 | ThreadSafepointState::destroy(this); |
duke@435 | 1318 | if (_thread_profiler != NULL) delete _thread_profiler; |
duke@435 | 1319 | if (_thread_stat != NULL) delete _thread_stat; |
duke@435 | 1320 | |
duke@435 | 1321 | if (jvmti_thread_state() != NULL) { |
duke@435 | 1322 | JvmtiExport::cleanup_thread(this); |
duke@435 | 1323 | } |
duke@435 | 1324 | } |
duke@435 | 1325 | |
duke@435 | 1326 | |
duke@435 | 1327 | // The first routine called by a new Java thread |
duke@435 | 1328 | void JavaThread::run() { |
duke@435 | 1329 | // initialize thread-local alloc buffer related fields |
duke@435 | 1330 | this->initialize_tlab(); |
duke@435 | 1331 | |
duke@435 | 1332 | // used to test validitity of stack trace backs |
duke@435 | 1333 | this->record_base_of_stack_pointer(); |
duke@435 | 1334 | |
duke@435 | 1335 | // Record real stack base and size. |
duke@435 | 1336 | this->record_stack_base_and_size(); |
duke@435 | 1337 | |
duke@435 | 1338 | // Initialize thread local storage; set before calling MutexLocker |
duke@435 | 1339 | this->initialize_thread_local_storage(); |
duke@435 | 1340 | |
duke@435 | 1341 | this->create_stack_guard_pages(); |
duke@435 | 1342 | |
duke@435 | 1343 | // Thread is now sufficient initialized to be handled by the safepoint code as being |
duke@435 | 1344 | // in the VM. Change thread state from _thread_new to _thread_in_vm |
duke@435 | 1345 | ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); |
duke@435 | 1346 | |
duke@435 | 1347 | assert(JavaThread::current() == this, "sanity check"); |
duke@435 | 1348 | assert(!Thread::current()->owns_locks(), "sanity check"); |
duke@435 | 1349 | |
duke@435 | 1350 | DTRACE_THREAD_PROBE(start, this); |
duke@435 | 1351 | |
duke@435 | 1352 | // This operation might block. We call that after all safepoint checks for a new thread has |
duke@435 | 1353 | // been completed. |
duke@435 | 1354 | this->set_active_handles(JNIHandleBlock::allocate_block()); |
duke@435 | 1355 | |
duke@435 | 1356 | if (JvmtiExport::should_post_thread_life()) { |
duke@435 | 1357 | JvmtiExport::post_thread_start(this); |
duke@435 | 1358 | } |
duke@435 | 1359 | |
duke@435 | 1360 | // We call another function to do the rest so we are sure that the stack addresses used |
duke@435 | 1361 | // from there will be lower than the stack base just computed |
duke@435 | 1362 | thread_main_inner(); |
duke@435 | 1363 | |
duke@435 | 1364 | // Note, thread is no longer valid at this point! |
duke@435 | 1365 | } |
duke@435 | 1366 | |
duke@435 | 1367 | |
duke@435 | 1368 | void JavaThread::thread_main_inner() { |
duke@435 | 1369 | assert(JavaThread::current() == this, "sanity check"); |
duke@435 | 1370 | assert(this->threadObj() != NULL, "just checking"); |
duke@435 | 1371 | |
duke@435 | 1372 | // Execute thread entry point. If this thread is being asked to restart, |
duke@435 | 1373 | // or has been stopped before starting, do not reexecute entry point. |
duke@435 | 1374 | // Note: Due to JVM_StopThread we can have pending exceptions already! |
duke@435 | 1375 | if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) { |
duke@435 | 1376 | // enter the thread's entry point only if we have no pending exceptions |
duke@435 | 1377 | HandleMark hm(this); |
duke@435 | 1378 | this->entry_point()(this, this); |
duke@435 | 1379 | } |
duke@435 | 1380 | |
duke@435 | 1381 | DTRACE_THREAD_PROBE(stop, this); |
duke@435 | 1382 | |
duke@435 | 1383 | this->exit(false); |
duke@435 | 1384 | delete this; |
duke@435 | 1385 | } |
duke@435 | 1386 | |
duke@435 | 1387 | |
duke@435 | 1388 | static void ensure_join(JavaThread* thread) { |
duke@435 | 1389 | // We do not need to grap the Threads_lock, since we are operating on ourself. |
duke@435 | 1390 | Handle threadObj(thread, thread->threadObj()); |
duke@435 | 1391 | assert(threadObj.not_null(), "java thread object must exist"); |
duke@435 | 1392 | ObjectLocker lock(threadObj, thread); |
duke@435 | 1393 | // Ignore pending exception (ThreadDeath), since we are exiting anyway |
duke@435 | 1394 | thread->clear_pending_exception(); |
duke@435 | 1395 | // It is of profound importance that we set the stillborn bit and reset the thread object, |
duke@435 | 1396 | // before we do the notify. Since, changing these two variable will make JVM_IsAlive return |
duke@435 | 1397 | // false. So in case another thread is doing a join on this thread , it will detect that the thread |
duke@435 | 1398 | // is dead when it gets notified. |
duke@435 | 1399 | java_lang_Thread::set_stillborn(threadObj()); |
duke@435 | 1400 | // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. |
duke@435 | 1401 | java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); |
duke@435 | 1402 | java_lang_Thread::set_thread(threadObj(), NULL); |
duke@435 | 1403 | lock.notify_all(thread); |
duke@435 | 1404 | // Ignore pending exception (ThreadDeath), since we are exiting anyway |
duke@435 | 1405 | thread->clear_pending_exception(); |
duke@435 | 1406 | } |
duke@435 | 1407 | |
duke@435 | 1408 | // For any new cleanup additions, please check to see if they need to be applied to |
duke@435 | 1409 | // cleanup_failed_attach_current_thread as well. |
duke@435 | 1410 | void JavaThread::exit(bool destroy_vm, ExitType exit_type) { |
duke@435 | 1411 | assert(this == JavaThread::current(), "thread consistency check"); |
duke@435 | 1412 | if (!InitializeJavaLangSystem) return; |
duke@435 | 1413 | |
duke@435 | 1414 | HandleMark hm(this); |
duke@435 | 1415 | Handle uncaught_exception(this, this->pending_exception()); |
duke@435 | 1416 | this->clear_pending_exception(); |
duke@435 | 1417 | Handle threadObj(this, this->threadObj()); |
duke@435 | 1418 | assert(threadObj.not_null(), "Java thread object should be created"); |
duke@435 | 1419 | |
duke@435 | 1420 | if (get_thread_profiler() != NULL) { |
duke@435 | 1421 | get_thread_profiler()->disengage(); |
duke@435 | 1422 | ResourceMark rm; |
duke@435 | 1423 | get_thread_profiler()->print(get_thread_name()); |
duke@435 | 1424 | } |
duke@435 | 1425 | |
duke@435 | 1426 | |
duke@435 | 1427 | // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place |
duke@435 | 1428 | { |
duke@435 | 1429 | EXCEPTION_MARK; |
duke@435 | 1430 | |
duke@435 | 1431 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 1432 | } |
duke@435 | 1433 | // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This |
duke@435 | 1434 | // has to be fixed by a runtime query method |
duke@435 | 1435 | if (!destroy_vm || JDK_Version::is_jdk12x_version()) { |
duke@435 | 1436 | // JSR-166: change call from from ThreadGroup.uncaughtException to |
duke@435 | 1437 | // java.lang.Thread.dispatchUncaughtException |
duke@435 | 1438 | if (uncaught_exception.not_null()) { |
duke@435 | 1439 | Handle group(this, java_lang_Thread::threadGroup(threadObj())); |
duke@435 | 1440 | Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", |
duke@435 | 1441 | (address)uncaught_exception(), (address)threadObj(), (address)group()); |
duke@435 | 1442 | { |
duke@435 | 1443 | EXCEPTION_MARK; |
duke@435 | 1444 | // Check if the method Thread.dispatchUncaughtException() exists. If so |
duke@435 | 1445 | // call it. Otherwise we have an older library without the JSR-166 changes, |
duke@435 | 1446 | // so call ThreadGroup.uncaughtException() |
duke@435 | 1447 | KlassHandle recvrKlass(THREAD, threadObj->klass()); |
duke@435 | 1448 | CallInfo callinfo; |
duke@435 | 1449 | KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); |
duke@435 | 1450 | LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
duke@435 | 1451 | vmSymbolHandles::dispatchUncaughtException_name(), |
duke@435 | 1452 | vmSymbolHandles::throwable_void_signature(), |
duke@435 | 1453 | KlassHandle(), false, false, THREAD); |
duke@435 | 1454 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 1455 | methodHandle method = callinfo.selected_method(); |
duke@435 | 1456 | if (method.not_null()) { |
duke@435 | 1457 | JavaValue result(T_VOID); |
duke@435 | 1458 | JavaCalls::call_virtual(&result, |
duke@435 | 1459 | threadObj, thread_klass, |
duke@435 | 1460 | vmSymbolHandles::dispatchUncaughtException_name(), |
duke@435 | 1461 | vmSymbolHandles::throwable_void_signature(), |
duke@435 | 1462 | uncaught_exception, |
duke@435 | 1463 | THREAD); |
duke@435 | 1464 | } else { |
duke@435 | 1465 | KlassHandle thread_group(THREAD, SystemDictionary::threadGroup_klass()); |
duke@435 | 1466 | JavaValue result(T_VOID); |
duke@435 | 1467 | JavaCalls::call_virtual(&result, |
duke@435 | 1468 | group, thread_group, |
duke@435 | 1469 | vmSymbolHandles::uncaughtException_name(), |
duke@435 | 1470 | vmSymbolHandles::thread_throwable_void_signature(), |
duke@435 | 1471 | threadObj, // Arg 1 |
duke@435 | 1472 | uncaught_exception, // Arg 2 |
duke@435 | 1473 | THREAD); |
duke@435 | 1474 | } |
duke@435 | 1475 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 1476 | } |
duke@435 | 1477 | } |
duke@435 | 1478 | |
duke@435 | 1479 | // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
duke@435 | 1480 | // the execution of the method. If that is not enough, then we don't really care. Thread.stop |
duke@435 | 1481 | // is deprecated anyhow. |
duke@435 | 1482 | { int count = 3; |
duke@435 | 1483 | while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { |
duke@435 | 1484 | EXCEPTION_MARK; |
duke@435 | 1485 | JavaValue result(T_VOID); |
duke@435 | 1486 | KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); |
duke@435 | 1487 | JavaCalls::call_virtual(&result, |
duke@435 | 1488 | threadObj, thread_klass, |
duke@435 | 1489 | vmSymbolHandles::exit_method_name(), |
duke@435 | 1490 | vmSymbolHandles::void_method_signature(), |
duke@435 | 1491 | THREAD); |
duke@435 | 1492 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 1493 | } |
duke@435 | 1494 | } |
duke@435 | 1495 | |
duke@435 | 1496 | // notify JVMTI |
duke@435 | 1497 | if (JvmtiExport::should_post_thread_life()) { |
duke@435 | 1498 | JvmtiExport::post_thread_end(this); |
duke@435 | 1499 | } |
duke@435 | 1500 | |
duke@435 | 1501 | // We have notified the agents that we are exiting, before we go on, |
duke@435 | 1502 | // we must check for a pending external suspend request and honor it |
duke@435 | 1503 | // in order to not surprise the thread that made the suspend request. |
duke@435 | 1504 | while (true) { |
duke@435 | 1505 | { |
duke@435 | 1506 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 1507 | if (!is_external_suspend()) { |
duke@435 | 1508 | set_terminated(_thread_exiting); |
duke@435 | 1509 | ThreadService::current_thread_exiting(this); |
duke@435 | 1510 | break; |
duke@435 | 1511 | } |
duke@435 | 1512 | // Implied else: |
duke@435 | 1513 | // Things get a little tricky here. We have a pending external |
duke@435 | 1514 | // suspend request, but we are holding the SR_lock so we |
duke@435 | 1515 | // can't just self-suspend. So we temporarily drop the lock |
duke@435 | 1516 | // and then self-suspend. |
duke@435 | 1517 | } |
duke@435 | 1518 | |
duke@435 | 1519 | ThreadBlockInVM tbivm(this); |
duke@435 | 1520 | java_suspend_self(); |
duke@435 | 1521 | |
duke@435 | 1522 | // We're done with this suspend request, but we have to loop around |
duke@435 | 1523 | // and check again. Eventually we will get SR_lock without a pending |
duke@435 | 1524 | // external suspend request and will be able to mark ourselves as |
duke@435 | 1525 | // exiting. |
duke@435 | 1526 | } |
duke@435 | 1527 | // no more external suspends are allowed at this point |
duke@435 | 1528 | } else { |
duke@435 | 1529 | // before_exit() has already posted JVMTI THREAD_END events |
duke@435 | 1530 | } |
duke@435 | 1531 | |
duke@435 | 1532 | // Notify waiters on thread object. This has to be done after exit() is called |
duke@435 | 1533 | // on the thread (if the thread is the last thread in a daemon ThreadGroup the |
duke@435 | 1534 | // group should have the destroyed bit set before waiters are notified). |
duke@435 | 1535 | ensure_join(this); |
duke@435 | 1536 | assert(!this->has_pending_exception(), "ensure_join should have cleared"); |
duke@435 | 1537 | |
duke@435 | 1538 | // 6282335 JNI DetachCurrentThread spec states that all Java monitors |
duke@435 | 1539 | // held by this thread must be released. A detach operation must only |
duke@435 | 1540 | // get here if there are no Java frames on the stack. Therefore, any |
duke@435 | 1541 | // owned monitors at this point MUST be JNI-acquired monitors which are |
duke@435 | 1542 | // pre-inflated and in the monitor cache. |
duke@435 | 1543 | // |
duke@435 | 1544 | // ensure_join() ignores IllegalThreadStateExceptions, and so does this. |
duke@435 | 1545 | if (exit_type == jni_detach && JNIDetachReleasesMonitors) { |
duke@435 | 1546 | assert(!this->has_last_Java_frame(), "detaching with Java frames?"); |
duke@435 | 1547 | ObjectSynchronizer::release_monitors_owned_by_thread(this); |
duke@435 | 1548 | assert(!this->has_pending_exception(), "release_monitors should have cleared"); |
duke@435 | 1549 | } |
duke@435 | 1550 | |
duke@435 | 1551 | // These things needs to be done while we are still a Java Thread. Make sure that thread |
duke@435 | 1552 | // is in a consistent state, in case GC happens |
duke@435 | 1553 | assert(_privileged_stack_top == NULL, "must be NULL when we get here"); |
duke@435 | 1554 | |
duke@435 | 1555 | if (active_handles() != NULL) { |
duke@435 | 1556 | JNIHandleBlock* block = active_handles(); |
duke@435 | 1557 | set_active_handles(NULL); |
duke@435 | 1558 | JNIHandleBlock::release_block(block); |
duke@435 | 1559 | } |
duke@435 | 1560 | |
duke@435 | 1561 | if (free_handle_block() != NULL) { |
duke@435 | 1562 | JNIHandleBlock* block = free_handle_block(); |
duke@435 | 1563 | set_free_handle_block(NULL); |
duke@435 | 1564 | JNIHandleBlock::release_block(block); |
duke@435 | 1565 | } |
duke@435 | 1566 | |
duke@435 | 1567 | // These have to be removed while this is still a valid thread. |
duke@435 | 1568 | remove_stack_guard_pages(); |
duke@435 | 1569 | |
duke@435 | 1570 | if (UseTLAB) { |
duke@435 | 1571 | tlab().make_parsable(true); // retire TLAB |
duke@435 | 1572 | } |
duke@435 | 1573 | |
duke@435 | 1574 | // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
duke@435 | 1575 | Threads::remove(this); |
duke@435 | 1576 | } |
duke@435 | 1577 | |
duke@435 | 1578 | void JavaThread::cleanup_failed_attach_current_thread() { |
duke@435 | 1579 | |
duke@435 | 1580 | if (get_thread_profiler() != NULL) { |
duke@435 | 1581 | get_thread_profiler()->disengage(); |
duke@435 | 1582 | ResourceMark rm; |
duke@435 | 1583 | get_thread_profiler()->print(get_thread_name()); |
duke@435 | 1584 | } |
duke@435 | 1585 | |
duke@435 | 1586 | if (active_handles() != NULL) { |
duke@435 | 1587 | JNIHandleBlock* block = active_handles(); |
duke@435 | 1588 | set_active_handles(NULL); |
duke@435 | 1589 | JNIHandleBlock::release_block(block); |
duke@435 | 1590 | } |
duke@435 | 1591 | |
duke@435 | 1592 | if (free_handle_block() != NULL) { |
duke@435 | 1593 | JNIHandleBlock* block = free_handle_block(); |
duke@435 | 1594 | set_free_handle_block(NULL); |
duke@435 | 1595 | JNIHandleBlock::release_block(block); |
duke@435 | 1596 | } |
duke@435 | 1597 | |
duke@435 | 1598 | if (UseTLAB) { |
duke@435 | 1599 | tlab().make_parsable(true); // retire TLAB, if any |
duke@435 | 1600 | } |
duke@435 | 1601 | |
duke@435 | 1602 | Threads::remove(this); |
duke@435 | 1603 | delete this; |
duke@435 | 1604 | } |
duke@435 | 1605 | |
duke@435 | 1606 | |
duke@435 | 1607 | JavaThread* JavaThread::active() { |
duke@435 | 1608 | Thread* thread = ThreadLocalStorage::thread(); |
duke@435 | 1609 | assert(thread != NULL, "just checking"); |
duke@435 | 1610 | if (thread->is_Java_thread()) { |
duke@435 | 1611 | return (JavaThread*) thread; |
duke@435 | 1612 | } else { |
duke@435 | 1613 | assert(thread->is_VM_thread(), "this must be a vm thread"); |
duke@435 | 1614 | VM_Operation* op = ((VMThread*) thread)->vm_operation(); |
duke@435 | 1615 | JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); |
duke@435 | 1616 | assert(ret->is_Java_thread(), "must be a Java thread"); |
duke@435 | 1617 | return ret; |
duke@435 | 1618 | } |
duke@435 | 1619 | } |
duke@435 | 1620 | |
duke@435 | 1621 | bool JavaThread::is_lock_owned(address adr) const { |
duke@435 | 1622 | if (lock_is_in_stack(adr)) return true; |
duke@435 | 1623 | |
duke@435 | 1624 | for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { |
duke@435 | 1625 | if (chunk->contains(adr)) return true; |
duke@435 | 1626 | } |
duke@435 | 1627 | |
duke@435 | 1628 | return false; |
duke@435 | 1629 | } |
duke@435 | 1630 | |
duke@435 | 1631 | |
duke@435 | 1632 | void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { |
duke@435 | 1633 | chunk->set_next(monitor_chunks()); |
duke@435 | 1634 | set_monitor_chunks(chunk); |
duke@435 | 1635 | } |
duke@435 | 1636 | |
duke@435 | 1637 | void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { |
duke@435 | 1638 | guarantee(monitor_chunks() != NULL, "must be non empty"); |
duke@435 | 1639 | if (monitor_chunks() == chunk) { |
duke@435 | 1640 | set_monitor_chunks(chunk->next()); |
duke@435 | 1641 | } else { |
duke@435 | 1642 | MonitorChunk* prev = monitor_chunks(); |
duke@435 | 1643 | while (prev->next() != chunk) prev = prev->next(); |
duke@435 | 1644 | prev->set_next(chunk->next()); |
duke@435 | 1645 | } |
duke@435 | 1646 | } |
duke@435 | 1647 | |
duke@435 | 1648 | // JVM support. |
duke@435 | 1649 | |
duke@435 | 1650 | // Note: this function shouldn't block if it's called in |
duke@435 | 1651 | // _thread_in_native_trans state (such as from |
duke@435 | 1652 | // check_special_condition_for_native_trans()). |
duke@435 | 1653 | void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { |
duke@435 | 1654 | |
duke@435 | 1655 | if (has_last_Java_frame() && has_async_condition()) { |
duke@435 | 1656 | // If we are at a polling page safepoint (not a poll return) |
duke@435 | 1657 | // then we must defer async exception because live registers |
duke@435 | 1658 | // will be clobbered by the exception path. Poll return is |
duke@435 | 1659 | // ok because the call we a returning from already collides |
duke@435 | 1660 | // with exception handling registers and so there is no issue. |
duke@435 | 1661 | // (The exception handling path kills call result registers but |
duke@435 | 1662 | // this is ok since the exception kills the result anyway). |
duke@435 | 1663 | |
duke@435 | 1664 | if (is_at_poll_safepoint()) { |
duke@435 | 1665 | // if the code we are returning to has deoptimized we must defer |
duke@435 | 1666 | // the exception otherwise live registers get clobbered on the |
duke@435 | 1667 | // exception path before deoptimization is able to retrieve them. |
duke@435 | 1668 | // |
duke@435 | 1669 | RegisterMap map(this, false); |
duke@435 | 1670 | frame caller_fr = last_frame().sender(&map); |
duke@435 | 1671 | assert(caller_fr.is_compiled_frame(), "what?"); |
duke@435 | 1672 | if (caller_fr.is_deoptimized_frame()) { |
duke@435 | 1673 | if (TraceExceptions) { |
duke@435 | 1674 | ResourceMark rm; |
duke@435 | 1675 | tty->print_cr("deferred async exception at compiled safepoint"); |
duke@435 | 1676 | } |
duke@435 | 1677 | return; |
duke@435 | 1678 | } |
duke@435 | 1679 | } |
duke@435 | 1680 | } |
duke@435 | 1681 | |
duke@435 | 1682 | JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); |
duke@435 | 1683 | if (condition == _no_async_condition) { |
duke@435 | 1684 | // Conditions have changed since has_special_runtime_exit_condition() |
duke@435 | 1685 | // was called: |
duke@435 | 1686 | // - if we were here only because of an external suspend request, |
duke@435 | 1687 | // then that was taken care of above (or cancelled) so we are done |
duke@435 | 1688 | // - if we were here because of another async request, then it has |
duke@435 | 1689 | // been cleared between the has_special_runtime_exit_condition() |
duke@435 | 1690 | // and now so again we are done |
duke@435 | 1691 | return; |
duke@435 | 1692 | } |
duke@435 | 1693 | |
duke@435 | 1694 | // Check for pending async. exception |
duke@435 | 1695 | if (_pending_async_exception != NULL) { |
duke@435 | 1696 | // Only overwrite an already pending exception, if it is not a threadDeath. |
duke@435 | 1697 | if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::threaddeath_klass())) { |
duke@435 | 1698 | |
duke@435 | 1699 | // We cannot call Exceptions::_throw(...) here because we cannot block |
duke@435 | 1700 | set_pending_exception(_pending_async_exception, __FILE__, __LINE__); |
duke@435 | 1701 | |
duke@435 | 1702 | if (TraceExceptions) { |
duke@435 | 1703 | ResourceMark rm; |
duke@435 | 1704 | tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); |
duke@435 | 1705 | if (has_last_Java_frame() ) { |
duke@435 | 1706 | frame f = last_frame(); |
duke@435 | 1707 | tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); |
duke@435 | 1708 | } |
duke@435 | 1709 | tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); |
duke@435 | 1710 | } |
duke@435 | 1711 | _pending_async_exception = NULL; |
duke@435 | 1712 | clear_has_async_exception(); |
duke@435 | 1713 | } |
duke@435 | 1714 | } |
duke@435 | 1715 | |
duke@435 | 1716 | if (check_unsafe_error && |
duke@435 | 1717 | condition == _async_unsafe_access_error && !has_pending_exception()) { |
duke@435 | 1718 | condition = _no_async_condition; // done |
duke@435 | 1719 | switch (thread_state()) { |
duke@435 | 1720 | case _thread_in_vm: |
duke@435 | 1721 | { |
duke@435 | 1722 | JavaThread* THREAD = this; |
duke@435 | 1723 | THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); |
duke@435 | 1724 | } |
duke@435 | 1725 | case _thread_in_native: |
duke@435 | 1726 | { |
duke@435 | 1727 | ThreadInVMfromNative tiv(this); |
duke@435 | 1728 | JavaThread* THREAD = this; |
duke@435 | 1729 | THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); |
duke@435 | 1730 | } |
duke@435 | 1731 | case _thread_in_Java: |
duke@435 | 1732 | { |
duke@435 | 1733 | ThreadInVMfromJava tiv(this); |
duke@435 | 1734 | JavaThread* THREAD = this; |
duke@435 | 1735 | THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); |
duke@435 | 1736 | } |
duke@435 | 1737 | default: |
duke@435 | 1738 | ShouldNotReachHere(); |
duke@435 | 1739 | } |
duke@435 | 1740 | } |
duke@435 | 1741 | |
duke@435 | 1742 | assert(condition == _no_async_condition || has_pending_exception() || |
duke@435 | 1743 | (!check_unsafe_error && condition == _async_unsafe_access_error), |
duke@435 | 1744 | "must have handled the async condition, if no exception"); |
duke@435 | 1745 | } |
duke@435 | 1746 | |
duke@435 | 1747 | void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { |
duke@435 | 1748 | // |
duke@435 | 1749 | // Check for pending external suspend. Internal suspend requests do |
duke@435 | 1750 | // not use handle_special_runtime_exit_condition(). |
duke@435 | 1751 | // If JNIEnv proxies are allowed, don't self-suspend if the target |
duke@435 | 1752 | // thread is not the current thread. In older versions of jdbx, jdbx |
duke@435 | 1753 | // threads could call into the VM with another thread's JNIEnv so we |
duke@435 | 1754 | // can be here operating on behalf of a suspended thread (4432884). |
duke@435 | 1755 | bool do_self_suspend = is_external_suspend_with_lock(); |
duke@435 | 1756 | if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { |
duke@435 | 1757 | // |
duke@435 | 1758 | // Because thread is external suspended the safepoint code will count |
duke@435 | 1759 | // thread as at a safepoint. This can be odd because we can be here |
duke@435 | 1760 | // as _thread_in_Java which would normally transition to _thread_blocked |
duke@435 | 1761 | // at a safepoint. We would like to mark the thread as _thread_blocked |
duke@435 | 1762 | // before calling java_suspend_self like all other callers of it but |
duke@435 | 1763 | // we must then observe proper safepoint protocol. (We can't leave |
duke@435 | 1764 | // _thread_blocked with a safepoint in progress). However we can be |
duke@435 | 1765 | // here as _thread_in_native_trans so we can't use a normal transition |
duke@435 | 1766 | // constructor/destructor pair because they assert on that type of |
duke@435 | 1767 | // transition. We could do something like: |
duke@435 | 1768 | // |
duke@435 | 1769 | // JavaThreadState state = thread_state(); |
duke@435 | 1770 | // set_thread_state(_thread_in_vm); |
duke@435 | 1771 | // { |
duke@435 | 1772 | // ThreadBlockInVM tbivm(this); |
duke@435 | 1773 | // java_suspend_self() |
duke@435 | 1774 | // } |
duke@435 | 1775 | // set_thread_state(_thread_in_vm_trans); |
duke@435 | 1776 | // if (safepoint) block; |
duke@435 | 1777 | // set_thread_state(state); |
duke@435 | 1778 | // |
duke@435 | 1779 | // but that is pretty messy. Instead we just go with the way the |
duke@435 | 1780 | // code has worked before and note that this is the only path to |
duke@435 | 1781 | // java_suspend_self that doesn't put the thread in _thread_blocked |
duke@435 | 1782 | // mode. |
duke@435 | 1783 | |
duke@435 | 1784 | frame_anchor()->make_walkable(this); |
duke@435 | 1785 | java_suspend_self(); |
duke@435 | 1786 | |
duke@435 | 1787 | // We might be here for reasons in addition to the self-suspend request |
duke@435 | 1788 | // so check for other async requests. |
duke@435 | 1789 | } |
duke@435 | 1790 | |
duke@435 | 1791 | if (check_asyncs) { |
duke@435 | 1792 | check_and_handle_async_exceptions(); |
duke@435 | 1793 | } |
duke@435 | 1794 | } |
duke@435 | 1795 | |
duke@435 | 1796 | void JavaThread::send_thread_stop(oop java_throwable) { |
duke@435 | 1797 | assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); |
duke@435 | 1798 | assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); |
duke@435 | 1799 | assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); |
duke@435 | 1800 | |
duke@435 | 1801 | // Do not throw asynchronous exceptions against the compiler thread |
duke@435 | 1802 | // (the compiler thread should not be a Java thread -- fix in 1.4.2) |
duke@435 | 1803 | if (is_Compiler_thread()) return; |
duke@435 | 1804 | |
duke@435 | 1805 | // This is a change from JDK 1.1, but JDK 1.2 will also do it: |
duke@435 | 1806 | if (java_throwable->is_a(SystemDictionary::threaddeath_klass())) { |
duke@435 | 1807 | java_lang_Thread::set_stillborn(threadObj()); |
duke@435 | 1808 | } |
duke@435 | 1809 | |
duke@435 | 1810 | { |
duke@435 | 1811 | // Actually throw the Throwable against the target Thread - however |
duke@435 | 1812 | // only if there is no thread death exception installed already. |
duke@435 | 1813 | if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::threaddeath_klass())) { |
duke@435 | 1814 | // If the topmost frame is a runtime stub, then we are calling into |
duke@435 | 1815 | // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) |
duke@435 | 1816 | // must deoptimize the caller before continuing, as the compiled exception handler table |
duke@435 | 1817 | // may not be valid |
duke@435 | 1818 | if (has_last_Java_frame()) { |
duke@435 | 1819 | frame f = last_frame(); |
duke@435 | 1820 | if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { |
duke@435 | 1821 | // BiasedLocking needs an updated RegisterMap for the revoke monitors pass |
duke@435 | 1822 | RegisterMap reg_map(this, UseBiasedLocking); |
duke@435 | 1823 | frame compiled_frame = f.sender(®_map); |
duke@435 | 1824 | if (compiled_frame.can_be_deoptimized()) { |
duke@435 | 1825 | Deoptimization::deoptimize(this, compiled_frame, ®_map); |
duke@435 | 1826 | } |
duke@435 | 1827 | } |
duke@435 | 1828 | } |
duke@435 | 1829 | |
duke@435 | 1830 | // Set async. pending exception in thread. |
duke@435 | 1831 | set_pending_async_exception(java_throwable); |
duke@435 | 1832 | |
duke@435 | 1833 | if (TraceExceptions) { |
duke@435 | 1834 | ResourceMark rm; |
duke@435 | 1835 | tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); |
duke@435 | 1836 | } |
duke@435 | 1837 | // for AbortVMOnException flag |
duke@435 | 1838 | NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); |
duke@435 | 1839 | } |
duke@435 | 1840 | } |
duke@435 | 1841 | |
duke@435 | 1842 | |
duke@435 | 1843 | // Interrupt thread so it will wake up from a potential wait() |
duke@435 | 1844 | Thread::interrupt(this); |
duke@435 | 1845 | } |
duke@435 | 1846 | |
duke@435 | 1847 | // External suspension mechanism. |
duke@435 | 1848 | // |
duke@435 | 1849 | // Tell the VM to suspend a thread when ever it knows that it does not hold on |
duke@435 | 1850 | // to any VM_locks and it is at a transition |
duke@435 | 1851 | // Self-suspension will happen on the transition out of the vm. |
duke@435 | 1852 | // Catch "this" coming in from JNIEnv pointers when the thread has been freed |
duke@435 | 1853 | // |
duke@435 | 1854 | // Guarantees on return: |
duke@435 | 1855 | // + Target thread will not execute any new bytecode (that's why we need to |
duke@435 | 1856 | // force a safepoint) |
duke@435 | 1857 | // + Target thread will not enter any new monitors |
duke@435 | 1858 | // |
duke@435 | 1859 | void JavaThread::java_suspend() { |
duke@435 | 1860 | { MutexLocker mu(Threads_lock); |
duke@435 | 1861 | if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { |
duke@435 | 1862 | return; |
duke@435 | 1863 | } |
duke@435 | 1864 | } |
duke@435 | 1865 | |
duke@435 | 1866 | { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 1867 | if (!is_external_suspend()) { |
duke@435 | 1868 | // a racing resume has cancelled us; bail out now |
duke@435 | 1869 | return; |
duke@435 | 1870 | } |
duke@435 | 1871 | |
duke@435 | 1872 | // suspend is done |
duke@435 | 1873 | uint32_t debug_bits = 0; |
duke@435 | 1874 | // Warning: is_ext_suspend_completed() may temporarily drop the |
duke@435 | 1875 | // SR_lock to allow the thread to reach a stable thread state if |
duke@435 | 1876 | // it is currently in a transient thread state. |
duke@435 | 1877 | if (is_ext_suspend_completed(false /* !called_by_wait */, |
duke@435 | 1878 | SuspendRetryDelay, &debug_bits) ) { |
duke@435 | 1879 | return; |
duke@435 | 1880 | } |
duke@435 | 1881 | } |
duke@435 | 1882 | |
duke@435 | 1883 | VM_ForceSafepoint vm_suspend; |
duke@435 | 1884 | VMThread::execute(&vm_suspend); |
duke@435 | 1885 | } |
duke@435 | 1886 | |
duke@435 | 1887 | // Part II of external suspension. |
duke@435 | 1888 | // A JavaThread self suspends when it detects a pending external suspend |
duke@435 | 1889 | // request. This is usually on transitions. It is also done in places |
duke@435 | 1890 | // where continuing to the next transition would surprise the caller, |
duke@435 | 1891 | // e.g., monitor entry. |
duke@435 | 1892 | // |
duke@435 | 1893 | // Returns the number of times that the thread self-suspended. |
duke@435 | 1894 | // |
duke@435 | 1895 | // Note: DO NOT call java_suspend_self() when you just want to block current |
duke@435 | 1896 | // thread. java_suspend_self() is the second stage of cooperative |
duke@435 | 1897 | // suspension for external suspend requests and should only be used |
duke@435 | 1898 | // to complete an external suspend request. |
duke@435 | 1899 | // |
duke@435 | 1900 | int JavaThread::java_suspend_self() { |
duke@435 | 1901 | int ret = 0; |
duke@435 | 1902 | |
duke@435 | 1903 | // we are in the process of exiting so don't suspend |
duke@435 | 1904 | if (is_exiting()) { |
duke@435 | 1905 | clear_external_suspend(); |
duke@435 | 1906 | return ret; |
duke@435 | 1907 | } |
duke@435 | 1908 | |
duke@435 | 1909 | assert(_anchor.walkable() || |
duke@435 | 1910 | (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), |
duke@435 | 1911 | "must have walkable stack"); |
duke@435 | 1912 | |
duke@435 | 1913 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 1914 | |
duke@435 | 1915 | assert(!this->is_any_suspended(), |
duke@435 | 1916 | "a thread trying to self-suspend should not already be suspended"); |
duke@435 | 1917 | |
duke@435 | 1918 | if (this->is_suspend_equivalent()) { |
duke@435 | 1919 | // If we are self-suspending as a result of the lifting of a |
duke@435 | 1920 | // suspend equivalent condition, then the suspend_equivalent |
duke@435 | 1921 | // flag is not cleared until we set the ext_suspended flag so |
duke@435 | 1922 | // that wait_for_ext_suspend_completion() returns consistent |
duke@435 | 1923 | // results. |
duke@435 | 1924 | this->clear_suspend_equivalent(); |
duke@435 | 1925 | } |
duke@435 | 1926 | |
duke@435 | 1927 | // A racing resume may have cancelled us before we grabbed SR_lock |
duke@435 | 1928 | // above. Or another external suspend request could be waiting for us |
duke@435 | 1929 | // by the time we return from SR_lock()->wait(). The thread |
duke@435 | 1930 | // that requested the suspension may already be trying to walk our |
duke@435 | 1931 | // stack and if we return now, we can change the stack out from under |
duke@435 | 1932 | // it. This would be a "bad thing (TM)" and cause the stack walker |
duke@435 | 1933 | // to crash. We stay self-suspended until there are no more pending |
duke@435 | 1934 | // external suspend requests. |
duke@435 | 1935 | while (is_external_suspend()) { |
duke@435 | 1936 | ret++; |
duke@435 | 1937 | this->set_ext_suspended(); |
duke@435 | 1938 | |
duke@435 | 1939 | // _ext_suspended flag is cleared by java_resume() |
duke@435 | 1940 | while (is_ext_suspended()) { |
duke@435 | 1941 | this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); |
duke@435 | 1942 | } |
duke@435 | 1943 | } |
duke@435 | 1944 | |
duke@435 | 1945 | return ret; |
duke@435 | 1946 | } |
duke@435 | 1947 | |
duke@435 | 1948 | #ifdef ASSERT |
duke@435 | 1949 | // verify the JavaThread has not yet been published in the Threads::list, and |
duke@435 | 1950 | // hence doesn't need protection from concurrent access at this stage |
duke@435 | 1951 | void JavaThread::verify_not_published() { |
duke@435 | 1952 | if (!Threads_lock->owned_by_self()) { |
duke@435 | 1953 | MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); |
duke@435 | 1954 | assert( !Threads::includes(this), |
duke@435 | 1955 | "java thread shouldn't have been published yet!"); |
duke@435 | 1956 | } |
duke@435 | 1957 | else { |
duke@435 | 1958 | assert( !Threads::includes(this), |
duke@435 | 1959 | "java thread shouldn't have been published yet!"); |
duke@435 | 1960 | } |
duke@435 | 1961 | } |
duke@435 | 1962 | #endif |
duke@435 | 1963 | |
duke@435 | 1964 | // Slow path when the native==>VM/Java barriers detect a safepoint is in |
duke@435 | 1965 | // progress or when _suspend_flags is non-zero. |
duke@435 | 1966 | // Current thread needs to self-suspend if there is a suspend request and/or |
duke@435 | 1967 | // block if a safepoint is in progress. |
duke@435 | 1968 | // Async exception ISN'T checked. |
duke@435 | 1969 | // Note only the ThreadInVMfromNative transition can call this function |
duke@435 | 1970 | // directly and when thread state is _thread_in_native_trans |
duke@435 | 1971 | void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { |
duke@435 | 1972 | assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); |
duke@435 | 1973 | |
duke@435 | 1974 | JavaThread *curJT = JavaThread::current(); |
duke@435 | 1975 | bool do_self_suspend = thread->is_external_suspend(); |
duke@435 | 1976 | |
duke@435 | 1977 | assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); |
duke@435 | 1978 | |
duke@435 | 1979 | // If JNIEnv proxies are allowed, don't self-suspend if the target |
duke@435 | 1980 | // thread is not the current thread. In older versions of jdbx, jdbx |
duke@435 | 1981 | // threads could call into the VM with another thread's JNIEnv so we |
duke@435 | 1982 | // can be here operating on behalf of a suspended thread (4432884). |
duke@435 | 1983 | if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { |
duke@435 | 1984 | JavaThreadState state = thread->thread_state(); |
duke@435 | 1985 | |
duke@435 | 1986 | // We mark this thread_blocked state as a suspend-equivalent so |
duke@435 | 1987 | // that a caller to is_ext_suspend_completed() won't be confused. |
duke@435 | 1988 | // The suspend-equivalent state is cleared by java_suspend_self(). |
duke@435 | 1989 | thread->set_suspend_equivalent(); |
duke@435 | 1990 | |
duke@435 | 1991 | // If the safepoint code sees the _thread_in_native_trans state, it will |
duke@435 | 1992 | // wait until the thread changes to other thread state. There is no |
duke@435 | 1993 | // guarantee on how soon we can obtain the SR_lock and complete the |
duke@435 | 1994 | // self-suspend request. It would be a bad idea to let safepoint wait for |
duke@435 | 1995 | // too long. Temporarily change the state to _thread_blocked to |
duke@435 | 1996 | // let the VM thread know that this thread is ready for GC. The problem |
duke@435 | 1997 | // of changing thread state is that safepoint could happen just after |
duke@435 | 1998 | // java_suspend_self() returns after being resumed, and VM thread will |
duke@435 | 1999 | // see the _thread_blocked state. We must check for safepoint |
duke@435 | 2000 | // after restoring the state and make sure we won't leave while a safepoint |
duke@435 | 2001 | // is in progress. |
duke@435 | 2002 | thread->set_thread_state(_thread_blocked); |
duke@435 | 2003 | thread->java_suspend_self(); |
duke@435 | 2004 | thread->set_thread_state(state); |
duke@435 | 2005 | // Make sure new state is seen by VM thread |
duke@435 | 2006 | if (os::is_MP()) { |
duke@435 | 2007 | if (UseMembar) { |
duke@435 | 2008 | // Force a fence between the write above and read below |
duke@435 | 2009 | OrderAccess::fence(); |
duke@435 | 2010 | } else { |
duke@435 | 2011 | // Must use this rather than serialization page in particular on Windows |
duke@435 | 2012 | InterfaceSupport::serialize_memory(thread); |
duke@435 | 2013 | } |
duke@435 | 2014 | } |
duke@435 | 2015 | } |
duke@435 | 2016 | |
duke@435 | 2017 | if (SafepointSynchronize::do_call_back()) { |
duke@435 | 2018 | // If we are safepointing, then block the caller which may not be |
duke@435 | 2019 | // the same as the target thread (see above). |
duke@435 | 2020 | SafepointSynchronize::block(curJT); |
duke@435 | 2021 | } |
duke@435 | 2022 | |
duke@435 | 2023 | if (thread->is_deopt_suspend()) { |
duke@435 | 2024 | thread->clear_deopt_suspend(); |
duke@435 | 2025 | RegisterMap map(thread, false); |
duke@435 | 2026 | frame f = thread->last_frame(); |
duke@435 | 2027 | while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { |
duke@435 | 2028 | f = f.sender(&map); |
duke@435 | 2029 | } |
duke@435 | 2030 | if (f.id() == thread->must_deopt_id()) { |
duke@435 | 2031 | thread->clear_must_deopt_id(); |
duke@435 | 2032 | // Since we know we're safe to deopt the current state is a safe state |
duke@435 | 2033 | f.deoptimize(thread, true); |
duke@435 | 2034 | } else { |
duke@435 | 2035 | fatal("missed deoptimization!"); |
duke@435 | 2036 | } |
duke@435 | 2037 | } |
duke@435 | 2038 | } |
duke@435 | 2039 | |
duke@435 | 2040 | // Slow path when the native==>VM/Java barriers detect a safepoint is in |
duke@435 | 2041 | // progress or when _suspend_flags is non-zero. |
duke@435 | 2042 | // Current thread needs to self-suspend if there is a suspend request and/or |
duke@435 | 2043 | // block if a safepoint is in progress. |
duke@435 | 2044 | // Also check for pending async exception (not including unsafe access error). |
duke@435 | 2045 | // Note only the native==>VM/Java barriers can call this function and when |
duke@435 | 2046 | // thread state is _thread_in_native_trans. |
duke@435 | 2047 | void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { |
duke@435 | 2048 | check_safepoint_and_suspend_for_native_trans(thread); |
duke@435 | 2049 | |
duke@435 | 2050 | if (thread->has_async_exception()) { |
duke@435 | 2051 | // We are in _thread_in_native_trans state, don't handle unsafe |
duke@435 | 2052 | // access error since that may block. |
duke@435 | 2053 | thread->check_and_handle_async_exceptions(false); |
duke@435 | 2054 | } |
duke@435 | 2055 | } |
duke@435 | 2056 | |
duke@435 | 2057 | // We need to guarantee the Threads_lock here, since resumes are not |
duke@435 | 2058 | // allowed during safepoint synchronization |
duke@435 | 2059 | // Can only resume from an external suspension |
duke@435 | 2060 | void JavaThread::java_resume() { |
duke@435 | 2061 | assert_locked_or_safepoint(Threads_lock); |
duke@435 | 2062 | |
duke@435 | 2063 | // Sanity check: thread is gone, has started exiting or the thread |
duke@435 | 2064 | // was not externally suspended. |
duke@435 | 2065 | if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { |
duke@435 | 2066 | return; |
duke@435 | 2067 | } |
duke@435 | 2068 | |
duke@435 | 2069 | MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); |
duke@435 | 2070 | |
duke@435 | 2071 | clear_external_suspend(); |
duke@435 | 2072 | |
duke@435 | 2073 | if (is_ext_suspended()) { |
duke@435 | 2074 | clear_ext_suspended(); |
duke@435 | 2075 | SR_lock()->notify_all(); |
duke@435 | 2076 | } |
duke@435 | 2077 | } |
duke@435 | 2078 | |
duke@435 | 2079 | void JavaThread::create_stack_guard_pages() { |
duke@435 | 2080 | if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; |
duke@435 | 2081 | address low_addr = stack_base() - stack_size(); |
duke@435 | 2082 | size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); |
duke@435 | 2083 | |
duke@435 | 2084 | int allocate = os::allocate_stack_guard_pages(); |
duke@435 | 2085 | // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); |
duke@435 | 2086 | |
duke@435 | 2087 | if (allocate && !os::commit_memory((char *) low_addr, len)) { |
duke@435 | 2088 | warning("Attempt to allocate stack guard pages failed."); |
duke@435 | 2089 | return; |
duke@435 | 2090 | } |
duke@435 | 2091 | |
duke@435 | 2092 | if (os::guard_memory((char *) low_addr, len)) { |
duke@435 | 2093 | _stack_guard_state = stack_guard_enabled; |
duke@435 | 2094 | } else { |
duke@435 | 2095 | warning("Attempt to protect stack guard pages failed."); |
duke@435 | 2096 | if (os::uncommit_memory((char *) low_addr, len)) { |
duke@435 | 2097 | warning("Attempt to deallocate stack guard pages failed."); |
duke@435 | 2098 | } |
duke@435 | 2099 | } |
duke@435 | 2100 | } |
duke@435 | 2101 | |
duke@435 | 2102 | void JavaThread::remove_stack_guard_pages() { |
duke@435 | 2103 | if (_stack_guard_state == stack_guard_unused) return; |
duke@435 | 2104 | address low_addr = stack_base() - stack_size(); |
duke@435 | 2105 | size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); |
duke@435 | 2106 | |
duke@435 | 2107 | if (os::allocate_stack_guard_pages()) { |
duke@435 | 2108 | if (os::uncommit_memory((char *) low_addr, len)) { |
duke@435 | 2109 | _stack_guard_state = stack_guard_unused; |
duke@435 | 2110 | } else { |
duke@435 | 2111 | warning("Attempt to deallocate stack guard pages failed."); |
duke@435 | 2112 | } |
duke@435 | 2113 | } else { |
duke@435 | 2114 | if (_stack_guard_state == stack_guard_unused) return; |
duke@435 | 2115 | if (os::unguard_memory((char *) low_addr, len)) { |
duke@435 | 2116 | _stack_guard_state = stack_guard_unused; |
duke@435 | 2117 | } else { |
duke@435 | 2118 | warning("Attempt to unprotect stack guard pages failed."); |
duke@435 | 2119 | } |
duke@435 | 2120 | } |
duke@435 | 2121 | } |
duke@435 | 2122 | |
duke@435 | 2123 | void JavaThread::enable_stack_yellow_zone() { |
duke@435 | 2124 | assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); |
duke@435 | 2125 | assert(_stack_guard_state != stack_guard_enabled, "already enabled"); |
duke@435 | 2126 | |
duke@435 | 2127 | // The base notation is from the stacks point of view, growing downward. |
duke@435 | 2128 | // We need to adjust it to work correctly with guard_memory() |
duke@435 | 2129 | address base = stack_yellow_zone_base() - stack_yellow_zone_size(); |
duke@435 | 2130 | |
duke@435 | 2131 | guarantee(base < stack_base(),"Error calculating stack yellow zone"); |
duke@435 | 2132 | guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); |
duke@435 | 2133 | |
duke@435 | 2134 | if (os::guard_memory((char *) base, stack_yellow_zone_size())) { |
duke@435 | 2135 | _stack_guard_state = stack_guard_enabled; |
duke@435 | 2136 | } else { |
duke@435 | 2137 | warning("Attempt to guard stack yellow zone failed."); |
duke@435 | 2138 | } |
duke@435 | 2139 | enable_register_stack_guard(); |
duke@435 | 2140 | } |
duke@435 | 2141 | |
duke@435 | 2142 | void JavaThread::disable_stack_yellow_zone() { |
duke@435 | 2143 | assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); |
duke@435 | 2144 | assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); |
duke@435 | 2145 | |
duke@435 | 2146 | // Simply return if called for a thread that does not use guard pages. |
duke@435 | 2147 | if (_stack_guard_state == stack_guard_unused) return; |
duke@435 | 2148 | |
duke@435 | 2149 | // The base notation is from the stacks point of view, growing downward. |
duke@435 | 2150 | // We need to adjust it to work correctly with guard_memory() |
duke@435 | 2151 | address base = stack_yellow_zone_base() - stack_yellow_zone_size(); |
duke@435 | 2152 | |
duke@435 | 2153 | if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { |
duke@435 | 2154 | _stack_guard_state = stack_guard_yellow_disabled; |
duke@435 | 2155 | } else { |
duke@435 | 2156 | warning("Attempt to unguard stack yellow zone failed."); |
duke@435 | 2157 | } |
duke@435 | 2158 | disable_register_stack_guard(); |
duke@435 | 2159 | } |
duke@435 | 2160 | |
duke@435 | 2161 | void JavaThread::enable_stack_red_zone() { |
duke@435 | 2162 | // The base notation is from the stacks point of view, growing downward. |
duke@435 | 2163 | // We need to adjust it to work correctly with guard_memory() |
duke@435 | 2164 | assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); |
duke@435 | 2165 | address base = stack_red_zone_base() - stack_red_zone_size(); |
duke@435 | 2166 | |
duke@435 | 2167 | guarantee(base < stack_base(),"Error calculating stack red zone"); |
duke@435 | 2168 | guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); |
duke@435 | 2169 | |
duke@435 | 2170 | if(!os::guard_memory((char *) base, stack_red_zone_size())) { |
duke@435 | 2171 | warning("Attempt to guard stack red zone failed."); |
duke@435 | 2172 | } |
duke@435 | 2173 | } |
duke@435 | 2174 | |
duke@435 | 2175 | void JavaThread::disable_stack_red_zone() { |
duke@435 | 2176 | // The base notation is from the stacks point of view, growing downward. |
duke@435 | 2177 | // We need to adjust it to work correctly with guard_memory() |
duke@435 | 2178 | assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); |
duke@435 | 2179 | address base = stack_red_zone_base() - stack_red_zone_size(); |
duke@435 | 2180 | if (!os::unguard_memory((char *)base, stack_red_zone_size())) { |
duke@435 | 2181 | warning("Attempt to unguard stack red zone failed."); |
duke@435 | 2182 | } |
duke@435 | 2183 | } |
duke@435 | 2184 | |
duke@435 | 2185 | void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { |
duke@435 | 2186 | // ignore is there is no stack |
duke@435 | 2187 | if (!has_last_Java_frame()) return; |
duke@435 | 2188 | // traverse the stack frames. Starts from top frame. |
duke@435 | 2189 | for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
duke@435 | 2190 | frame* fr = fst.current(); |
duke@435 | 2191 | f(fr, fst.register_map()); |
duke@435 | 2192 | } |
duke@435 | 2193 | } |
duke@435 | 2194 | |
duke@435 | 2195 | |
duke@435 | 2196 | #ifndef PRODUCT |
duke@435 | 2197 | // Deoptimization |
duke@435 | 2198 | // Function for testing deoptimization |
duke@435 | 2199 | void JavaThread::deoptimize() { |
duke@435 | 2200 | // BiasedLocking needs an updated RegisterMap for the revoke monitors pass |
duke@435 | 2201 | StackFrameStream fst(this, UseBiasedLocking); |
duke@435 | 2202 | bool deopt = false; // Dump stack only if a deopt actually happens. |
duke@435 | 2203 | bool only_at = strlen(DeoptimizeOnlyAt) > 0; |
duke@435 | 2204 | // Iterate over all frames in the thread and deoptimize |
duke@435 | 2205 | for(; !fst.is_done(); fst.next()) { |
duke@435 | 2206 | if(fst.current()->can_be_deoptimized()) { |
duke@435 | 2207 | |
duke@435 | 2208 | if (only_at) { |
duke@435 | 2209 | // Deoptimize only at particular bcis. DeoptimizeOnlyAt |
duke@435 | 2210 | // consists of comma or carriage return separated numbers so |
duke@435 | 2211 | // search for the current bci in that string. |
duke@435 | 2212 | address pc = fst.current()->pc(); |
duke@435 | 2213 | nmethod* nm = (nmethod*) fst.current()->cb(); |
duke@435 | 2214 | ScopeDesc* sd = nm->scope_desc_at( pc); |
duke@435 | 2215 | char buffer[8]; |
duke@435 | 2216 | jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); |
duke@435 | 2217 | size_t len = strlen(buffer); |
duke@435 | 2218 | const char * found = strstr(DeoptimizeOnlyAt, buffer); |
duke@435 | 2219 | while (found != NULL) { |
duke@435 | 2220 | if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && |
duke@435 | 2221 | (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { |
duke@435 | 2222 | // Check that the bci found is bracketed by terminators. |
duke@435 | 2223 | break; |
duke@435 | 2224 | } |
duke@435 | 2225 | found = strstr(found + 1, buffer); |
duke@435 | 2226 | } |
duke@435 | 2227 | if (!found) { |
duke@435 | 2228 | continue; |
duke@435 | 2229 | } |
duke@435 | 2230 | } |
duke@435 | 2231 | |
duke@435 | 2232 | if (DebugDeoptimization && !deopt) { |
duke@435 | 2233 | deopt = true; // One-time only print before deopt |
duke@435 | 2234 | tty->print_cr("[BEFORE Deoptimization]"); |
duke@435 | 2235 | trace_frames(); |
duke@435 | 2236 | trace_stack(); |
duke@435 | 2237 | } |
duke@435 | 2238 | Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
duke@435 | 2239 | } |
duke@435 | 2240 | } |
duke@435 | 2241 | |
duke@435 | 2242 | if (DebugDeoptimization && deopt) { |
duke@435 | 2243 | tty->print_cr("[AFTER Deoptimization]"); |
duke@435 | 2244 | trace_frames(); |
duke@435 | 2245 | } |
duke@435 | 2246 | } |
duke@435 | 2247 | |
duke@435 | 2248 | |
duke@435 | 2249 | // Make zombies |
duke@435 | 2250 | void JavaThread::make_zombies() { |
duke@435 | 2251 | for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
duke@435 | 2252 | if (fst.current()->can_be_deoptimized()) { |
duke@435 | 2253 | // it is a Java nmethod |
duke@435 | 2254 | nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); |
duke@435 | 2255 | nm->make_not_entrant(); |
duke@435 | 2256 | } |
duke@435 | 2257 | } |
duke@435 | 2258 | } |
duke@435 | 2259 | #endif // PRODUCT |
duke@435 | 2260 | |
duke@435 | 2261 | |
duke@435 | 2262 | void JavaThread::deoptimized_wrt_marked_nmethods() { |
duke@435 | 2263 | if (!has_last_Java_frame()) return; |
duke@435 | 2264 | // BiasedLocking needs an updated RegisterMap for the revoke monitors pass |
duke@435 | 2265 | StackFrameStream fst(this, UseBiasedLocking); |
duke@435 | 2266 | for(; !fst.is_done(); fst.next()) { |
duke@435 | 2267 | if (fst.current()->should_be_deoptimized()) { |
duke@435 | 2268 | Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); |
duke@435 | 2269 | } |
duke@435 | 2270 | } |
duke@435 | 2271 | } |
duke@435 | 2272 | |
duke@435 | 2273 | |
duke@435 | 2274 | // GC support |
duke@435 | 2275 | static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } |
duke@435 | 2276 | |
duke@435 | 2277 | void JavaThread::gc_epilogue() { |
duke@435 | 2278 | frames_do(frame_gc_epilogue); |
duke@435 | 2279 | } |
duke@435 | 2280 | |
duke@435 | 2281 | |
duke@435 | 2282 | static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } |
duke@435 | 2283 | |
duke@435 | 2284 | void JavaThread::gc_prologue() { |
duke@435 | 2285 | frames_do(frame_gc_prologue); |
duke@435 | 2286 | } |
duke@435 | 2287 | |
duke@435 | 2288 | |
duke@435 | 2289 | void JavaThread::oops_do(OopClosure* f) { |
duke@435 | 2290 | // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
duke@435 | 2291 | // since there may be more than one thread using each ThreadProfiler. |
duke@435 | 2292 | |
duke@435 | 2293 | // Traverse the GCHandles |
duke@435 | 2294 | Thread::oops_do(f); |
duke@435 | 2295 | |
duke@435 | 2296 | assert( (!has_last_Java_frame() && java_call_counter() == 0) || |
duke@435 | 2297 | (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); |
duke@435 | 2298 | |
duke@435 | 2299 | if (has_last_Java_frame()) { |
duke@435 | 2300 | |
duke@435 | 2301 | // Traverse the privileged stack |
duke@435 | 2302 | if (_privileged_stack_top != NULL) { |
duke@435 | 2303 | _privileged_stack_top->oops_do(f); |
duke@435 | 2304 | } |
duke@435 | 2305 | |
duke@435 | 2306 | // traverse the registered growable array |
duke@435 | 2307 | if (_array_for_gc != NULL) { |
duke@435 | 2308 | for (int index = 0; index < _array_for_gc->length(); index++) { |
duke@435 | 2309 | f->do_oop(_array_for_gc->adr_at(index)); |
duke@435 | 2310 | } |
duke@435 | 2311 | } |
duke@435 | 2312 | |
duke@435 | 2313 | // Traverse the monitor chunks |
duke@435 | 2314 | for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { |
duke@435 | 2315 | chunk->oops_do(f); |
duke@435 | 2316 | } |
duke@435 | 2317 | |
duke@435 | 2318 | // Traverse the execution stack |
duke@435 | 2319 | for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
duke@435 | 2320 | fst.current()->oops_do(f, fst.register_map()); |
duke@435 | 2321 | } |
duke@435 | 2322 | } |
duke@435 | 2323 | |
duke@435 | 2324 | // callee_target is never live across a gc point so NULL it here should |
duke@435 | 2325 | // it still contain a methdOop. |
duke@435 | 2326 | |
duke@435 | 2327 | set_callee_target(NULL); |
duke@435 | 2328 | |
duke@435 | 2329 | assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); |
duke@435 | 2330 | // If we have deferred set_locals there might be oops waiting to be |
duke@435 | 2331 | // written |
duke@435 | 2332 | GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); |
duke@435 | 2333 | if (list != NULL) { |
duke@435 | 2334 | for (int i = 0; i < list->length(); i++) { |
duke@435 | 2335 | list->at(i)->oops_do(f); |
duke@435 | 2336 | } |
duke@435 | 2337 | } |
duke@435 | 2338 | |
duke@435 | 2339 | // Traverse instance variables at the end since the GC may be moving things |
duke@435 | 2340 | // around using this function |
duke@435 | 2341 | f->do_oop((oop*) &_threadObj); |
duke@435 | 2342 | f->do_oop((oop*) &_vm_result); |
duke@435 | 2343 | f->do_oop((oop*) &_vm_result_2); |
duke@435 | 2344 | f->do_oop((oop*) &_exception_oop); |
duke@435 | 2345 | f->do_oop((oop*) &_pending_async_exception); |
duke@435 | 2346 | |
duke@435 | 2347 | if (jvmti_thread_state() != NULL) { |
duke@435 | 2348 | jvmti_thread_state()->oops_do(f); |
duke@435 | 2349 | } |
duke@435 | 2350 | } |
duke@435 | 2351 | |
duke@435 | 2352 | void JavaThread::nmethods_do() { |
duke@435 | 2353 | // Traverse the GCHandles |
duke@435 | 2354 | Thread::nmethods_do(); |
duke@435 | 2355 | |
duke@435 | 2356 | assert( (!has_last_Java_frame() && java_call_counter() == 0) || |
duke@435 | 2357 | (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); |
duke@435 | 2358 | |
duke@435 | 2359 | if (has_last_Java_frame()) { |
duke@435 | 2360 | // Traverse the execution stack |
duke@435 | 2361 | for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
duke@435 | 2362 | fst.current()->nmethods_do(); |
duke@435 | 2363 | } |
duke@435 | 2364 | } |
duke@435 | 2365 | } |
duke@435 | 2366 | |
duke@435 | 2367 | // Printing |
duke@435 | 2368 | const char* _get_thread_state_name(JavaThreadState _thread_state) { |
duke@435 | 2369 | switch (_thread_state) { |
duke@435 | 2370 | case _thread_uninitialized: return "_thread_uninitialized"; |
duke@435 | 2371 | case _thread_new: return "_thread_new"; |
duke@435 | 2372 | case _thread_new_trans: return "_thread_new_trans"; |
duke@435 | 2373 | case _thread_in_native: return "_thread_in_native"; |
duke@435 | 2374 | case _thread_in_native_trans: return "_thread_in_native_trans"; |
duke@435 | 2375 | case _thread_in_vm: return "_thread_in_vm"; |
duke@435 | 2376 | case _thread_in_vm_trans: return "_thread_in_vm_trans"; |
duke@435 | 2377 | case _thread_in_Java: return "_thread_in_Java"; |
duke@435 | 2378 | case _thread_in_Java_trans: return "_thread_in_Java_trans"; |
duke@435 | 2379 | case _thread_blocked: return "_thread_blocked"; |
duke@435 | 2380 | case _thread_blocked_trans: return "_thread_blocked_trans"; |
duke@435 | 2381 | default: return "unknown thread state"; |
duke@435 | 2382 | } |
duke@435 | 2383 | } |
duke@435 | 2384 | |
duke@435 | 2385 | #ifndef PRODUCT |
duke@435 | 2386 | void JavaThread::print_thread_state_on(outputStream *st) const { |
duke@435 | 2387 | st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); |
duke@435 | 2388 | }; |
duke@435 | 2389 | void JavaThread::print_thread_state() const { |
duke@435 | 2390 | print_thread_state_on(tty); |
duke@435 | 2391 | }; |
duke@435 | 2392 | #endif // PRODUCT |
duke@435 | 2393 | |
duke@435 | 2394 | // Called by Threads::print() for VM_PrintThreads operation |
duke@435 | 2395 | void JavaThread::print_on(outputStream *st) const { |
duke@435 | 2396 | st->print("\"%s\" ", get_thread_name()); |
duke@435 | 2397 | oop thread_oop = threadObj(); |
duke@435 | 2398 | if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); |
duke@435 | 2399 | Thread::print_on(st); |
duke@435 | 2400 | // print guess for valid stack memory region (assume 4K pages); helps lock debugging |
duke@435 | 2401 | st->print_cr("[" INTPTR_FORMAT ".." INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12), highest_lock()); |
duke@435 | 2402 | if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
duke@435 | 2403 | st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); |
duke@435 | 2404 | } |
duke@435 | 2405 | #ifndef PRODUCT |
duke@435 | 2406 | print_thread_state_on(st); |
duke@435 | 2407 | _safepoint_state->print_on(st); |
duke@435 | 2408 | #endif // PRODUCT |
duke@435 | 2409 | } |
duke@435 | 2410 | |
duke@435 | 2411 | // Called by fatal error handler. The difference between this and |
duke@435 | 2412 | // JavaThread::print() is that we can't grab lock or allocate memory. |
duke@435 | 2413 | void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { |
duke@435 | 2414 | st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); |
duke@435 | 2415 | oop thread_obj = threadObj(); |
duke@435 | 2416 | if (thread_obj != NULL) { |
duke@435 | 2417 | if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); |
duke@435 | 2418 | } |
duke@435 | 2419 | st->print(" ["); |
duke@435 | 2420 | st->print("%s", _get_thread_state_name(_thread_state)); |
duke@435 | 2421 | if (osthread()) { |
duke@435 | 2422 | st->print(", id=%d", osthread()->thread_id()); |
duke@435 | 2423 | } |
duke@435 | 2424 | st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", |
duke@435 | 2425 | _stack_base - _stack_size, _stack_base); |
duke@435 | 2426 | st->print("]"); |
duke@435 | 2427 | return; |
duke@435 | 2428 | } |
duke@435 | 2429 | |
duke@435 | 2430 | // Verification |
duke@435 | 2431 | |
duke@435 | 2432 | static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } |
duke@435 | 2433 | |
duke@435 | 2434 | void JavaThread::verify() { |
duke@435 | 2435 | // Verify oops in the thread. |
duke@435 | 2436 | oops_do(&VerifyOopClosure::verify_oop); |
duke@435 | 2437 | |
duke@435 | 2438 | // Verify the stack frames. |
duke@435 | 2439 | frames_do(frame_verify); |
duke@435 | 2440 | } |
duke@435 | 2441 | |
duke@435 | 2442 | // CR 6300358 (sub-CR 2137150) |
duke@435 | 2443 | // Most callers of this method assume that it can't return NULL but a |
duke@435 | 2444 | // thread may not have a name whilst it is in the process of attaching to |
duke@435 | 2445 | // the VM - see CR 6412693, and there are places where a JavaThread can be |
duke@435 | 2446 | // seen prior to having it's threadObj set (eg JNI attaching threads and |
duke@435 | 2447 | // if vm exit occurs during initialization). These cases can all be accounted |
duke@435 | 2448 | // for such that this method never returns NULL. |
duke@435 | 2449 | const char* JavaThread::get_thread_name() const { |
duke@435 | 2450 | #ifdef ASSERT |
duke@435 | 2451 | // early safepoints can hit while current thread does not yet have TLS |
duke@435 | 2452 | if (!SafepointSynchronize::is_at_safepoint()) { |
duke@435 | 2453 | Thread *cur = Thread::current(); |
duke@435 | 2454 | if (!(cur->is_Java_thread() && cur == this)) { |
duke@435 | 2455 | // Current JavaThreads are allowed to get their own name without |
duke@435 | 2456 | // the Threads_lock. |
duke@435 | 2457 | assert_locked_or_safepoint(Threads_lock); |
duke@435 | 2458 | } |
duke@435 | 2459 | } |
duke@435 | 2460 | #endif // ASSERT |
duke@435 | 2461 | return get_thread_name_string(); |
duke@435 | 2462 | } |
duke@435 | 2463 | |
duke@435 | 2464 | // Returns a non-NULL representation of this thread's name, or a suitable |
duke@435 | 2465 | // descriptive string if there is no set name |
duke@435 | 2466 | const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { |
duke@435 | 2467 | const char* name_str; |
duke@435 | 2468 | oop thread_obj = threadObj(); |
duke@435 | 2469 | if (thread_obj != NULL) { |
duke@435 | 2470 | typeArrayOop name = java_lang_Thread::name(thread_obj); |
duke@435 | 2471 | if (name != NULL) { |
duke@435 | 2472 | if (buf == NULL) { |
duke@435 | 2473 | name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); |
duke@435 | 2474 | } |
duke@435 | 2475 | else { |
duke@435 | 2476 | name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); |
duke@435 | 2477 | } |
duke@435 | 2478 | } |
duke@435 | 2479 | else if (is_attaching()) { // workaround for 6412693 - see 6404306 |
duke@435 | 2480 | name_str = "<no-name - thread is attaching>"; |
duke@435 | 2481 | } |
duke@435 | 2482 | else { |
duke@435 | 2483 | name_str = Thread::name(); |
duke@435 | 2484 | } |
duke@435 | 2485 | } |
duke@435 | 2486 | else { |
duke@435 | 2487 | name_str = Thread::name(); |
duke@435 | 2488 | } |
duke@435 | 2489 | assert(name_str != NULL, "unexpected NULL thread name"); |
duke@435 | 2490 | return name_str; |
duke@435 | 2491 | } |
duke@435 | 2492 | |
duke@435 | 2493 | |
duke@435 | 2494 | const char* JavaThread::get_threadgroup_name() const { |
duke@435 | 2495 | debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) |
duke@435 | 2496 | oop thread_obj = threadObj(); |
duke@435 | 2497 | if (thread_obj != NULL) { |
duke@435 | 2498 | oop thread_group = java_lang_Thread::threadGroup(thread_obj); |
duke@435 | 2499 | if (thread_group != NULL) { |
duke@435 | 2500 | typeArrayOop name = java_lang_ThreadGroup::name(thread_group); |
duke@435 | 2501 | // ThreadGroup.name can be null |
duke@435 | 2502 | if (name != NULL) { |
duke@435 | 2503 | const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); |
duke@435 | 2504 | return str; |
duke@435 | 2505 | } |
duke@435 | 2506 | } |
duke@435 | 2507 | } |
duke@435 | 2508 | return NULL; |
duke@435 | 2509 | } |
duke@435 | 2510 | |
duke@435 | 2511 | const char* JavaThread::get_parent_name() const { |
duke@435 | 2512 | debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) |
duke@435 | 2513 | oop thread_obj = threadObj(); |
duke@435 | 2514 | if (thread_obj != NULL) { |
duke@435 | 2515 | oop thread_group = java_lang_Thread::threadGroup(thread_obj); |
duke@435 | 2516 | if (thread_group != NULL) { |
duke@435 | 2517 | oop parent = java_lang_ThreadGroup::parent(thread_group); |
duke@435 | 2518 | if (parent != NULL) { |
duke@435 | 2519 | typeArrayOop name = java_lang_ThreadGroup::name(parent); |
duke@435 | 2520 | // ThreadGroup.name can be null |
duke@435 | 2521 | if (name != NULL) { |
duke@435 | 2522 | const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); |
duke@435 | 2523 | return str; |
duke@435 | 2524 | } |
duke@435 | 2525 | } |
duke@435 | 2526 | } |
duke@435 | 2527 | } |
duke@435 | 2528 | return NULL; |
duke@435 | 2529 | } |
duke@435 | 2530 | |
duke@435 | 2531 | ThreadPriority JavaThread::java_priority() const { |
duke@435 | 2532 | oop thr_oop = threadObj(); |
duke@435 | 2533 | if (thr_oop == NULL) return NormPriority; // Bootstrapping |
duke@435 | 2534 | ThreadPriority priority = java_lang_Thread::priority(thr_oop); |
duke@435 | 2535 | assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); |
duke@435 | 2536 | return priority; |
duke@435 | 2537 | } |
duke@435 | 2538 | |
duke@435 | 2539 | void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { |
duke@435 | 2540 | |
duke@435 | 2541 | assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); |
duke@435 | 2542 | // Link Java Thread object <-> C++ Thread |
duke@435 | 2543 | |
duke@435 | 2544 | // Get the C++ thread object (an oop) from the JNI handle (a jthread) |
duke@435 | 2545 | // and put it into a new Handle. The Handle "thread_oop" can then |
duke@435 | 2546 | // be used to pass the C++ thread object to other methods. |
duke@435 | 2547 | |
duke@435 | 2548 | // Set the Java level thread object (jthread) field of the |
duke@435 | 2549 | // new thread (a JavaThread *) to C++ thread object using the |
duke@435 | 2550 | // "thread_oop" handle. |
duke@435 | 2551 | |
duke@435 | 2552 | // Set the thread field (a JavaThread *) of the |
duke@435 | 2553 | // oop representing the java_lang_Thread to the new thread (a JavaThread *). |
duke@435 | 2554 | |
duke@435 | 2555 | Handle thread_oop(Thread::current(), |
duke@435 | 2556 | JNIHandles::resolve_non_null(jni_thread)); |
duke@435 | 2557 | assert(instanceKlass::cast(thread_oop->klass())->is_linked(), |
duke@435 | 2558 | "must be initialized"); |
duke@435 | 2559 | set_threadObj(thread_oop()); |
duke@435 | 2560 | java_lang_Thread::set_thread(thread_oop(), this); |
duke@435 | 2561 | |
duke@435 | 2562 | if (prio == NoPriority) { |
duke@435 | 2563 | prio = java_lang_Thread::priority(thread_oop()); |
duke@435 | 2564 | assert(prio != NoPriority, "A valid priority should be present"); |
duke@435 | 2565 | } |
duke@435 | 2566 | |
duke@435 | 2567 | // Push the Java priority down to the native thread; needs Threads_lock |
duke@435 | 2568 | Thread::set_priority(this, prio); |
duke@435 | 2569 | |
duke@435 | 2570 | // Add the new thread to the Threads list and set it in motion. |
duke@435 | 2571 | // We must have threads lock in order to call Threads::add. |
duke@435 | 2572 | // It is crucial that we do not block before the thread is |
duke@435 | 2573 | // added to the Threads list for if a GC happens, then the java_thread oop |
duke@435 | 2574 | // will not be visited by GC. |
duke@435 | 2575 | Threads::add(this); |
duke@435 | 2576 | } |
duke@435 | 2577 | |
duke@435 | 2578 | oop JavaThread::current_park_blocker() { |
duke@435 | 2579 | // Support for JSR-166 locks |
duke@435 | 2580 | oop thread_oop = threadObj(); |
duke@435 | 2581 | if (thread_oop != NULL && JDK_Version::supports_thread_park_blocker()) { |
duke@435 | 2582 | return java_lang_Thread::park_blocker(thread_oop); |
duke@435 | 2583 | } |
duke@435 | 2584 | return NULL; |
duke@435 | 2585 | } |
duke@435 | 2586 | |
duke@435 | 2587 | |
duke@435 | 2588 | void JavaThread::print_stack_on(outputStream* st) { |
duke@435 | 2589 | if (!has_last_Java_frame()) return; |
duke@435 | 2590 | ResourceMark rm; |
duke@435 | 2591 | HandleMark hm; |
duke@435 | 2592 | |
duke@435 | 2593 | RegisterMap reg_map(this); |
duke@435 | 2594 | vframe* start_vf = last_java_vframe(®_map); |
duke@435 | 2595 | int count = 0; |
duke@435 | 2596 | for (vframe* f = start_vf; f; f = f->sender() ) { |
duke@435 | 2597 | if (f->is_java_frame()) { |
duke@435 | 2598 | javaVFrame* jvf = javaVFrame::cast(f); |
duke@435 | 2599 | java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); |
duke@435 | 2600 | |
duke@435 | 2601 | // Print out lock information |
duke@435 | 2602 | if (JavaMonitorsInStackTrace) { |
duke@435 | 2603 | jvf->print_lock_info_on(st, count); |
duke@435 | 2604 | } |
duke@435 | 2605 | } else { |
duke@435 | 2606 | // Ignore non-Java frames |
duke@435 | 2607 | } |
duke@435 | 2608 | |
duke@435 | 2609 | // Bail-out case for too deep stacks |
duke@435 | 2610 | count++; |
duke@435 | 2611 | if (MaxJavaStackTraceDepth == count) return; |
duke@435 | 2612 | } |
duke@435 | 2613 | } |
duke@435 | 2614 | |
duke@435 | 2615 | |
duke@435 | 2616 | // JVMTI PopFrame support |
duke@435 | 2617 | void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { |
duke@435 | 2618 | assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); |
duke@435 | 2619 | if (in_bytes(size_in_bytes) != 0) { |
duke@435 | 2620 | _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); |
duke@435 | 2621 | _popframe_preserved_args_size = in_bytes(size_in_bytes); |
duke@435 | 2622 | Copy::conjoint_bytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
duke@435 | 2623 | } |
duke@435 | 2624 | } |
duke@435 | 2625 | |
duke@435 | 2626 | void* JavaThread::popframe_preserved_args() { |
duke@435 | 2627 | return _popframe_preserved_args; |
duke@435 | 2628 | } |
duke@435 | 2629 | |
duke@435 | 2630 | ByteSize JavaThread::popframe_preserved_args_size() { |
duke@435 | 2631 | return in_ByteSize(_popframe_preserved_args_size); |
duke@435 | 2632 | } |
duke@435 | 2633 | |
duke@435 | 2634 | WordSize JavaThread::popframe_preserved_args_size_in_words() { |
duke@435 | 2635 | int sz = in_bytes(popframe_preserved_args_size()); |
duke@435 | 2636 | assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); |
duke@435 | 2637 | return in_WordSize(sz / wordSize); |
duke@435 | 2638 | } |
duke@435 | 2639 | |
duke@435 | 2640 | void JavaThread::popframe_free_preserved_args() { |
duke@435 | 2641 | assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); |
duke@435 | 2642 | FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); |
duke@435 | 2643 | _popframe_preserved_args = NULL; |
duke@435 | 2644 | _popframe_preserved_args_size = 0; |
duke@435 | 2645 | } |
duke@435 | 2646 | |
duke@435 | 2647 | #ifndef PRODUCT |
duke@435 | 2648 | |
duke@435 | 2649 | void JavaThread::trace_frames() { |
duke@435 | 2650 | tty->print_cr("[Describe stack]"); |
duke@435 | 2651 | int frame_no = 1; |
duke@435 | 2652 | for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
duke@435 | 2653 | tty->print(" %d. ", frame_no++); |
duke@435 | 2654 | fst.current()->print_value_on(tty,this); |
duke@435 | 2655 | tty->cr(); |
duke@435 | 2656 | } |
duke@435 | 2657 | } |
duke@435 | 2658 | |
duke@435 | 2659 | |
duke@435 | 2660 | void JavaThread::trace_stack_from(vframe* start_vf) { |
duke@435 | 2661 | ResourceMark rm; |
duke@435 | 2662 | int vframe_no = 1; |
duke@435 | 2663 | for (vframe* f = start_vf; f; f = f->sender() ) { |
duke@435 | 2664 | if (f->is_java_frame()) { |
duke@435 | 2665 | javaVFrame::cast(f)->print_activation(vframe_no++); |
duke@435 | 2666 | } else { |
duke@435 | 2667 | f->print(); |
duke@435 | 2668 | } |
duke@435 | 2669 | if (vframe_no > StackPrintLimit) { |
duke@435 | 2670 | tty->print_cr("...<more frames>..."); |
duke@435 | 2671 | return; |
duke@435 | 2672 | } |
duke@435 | 2673 | } |
duke@435 | 2674 | } |
duke@435 | 2675 | |
duke@435 | 2676 | |
duke@435 | 2677 | void JavaThread::trace_stack() { |
duke@435 | 2678 | if (!has_last_Java_frame()) return; |
duke@435 | 2679 | ResourceMark rm; |
duke@435 | 2680 | HandleMark hm; |
duke@435 | 2681 | RegisterMap reg_map(this); |
duke@435 | 2682 | trace_stack_from(last_java_vframe(®_map)); |
duke@435 | 2683 | } |
duke@435 | 2684 | |
duke@435 | 2685 | |
duke@435 | 2686 | #endif // PRODUCT |
duke@435 | 2687 | |
duke@435 | 2688 | |
duke@435 | 2689 | javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { |
duke@435 | 2690 | assert(reg_map != NULL, "a map must be given"); |
duke@435 | 2691 | frame f = last_frame(); |
duke@435 | 2692 | for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { |
duke@435 | 2693 | if (vf->is_java_frame()) return javaVFrame::cast(vf); |
duke@435 | 2694 | } |
duke@435 | 2695 | return NULL; |
duke@435 | 2696 | } |
duke@435 | 2697 | |
duke@435 | 2698 | |
duke@435 | 2699 | klassOop JavaThread::security_get_caller_class(int depth) { |
duke@435 | 2700 | vframeStream vfst(this); |
duke@435 | 2701 | vfst.security_get_caller_frame(depth); |
duke@435 | 2702 | if (!vfst.at_end()) { |
duke@435 | 2703 | return vfst.method()->method_holder(); |
duke@435 | 2704 | } |
duke@435 | 2705 | return NULL; |
duke@435 | 2706 | } |
duke@435 | 2707 | |
duke@435 | 2708 | static void compiler_thread_entry(JavaThread* thread, TRAPS) { |
duke@435 | 2709 | assert(thread->is_Compiler_thread(), "must be compiler thread"); |
duke@435 | 2710 | CompileBroker::compiler_thread_loop(); |
duke@435 | 2711 | } |
duke@435 | 2712 | |
duke@435 | 2713 | // Create a CompilerThread |
duke@435 | 2714 | CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) |
duke@435 | 2715 | : JavaThread(&compiler_thread_entry) { |
duke@435 | 2716 | _env = NULL; |
duke@435 | 2717 | _log = NULL; |
duke@435 | 2718 | _task = NULL; |
duke@435 | 2719 | _queue = queue; |
duke@435 | 2720 | _counters = counters; |
duke@435 | 2721 | |
duke@435 | 2722 | #ifndef PRODUCT |
duke@435 | 2723 | _ideal_graph_printer = NULL; |
duke@435 | 2724 | #endif |
duke@435 | 2725 | } |
duke@435 | 2726 | |
duke@435 | 2727 | |
duke@435 | 2728 | // ======= Threads ======== |
duke@435 | 2729 | |
duke@435 | 2730 | // The Threads class links together all active threads, and provides |
duke@435 | 2731 | // operations over all threads. It is protected by its own Mutex |
duke@435 | 2732 | // lock, which is also used in other contexts to protect thread |
duke@435 | 2733 | // operations from having the thread being operated on from exiting |
duke@435 | 2734 | // and going away unexpectedly (e.g., safepoint synchronization) |
duke@435 | 2735 | |
duke@435 | 2736 | JavaThread* Threads::_thread_list = NULL; |
duke@435 | 2737 | int Threads::_number_of_threads = 0; |
duke@435 | 2738 | int Threads::_number_of_non_daemon_threads = 0; |
duke@435 | 2739 | int Threads::_return_code = 0; |
duke@435 | 2740 | size_t JavaThread::_stack_size_at_create = 0; |
duke@435 | 2741 | |
duke@435 | 2742 | // All JavaThreads |
duke@435 | 2743 | #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) |
duke@435 | 2744 | |
duke@435 | 2745 | void os_stream(); |
duke@435 | 2746 | |
duke@435 | 2747 | // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) |
duke@435 | 2748 | void Threads::threads_do(ThreadClosure* tc) { |
duke@435 | 2749 | assert_locked_or_safepoint(Threads_lock); |
duke@435 | 2750 | // ALL_JAVA_THREADS iterates through all JavaThreads |
duke@435 | 2751 | ALL_JAVA_THREADS(p) { |
duke@435 | 2752 | tc->do_thread(p); |
duke@435 | 2753 | } |
duke@435 | 2754 | // Someday we could have a table or list of all non-JavaThreads. |
duke@435 | 2755 | // For now, just manually iterate through them. |
duke@435 | 2756 | tc->do_thread(VMThread::vm_thread()); |
duke@435 | 2757 | Universe::heap()->gc_threads_do(tc); |
duke@435 | 2758 | tc->do_thread(WatcherThread::watcher_thread()); |
duke@435 | 2759 | // If CompilerThreads ever become non-JavaThreads, add them here |
duke@435 | 2760 | } |
duke@435 | 2761 | |
duke@435 | 2762 | jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { |
duke@435 | 2763 | |
duke@435 | 2764 | // Check version |
duke@435 | 2765 | if (!is_supported_jni_version(args->version)) return JNI_EVERSION; |
duke@435 | 2766 | |
duke@435 | 2767 | // Initialize the output stream module |
duke@435 | 2768 | ostream_init(); |
duke@435 | 2769 | |
duke@435 | 2770 | // Process java launcher properties. |
duke@435 | 2771 | Arguments::process_sun_java_launcher_properties(args); |
duke@435 | 2772 | |
duke@435 | 2773 | // Initialize the os module before using TLS |
duke@435 | 2774 | os::init(); |
duke@435 | 2775 | |
duke@435 | 2776 | // Initialize system properties. |
duke@435 | 2777 | Arguments::init_system_properties(); |
duke@435 | 2778 | |
duke@435 | 2779 | // Parse arguments |
duke@435 | 2780 | jint parse_result = Arguments::parse(args); |
duke@435 | 2781 | if (parse_result != JNI_OK) return parse_result; |
duke@435 | 2782 | |
duke@435 | 2783 | if (PauseAtStartup) { |
duke@435 | 2784 | os::pause(); |
duke@435 | 2785 | } |
duke@435 | 2786 | |
duke@435 | 2787 | HS_DTRACE_PROBE(hotspot, vm__init__begin); |
duke@435 | 2788 | |
duke@435 | 2789 | // Record VM creation timing statistics |
duke@435 | 2790 | TraceVmCreationTime create_vm_timer; |
duke@435 | 2791 | create_vm_timer.start(); |
duke@435 | 2792 | |
duke@435 | 2793 | // Timing (must come after argument parsing) |
duke@435 | 2794 | TraceTime timer("Create VM", TraceStartupTime); |
duke@435 | 2795 | |
duke@435 | 2796 | // Initialize the os module after parsing the args |
duke@435 | 2797 | jint os_init_2_result = os::init_2(); |
duke@435 | 2798 | if (os_init_2_result != JNI_OK) return os_init_2_result; |
duke@435 | 2799 | |
duke@435 | 2800 | // Initialize output stream logging |
duke@435 | 2801 | ostream_init_log(); |
duke@435 | 2802 | |
duke@435 | 2803 | // Convert -Xrun to -agentlib: if there is no JVM_OnLoad |
duke@435 | 2804 | // Must be before create_vm_init_agents() |
duke@435 | 2805 | if (Arguments::init_libraries_at_startup()) { |
duke@435 | 2806 | convert_vm_init_libraries_to_agents(); |
duke@435 | 2807 | } |
duke@435 | 2808 | |
duke@435 | 2809 | // Launch -agentlib/-agentpath and converted -Xrun agents |
duke@435 | 2810 | if (Arguments::init_agents_at_startup()) { |
duke@435 | 2811 | create_vm_init_agents(); |
duke@435 | 2812 | } |
duke@435 | 2813 | |
duke@435 | 2814 | // Initialize Threads state |
duke@435 | 2815 | _thread_list = NULL; |
duke@435 | 2816 | _number_of_threads = 0; |
duke@435 | 2817 | _number_of_non_daemon_threads = 0; |
duke@435 | 2818 | |
duke@435 | 2819 | // Initialize TLS |
duke@435 | 2820 | ThreadLocalStorage::init(); |
duke@435 | 2821 | |
duke@435 | 2822 | // Initialize global data structures and create system classes in heap |
duke@435 | 2823 | vm_init_globals(); |
duke@435 | 2824 | |
duke@435 | 2825 | // Attach the main thread to this os thread |
duke@435 | 2826 | JavaThread* main_thread = new JavaThread(); |
duke@435 | 2827 | main_thread->set_thread_state(_thread_in_vm); |
duke@435 | 2828 | // must do this before set_active_handles and initialize_thread_local_storage |
duke@435 | 2829 | // Note: on solaris initialize_thread_local_storage() will (indirectly) |
duke@435 | 2830 | // change the stack size recorded here to one based on the java thread |
duke@435 | 2831 | // stacksize. This adjusted size is what is used to figure the placement |
duke@435 | 2832 | // of the guard pages. |
duke@435 | 2833 | main_thread->record_stack_base_and_size(); |
duke@435 | 2834 | main_thread->initialize_thread_local_storage(); |
duke@435 | 2835 | |
duke@435 | 2836 | main_thread->set_active_handles(JNIHandleBlock::allocate_block()); |
duke@435 | 2837 | |
duke@435 | 2838 | if (!main_thread->set_as_starting_thread()) { |
duke@435 | 2839 | vm_shutdown_during_initialization( |
duke@435 | 2840 | "Failed necessary internal allocation. Out of swap space"); |
duke@435 | 2841 | delete main_thread; |
duke@435 | 2842 | *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again |
duke@435 | 2843 | return JNI_ENOMEM; |
duke@435 | 2844 | } |
duke@435 | 2845 | |
duke@435 | 2846 | // Enable guard page *after* os::create_main_thread(), otherwise it would |
duke@435 | 2847 | // crash Linux VM, see notes in os_linux.cpp. |
duke@435 | 2848 | main_thread->create_stack_guard_pages(); |
duke@435 | 2849 | |
duke@435 | 2850 | // Initialize Java-Leve synchronization subsystem |
duke@435 | 2851 | ObjectSynchronizer::Initialize() ; |
duke@435 | 2852 | |
duke@435 | 2853 | // Initialize global modules |
duke@435 | 2854 | jint status = init_globals(); |
duke@435 | 2855 | if (status != JNI_OK) { |
duke@435 | 2856 | delete main_thread; |
duke@435 | 2857 | *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again |
duke@435 | 2858 | return status; |
duke@435 | 2859 | } |
duke@435 | 2860 | |
duke@435 | 2861 | HandleMark hm; |
duke@435 | 2862 | |
duke@435 | 2863 | { MutexLocker mu(Threads_lock); |
duke@435 | 2864 | Threads::add(main_thread); |
duke@435 | 2865 | } |
duke@435 | 2866 | |
duke@435 | 2867 | // Any JVMTI raw monitors entered in onload will transition into |
duke@435 | 2868 | // real raw monitor. VM is setup enough here for raw monitor enter. |
duke@435 | 2869 | JvmtiExport::transition_pending_onload_raw_monitors(); |
duke@435 | 2870 | |
duke@435 | 2871 | if (VerifyBeforeGC && |
duke@435 | 2872 | Universe::heap()->total_collections() >= VerifyGCStartAt) { |
duke@435 | 2873 | Universe::heap()->prepare_for_verify(); |
duke@435 | 2874 | Universe::verify(); // make sure we're starting with a clean slate |
duke@435 | 2875 | } |
duke@435 | 2876 | |
duke@435 | 2877 | // Create the VMThread |
duke@435 | 2878 | { TraceTime timer("Start VMThread", TraceStartupTime); |
duke@435 | 2879 | VMThread::create(); |
duke@435 | 2880 | Thread* vmthread = VMThread::vm_thread(); |
duke@435 | 2881 | |
duke@435 | 2882 | if (!os::create_thread(vmthread, os::vm_thread)) |
duke@435 | 2883 | vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); |
duke@435 | 2884 | |
duke@435 | 2885 | // Wait for the VM thread to become ready, and VMThread::run to initialize |
duke@435 | 2886 | // Monitors can have spurious returns, must always check another state flag |
duke@435 | 2887 | { |
duke@435 | 2888 | MutexLocker ml(Notify_lock); |
duke@435 | 2889 | os::start_thread(vmthread); |
duke@435 | 2890 | while (vmthread->active_handles() == NULL) { |
duke@435 | 2891 | Notify_lock->wait(); |
duke@435 | 2892 | } |
duke@435 | 2893 | } |
duke@435 | 2894 | } |
duke@435 | 2895 | |
duke@435 | 2896 | assert (Universe::is_fully_initialized(), "not initialized"); |
duke@435 | 2897 | EXCEPTION_MARK; |
duke@435 | 2898 | |
duke@435 | 2899 | // At this point, the Universe is initialized, but we have not executed |
duke@435 | 2900 | // any byte code. Now is a good time (the only time) to dump out the |
duke@435 | 2901 | // internal state of the JVM for sharing. |
duke@435 | 2902 | |
duke@435 | 2903 | if (DumpSharedSpaces) { |
duke@435 | 2904 | Universe::heap()->preload_and_dump(CHECK_0); |
duke@435 | 2905 | ShouldNotReachHere(); |
duke@435 | 2906 | } |
duke@435 | 2907 | |
duke@435 | 2908 | // Always call even when there are not JVMTI environments yet, since environments |
duke@435 | 2909 | // may be attached late and JVMTI must track phases of VM execution |
duke@435 | 2910 | JvmtiExport::enter_start_phase(); |
duke@435 | 2911 | |
duke@435 | 2912 | // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. |
duke@435 | 2913 | JvmtiExport::post_vm_start(); |
duke@435 | 2914 | |
duke@435 | 2915 | { |
duke@435 | 2916 | TraceTime timer("Initialize java.lang classes", TraceStartupTime); |
duke@435 | 2917 | |
duke@435 | 2918 | if (EagerXrunInit && Arguments::init_libraries_at_startup()) { |
duke@435 | 2919 | create_vm_init_libraries(); |
duke@435 | 2920 | } |
duke@435 | 2921 | |
duke@435 | 2922 | if (InitializeJavaLangString) { |
duke@435 | 2923 | initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0); |
duke@435 | 2924 | } else { |
duke@435 | 2925 | warning("java.lang.String not initialized"); |
duke@435 | 2926 | } |
duke@435 | 2927 | |
duke@435 | 2928 | // Initialize java_lang.System (needed before creating the thread) |
duke@435 | 2929 | if (InitializeJavaLangSystem) { |
duke@435 | 2930 | initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0); |
duke@435 | 2931 | initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0); |
duke@435 | 2932 | Handle thread_group = create_initial_thread_group(CHECK_0); |
duke@435 | 2933 | Universe::set_main_thread_group(thread_group()); |
duke@435 | 2934 | initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0); |
duke@435 | 2935 | oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
duke@435 | 2936 | main_thread->set_threadObj(thread_object); |
duke@435 | 2937 | // Set thread status to running since main thread has |
duke@435 | 2938 | // been started and running. |
duke@435 | 2939 | java_lang_Thread::set_thread_status(thread_object, |
duke@435 | 2940 | java_lang_Thread::RUNNABLE); |
duke@435 | 2941 | |
duke@435 | 2942 | // The VM preresolve methods to these classes. Make sure that get initialized |
duke@435 | 2943 | initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0); |
duke@435 | 2944 | initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0); |
duke@435 | 2945 | // The VM creates & returns objects of this class. Make sure it's initialized. |
duke@435 | 2946 | initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0); |
duke@435 | 2947 | call_initializeSystemClass(CHECK_0); |
duke@435 | 2948 | } else { |
duke@435 | 2949 | warning("java.lang.System not initialized"); |
duke@435 | 2950 | } |
duke@435 | 2951 | |
duke@435 | 2952 | // an instance of OutOfMemory exception has been allocated earlier |
duke@435 | 2953 | if (InitializeJavaLangExceptionsErrors) { |
duke@435 | 2954 | initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0); |
duke@435 | 2955 | initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0); |
duke@435 | 2956 | initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0); |
duke@435 | 2957 | initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0); |
duke@435 | 2958 | initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0); |
duke@435 | 2959 | initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0); |
duke@435 | 2960 | initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0); |
duke@435 | 2961 | } else { |
duke@435 | 2962 | warning("java.lang.OutOfMemoryError has not been initialized"); |
duke@435 | 2963 | warning("java.lang.NullPointerException has not been initialized"); |
duke@435 | 2964 | warning("java.lang.ClassCastException has not been initialized"); |
duke@435 | 2965 | warning("java.lang.ArrayStoreException has not been initialized"); |
duke@435 | 2966 | warning("java.lang.ArithmeticException has not been initialized"); |
duke@435 | 2967 | warning("java.lang.StackOverflowError has not been initialized"); |
duke@435 | 2968 | } |
duke@435 | 2969 | } |
duke@435 | 2970 | |
duke@435 | 2971 | // See : bugid 4211085. |
duke@435 | 2972 | // Background : the static initializer of java.lang.Compiler tries to read |
duke@435 | 2973 | // property"java.compiler" and read & write property "java.vm.info". |
duke@435 | 2974 | // When a security manager is installed through the command line |
duke@435 | 2975 | // option "-Djava.security.manager", the above properties are not |
duke@435 | 2976 | // readable and the static initializer for java.lang.Compiler fails |
duke@435 | 2977 | // resulting in a NoClassDefFoundError. This can happen in any |
duke@435 | 2978 | // user code which calls methods in java.lang.Compiler. |
duke@435 | 2979 | // Hack : the hack is to pre-load and initialize this class, so that only |
duke@435 | 2980 | // system domains are on the stack when the properties are read. |
duke@435 | 2981 | // Currently even the AWT code has calls to methods in java.lang.Compiler. |
duke@435 | 2982 | // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. |
duke@435 | 2983 | // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and |
duke@435 | 2984 | // read and write"java.vm.info" in the default policy file. See bugid 4211383 |
duke@435 | 2985 | // Once that is done, we should remove this hack. |
duke@435 | 2986 | initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0); |
duke@435 | 2987 | |
duke@435 | 2988 | // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to |
duke@435 | 2989 | // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot |
duke@435 | 2990 | // compiler does not get loaded through java.lang.Compiler). "java -version" with the |
duke@435 | 2991 | // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. |
duke@435 | 2992 | // This should also be taken out as soon as 4211383 gets fixed. |
duke@435 | 2993 | reset_vm_info_property(CHECK_0); |
duke@435 | 2994 | |
duke@435 | 2995 | quicken_jni_functions(); |
duke@435 | 2996 | |
duke@435 | 2997 | // Set flag that basic initialization has completed. Used by exceptions and various |
duke@435 | 2998 | // debug stuff, that does not work until all basic classes have been initialized. |
duke@435 | 2999 | set_init_completed(); |
duke@435 | 3000 | |
duke@435 | 3001 | HS_DTRACE_PROBE(hotspot, vm__init__end); |
duke@435 | 3002 | |
duke@435 | 3003 | // record VM initialization completion time |
duke@435 | 3004 | Management::record_vm_init_completed(); |
duke@435 | 3005 | |
duke@435 | 3006 | // Compute system loader. Note that this has to occur after set_init_completed, since |
duke@435 | 3007 | // valid exceptions may be thrown in the process. |
duke@435 | 3008 | // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and |
duke@435 | 3009 | // set_init_completed has just been called, causing exceptions not to be shortcut |
duke@435 | 3010 | // anymore. We call vm_exit_during_initialization directly instead. |
duke@435 | 3011 | SystemDictionary::compute_java_system_loader(THREAD); |
duke@435 | 3012 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 3013 | vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
duke@435 | 3014 | } |
duke@435 | 3015 | |
duke@435 | 3016 | #ifndef SERIALGC |
duke@435 | 3017 | // Support for ConcurrentMarkSweep. This should be cleaned up |
duke@435 | 3018 | // and better encapsulated. XXX YSR |
duke@435 | 3019 | if (UseConcMarkSweepGC) { |
duke@435 | 3020 | ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
duke@435 | 3021 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 3022 | vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
duke@435 | 3023 | } |
duke@435 | 3024 | } |
duke@435 | 3025 | #endif // SERIALGC |
duke@435 | 3026 | |
duke@435 | 3027 | // Always call even when there are not JVMTI environments yet, since environments |
duke@435 | 3028 | // may be attached late and JVMTI must track phases of VM execution |
duke@435 | 3029 | JvmtiExport::enter_live_phase(); |
duke@435 | 3030 | |
duke@435 | 3031 | // Signal Dispatcher needs to be started before VMInit event is posted |
duke@435 | 3032 | os::signal_init(); |
duke@435 | 3033 | |
duke@435 | 3034 | // Start Attach Listener if +StartAttachListener or it can't be started lazily |
duke@435 | 3035 | if (!DisableAttachMechanism) { |
duke@435 | 3036 | if (StartAttachListener || AttachListener::init_at_startup()) { |
duke@435 | 3037 | AttachListener::init(); |
duke@435 | 3038 | } |
duke@435 | 3039 | } |
duke@435 | 3040 | |
duke@435 | 3041 | // Launch -Xrun agents |
duke@435 | 3042 | // Must be done in the JVMTI live phase so that for backward compatibility the JDWP |
duke@435 | 3043 | // back-end can launch with -Xdebug -Xrunjdwp. |
duke@435 | 3044 | if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { |
duke@435 | 3045 | create_vm_init_libraries(); |
duke@435 | 3046 | } |
duke@435 | 3047 | |
duke@435 | 3048 | // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
duke@435 | 3049 | JvmtiExport::post_vm_initialized(); |
duke@435 | 3050 | |
duke@435 | 3051 | Chunk::start_chunk_pool_cleaner_task(); |
duke@435 | 3052 | |
duke@435 | 3053 | // initialize compiler(s) |
duke@435 | 3054 | CompileBroker::compilation_init(); |
duke@435 | 3055 | |
duke@435 | 3056 | Management::initialize(THREAD); |
duke@435 | 3057 | if (HAS_PENDING_EXCEPTION) { |
duke@435 | 3058 | // management agent fails to start possibly due to |
duke@435 | 3059 | // configuration problem and is responsible for printing |
duke@435 | 3060 | // stack trace if appropriate. Simply exit VM. |
duke@435 | 3061 | vm_exit(1); |
duke@435 | 3062 | } |
duke@435 | 3063 | |
duke@435 | 3064 | if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); |
duke@435 | 3065 | if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); |
duke@435 | 3066 | if (MemProfiling) MemProfiler::engage(); |
duke@435 | 3067 | StatSampler::engage(); |
duke@435 | 3068 | if (CheckJNICalls) JniPeriodicChecker::engage(); |
duke@435 | 3069 | if (CacheTimeMillis) TimeMillisUpdateTask::engage(); |
duke@435 | 3070 | |
duke@435 | 3071 | BiasedLocking::init(); |
duke@435 | 3072 | |
duke@435 | 3073 | |
duke@435 | 3074 | // Start up the WatcherThread if there are any periodic tasks |
duke@435 | 3075 | // NOTE: All PeriodicTasks should be registered by now. If they |
duke@435 | 3076 | // aren't, late joiners might appear to start slowly (we might |
duke@435 | 3077 | // take a while to process their first tick). |
duke@435 | 3078 | if (PeriodicTask::num_tasks() > 0) { |
duke@435 | 3079 | WatcherThread::start(); |
duke@435 | 3080 | } |
duke@435 | 3081 | |
duke@435 | 3082 | create_vm_timer.end(); |
duke@435 | 3083 | return JNI_OK; |
duke@435 | 3084 | } |
duke@435 | 3085 | |
duke@435 | 3086 | // type for the Agent_OnLoad and JVM_OnLoad entry points |
duke@435 | 3087 | extern "C" { |
duke@435 | 3088 | typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); |
duke@435 | 3089 | } |
duke@435 | 3090 | // Find a command line agent library and return its entry point for |
duke@435 | 3091 | // -agentlib: -agentpath: -Xrun |
duke@435 | 3092 | // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. |
duke@435 | 3093 | static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { |
duke@435 | 3094 | OnLoadEntry_t on_load_entry = NULL; |
duke@435 | 3095 | void *library = agent->os_lib(); // check if we have looked it up before |
duke@435 | 3096 | |
duke@435 | 3097 | if (library == NULL) { |
duke@435 | 3098 | char buffer[JVM_MAXPATHLEN]; |
duke@435 | 3099 | char ebuf[1024]; |
duke@435 | 3100 | const char *name = agent->name(); |
duke@435 | 3101 | |
duke@435 | 3102 | if (agent->is_absolute_path()) { |
duke@435 | 3103 | library = hpi::dll_load(name, ebuf, sizeof ebuf); |
duke@435 | 3104 | if (library == NULL) { |
duke@435 | 3105 | // If we can't find the agent, exit. |
duke@435 | 3106 | vm_exit_during_initialization("Could not find agent library in absolute path", name); |
duke@435 | 3107 | } |
duke@435 | 3108 | } else { |
duke@435 | 3109 | // Try to load the agent from the standard dll directory |
duke@435 | 3110 | hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
duke@435 | 3111 | library = hpi::dll_load(buffer, ebuf, sizeof ebuf); |
duke@435 | 3112 | #ifdef KERNEL |
duke@435 | 3113 | // Download instrument dll |
duke@435 | 3114 | if (library == NULL && strcmp(name, "instrument") == 0) { |
duke@435 | 3115 | char *props = Arguments::get_kernel_properties(); |
duke@435 | 3116 | char *home = Arguments::get_java_home(); |
duke@435 | 3117 | const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" |
duke@435 | 3118 | " sun.jkernel.DownloadManager -download client_jvm"; |
duke@435 | 3119 | int length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
duke@435 | 3120 | char *cmd = AllocateHeap(length); |
duke@435 | 3121 | jio_snprintf(cmd, length, fmt, home, props); |
duke@435 | 3122 | int status = os::fork_and_exec(cmd); |
duke@435 | 3123 | FreeHeap(props); |
duke@435 | 3124 | FreeHeap(cmd); |
duke@435 | 3125 | if (status == -1) { |
duke@435 | 3126 | warning(cmd); |
duke@435 | 3127 | vm_exit_during_initialization("fork_and_exec failed: %s", |
duke@435 | 3128 | strerror(errno)); |
duke@435 | 3129 | } |
duke@435 | 3130 | // when this comes back the instrument.dll should be where it belongs. |
duke@435 | 3131 | library = hpi::dll_load(buffer, ebuf, sizeof ebuf); |
duke@435 | 3132 | } |
duke@435 | 3133 | #endif // KERNEL |
duke@435 | 3134 | if (library == NULL) { // Try the local directory |
duke@435 | 3135 | char ns[1] = {0}; |
duke@435 | 3136 | hpi::dll_build_name(buffer, sizeof(buffer), ns, name); |
duke@435 | 3137 | library = hpi::dll_load(buffer, ebuf, sizeof ebuf); |
duke@435 | 3138 | if (library == NULL) { |
duke@435 | 3139 | // If we can't find the agent, exit. |
duke@435 | 3140 | vm_exit_during_initialization("Could not find agent library on the library path or in the local directory", name); |
duke@435 | 3141 | } |
duke@435 | 3142 | } |
duke@435 | 3143 | } |
duke@435 | 3144 | agent->set_os_lib(library); |
duke@435 | 3145 | } |
duke@435 | 3146 | |
duke@435 | 3147 | // Find the OnLoad function. |
duke@435 | 3148 | for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { |
duke@435 | 3149 | on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, hpi::dll_lookup(library, on_load_symbols[symbol_index])); |
duke@435 | 3150 | if (on_load_entry != NULL) break; |
duke@435 | 3151 | } |
duke@435 | 3152 | return on_load_entry; |
duke@435 | 3153 | } |
duke@435 | 3154 | |
duke@435 | 3155 | // Find the JVM_OnLoad entry point |
duke@435 | 3156 | static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { |
duke@435 | 3157 | const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; |
duke@435 | 3158 | return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); |
duke@435 | 3159 | } |
duke@435 | 3160 | |
duke@435 | 3161 | // Find the Agent_OnLoad entry point |
duke@435 | 3162 | static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { |
duke@435 | 3163 | const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; |
duke@435 | 3164 | return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); |
duke@435 | 3165 | } |
duke@435 | 3166 | |
duke@435 | 3167 | // For backwards compatibility with -Xrun |
duke@435 | 3168 | // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be |
duke@435 | 3169 | // treated like -agentpath: |
duke@435 | 3170 | // Must be called before agent libraries are created |
duke@435 | 3171 | void Threads::convert_vm_init_libraries_to_agents() { |
duke@435 | 3172 | AgentLibrary* agent; |
duke@435 | 3173 | AgentLibrary* next; |
duke@435 | 3174 | |
duke@435 | 3175 | for (agent = Arguments::libraries(); agent != NULL; agent = next) { |
duke@435 | 3176 | next = agent->next(); // cache the next agent now as this agent may get moved off this list |
duke@435 | 3177 | OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); |
duke@435 | 3178 | |
duke@435 | 3179 | // If there is an JVM_OnLoad function it will get called later, |
duke@435 | 3180 | // otherwise see if there is an Agent_OnLoad |
duke@435 | 3181 | if (on_load_entry == NULL) { |
duke@435 | 3182 | on_load_entry = lookup_agent_on_load(agent); |
duke@435 | 3183 | if (on_load_entry != NULL) { |
duke@435 | 3184 | // switch it to the agent list -- so that Agent_OnLoad will be called, |
duke@435 | 3185 | // JVM_OnLoad won't be attempted and Agent_OnUnload will |
duke@435 | 3186 | Arguments::convert_library_to_agent(agent); |
duke@435 | 3187 | } else { |
duke@435 | 3188 | vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); |
duke@435 | 3189 | } |
duke@435 | 3190 | } |
duke@435 | 3191 | } |
duke@435 | 3192 | } |
duke@435 | 3193 | |
duke@435 | 3194 | // Create agents for -agentlib: -agentpath: and converted -Xrun |
duke@435 | 3195 | // Invokes Agent_OnLoad |
duke@435 | 3196 | // Called very early -- before JavaThreads exist |
duke@435 | 3197 | void Threads::create_vm_init_agents() { |
duke@435 | 3198 | extern struct JavaVM_ main_vm; |
duke@435 | 3199 | AgentLibrary* agent; |
duke@435 | 3200 | |
duke@435 | 3201 | JvmtiExport::enter_onload_phase(); |
duke@435 | 3202 | for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
duke@435 | 3203 | OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); |
duke@435 | 3204 | |
duke@435 | 3205 | if (on_load_entry != NULL) { |
duke@435 | 3206 | // Invoke the Agent_OnLoad function |
duke@435 | 3207 | jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); |
duke@435 | 3208 | if (err != JNI_OK) { |
duke@435 | 3209 | vm_exit_during_initialization("agent library failed to init", agent->name()); |
duke@435 | 3210 | } |
duke@435 | 3211 | } else { |
duke@435 | 3212 | vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); |
duke@435 | 3213 | } |
duke@435 | 3214 | } |
duke@435 | 3215 | JvmtiExport::enter_primordial_phase(); |
duke@435 | 3216 | } |
duke@435 | 3217 | |
duke@435 | 3218 | extern "C" { |
duke@435 | 3219 | typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); |
duke@435 | 3220 | } |
duke@435 | 3221 | |
duke@435 | 3222 | void Threads::shutdown_vm_agents() { |
duke@435 | 3223 | // Send any Agent_OnUnload notifications |
duke@435 | 3224 | const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; |
duke@435 | 3225 | extern struct JavaVM_ main_vm; |
duke@435 | 3226 | for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
duke@435 | 3227 | |
duke@435 | 3228 | // Find the Agent_OnUnload function. |
duke@435 | 3229 | for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { |
duke@435 | 3230 | Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, |
duke@435 | 3231 | hpi::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
duke@435 | 3232 | |
duke@435 | 3233 | // Invoke the Agent_OnUnload function |
duke@435 | 3234 | if (unload_entry != NULL) { |
duke@435 | 3235 | JavaThread* thread = JavaThread::current(); |
duke@435 | 3236 | ThreadToNativeFromVM ttn(thread); |
duke@435 | 3237 | HandleMark hm(thread); |
duke@435 | 3238 | (*unload_entry)(&main_vm); |
duke@435 | 3239 | break; |
duke@435 | 3240 | } |
duke@435 | 3241 | } |
duke@435 | 3242 | } |
duke@435 | 3243 | } |
duke@435 | 3244 | |
duke@435 | 3245 | // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries |
duke@435 | 3246 | // Invokes JVM_OnLoad |
duke@435 | 3247 | void Threads::create_vm_init_libraries() { |
duke@435 | 3248 | extern struct JavaVM_ main_vm; |
duke@435 | 3249 | AgentLibrary* agent; |
duke@435 | 3250 | |
duke@435 | 3251 | for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { |
duke@435 | 3252 | OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); |
duke@435 | 3253 | |
duke@435 | 3254 | if (on_load_entry != NULL) { |
duke@435 | 3255 | // Invoke the JVM_OnLoad function |
duke@435 | 3256 | JavaThread* thread = JavaThread::current(); |
duke@435 | 3257 | ThreadToNativeFromVM ttn(thread); |
duke@435 | 3258 | HandleMark hm(thread); |
duke@435 | 3259 | jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); |
duke@435 | 3260 | if (err != JNI_OK) { |
duke@435 | 3261 | vm_exit_during_initialization("-Xrun library failed to init", agent->name()); |
duke@435 | 3262 | } |
duke@435 | 3263 | } else { |
duke@435 | 3264 | vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); |
duke@435 | 3265 | } |
duke@435 | 3266 | } |
duke@435 | 3267 | } |
duke@435 | 3268 | |
duke@435 | 3269 | // Last thread running calls java.lang.Shutdown.shutdown() |
duke@435 | 3270 | void JavaThread::invoke_shutdown_hooks() { |
duke@435 | 3271 | HandleMark hm(this); |
duke@435 | 3272 | |
duke@435 | 3273 | // We could get here with a pending exception, if so clear it now. |
duke@435 | 3274 | if (this->has_pending_exception()) { |
duke@435 | 3275 | this->clear_pending_exception(); |
duke@435 | 3276 | } |
duke@435 | 3277 | |
duke@435 | 3278 | EXCEPTION_MARK; |
duke@435 | 3279 | klassOop k = |
duke@435 | 3280 | SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), |
duke@435 | 3281 | THREAD); |
duke@435 | 3282 | if (k != NULL) { |
duke@435 | 3283 | // SystemDictionary::resolve_or_null will return null if there was |
duke@435 | 3284 | // an exception. If we cannot load the Shutdown class, just don't |
duke@435 | 3285 | // call Shutdown.shutdown() at all. This will mean the shutdown hooks |
duke@435 | 3286 | // and finalizers (if runFinalizersOnExit is set) won't be run. |
duke@435 | 3287 | // Note that if a shutdown hook was registered or runFinalizersOnExit |
duke@435 | 3288 | // was called, the Shutdown class would have already been loaded |
duke@435 | 3289 | // (Runtime.addShutdownHook and runFinalizersOnExit will load it). |
duke@435 | 3290 | instanceKlassHandle shutdown_klass (THREAD, k); |
duke@435 | 3291 | JavaValue result(T_VOID); |
duke@435 | 3292 | JavaCalls::call_static(&result, |
duke@435 | 3293 | shutdown_klass, |
duke@435 | 3294 | vmSymbolHandles::shutdown_method_name(), |
duke@435 | 3295 | vmSymbolHandles::void_method_signature(), |
duke@435 | 3296 | THREAD); |
duke@435 | 3297 | } |
duke@435 | 3298 | CLEAR_PENDING_EXCEPTION; |
duke@435 | 3299 | } |
duke@435 | 3300 | |
duke@435 | 3301 | // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when |
duke@435 | 3302 | // the program falls off the end of main(). Another VM exit path is through |
duke@435 | 3303 | // vm_exit() when the program calls System.exit() to return a value or when |
duke@435 | 3304 | // there is a serious error in VM. The two shutdown paths are not exactly |
duke@435 | 3305 | // the same, but they share Shutdown.shutdown() at Java level and before_exit() |
duke@435 | 3306 | // and VM_Exit op at VM level. |
duke@435 | 3307 | // |
duke@435 | 3308 | // Shutdown sequence: |
duke@435 | 3309 | // + Wait until we are the last non-daemon thread to execute |
duke@435 | 3310 | // <-- every thing is still working at this moment --> |
duke@435 | 3311 | // + Call java.lang.Shutdown.shutdown(), which will invoke Java level |
duke@435 | 3312 | // shutdown hooks, run finalizers if finalization-on-exit |
duke@435 | 3313 | // + Call before_exit(), prepare for VM exit |
duke@435 | 3314 | // > run VM level shutdown hooks (they are registered through JVM_OnExit(), |
duke@435 | 3315 | // currently the only user of this mechanism is File.deleteOnExit()) |
duke@435 | 3316 | // > stop flat profiler, StatSampler, watcher thread, CMS threads, |
duke@435 | 3317 | // post thread end and vm death events to JVMTI, |
duke@435 | 3318 | // stop signal thread |
duke@435 | 3319 | // + Call JavaThread::exit(), it will: |
duke@435 | 3320 | // > release JNI handle blocks, remove stack guard pages |
duke@435 | 3321 | // > remove this thread from Threads list |
duke@435 | 3322 | // <-- no more Java code from this thread after this point --> |
duke@435 | 3323 | // + Stop VM thread, it will bring the remaining VM to a safepoint and stop |
duke@435 | 3324 | // the compiler threads at safepoint |
duke@435 | 3325 | // <-- do not use anything that could get blocked by Safepoint --> |
duke@435 | 3326 | // + Disable tracing at JNI/JVM barriers |
duke@435 | 3327 | // + Set _vm_exited flag for threads that are still running native code |
duke@435 | 3328 | // + Delete this thread |
duke@435 | 3329 | // + Call exit_globals() |
duke@435 | 3330 | // > deletes tty |
duke@435 | 3331 | // > deletes PerfMemory resources |
duke@435 | 3332 | // + Return to caller |
duke@435 | 3333 | |
duke@435 | 3334 | bool Threads::destroy_vm() { |
duke@435 | 3335 | JavaThread* thread = JavaThread::current(); |
duke@435 | 3336 | |
duke@435 | 3337 | // Wait until we are the last non-daemon thread to execute |
duke@435 | 3338 | { MutexLocker nu(Threads_lock); |
duke@435 | 3339 | while (Threads::number_of_non_daemon_threads() > 1 ) |
duke@435 | 3340 | // This wait should make safepoint checks, wait without a timeout, |
duke@435 | 3341 | // and wait as a suspend-equivalent condition. |
duke@435 | 3342 | // |
duke@435 | 3343 | // Note: If the FlatProfiler is running and this thread is waiting |
duke@435 | 3344 | // for another non-daemon thread to finish, then the FlatProfiler |
duke@435 | 3345 | // is waiting for the external suspend request on this thread to |
duke@435 | 3346 | // complete. wait_for_ext_suspend_completion() will eventually |
duke@435 | 3347 | // timeout, but that takes time. Making this wait a suspend- |
duke@435 | 3348 | // equivalent condition solves that timeout problem. |
duke@435 | 3349 | // |
duke@435 | 3350 | Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, |
duke@435 | 3351 | Mutex::_as_suspend_equivalent_flag); |
duke@435 | 3352 | } |
duke@435 | 3353 | |
duke@435 | 3354 | // Hang forever on exit if we are reporting an error. |
duke@435 | 3355 | if (ShowMessageBoxOnError && is_error_reported()) { |
duke@435 | 3356 | os::infinite_sleep(); |
duke@435 | 3357 | } |
duke@435 | 3358 | |
duke@435 | 3359 | if (JDK_Version::is_jdk12x_version()) { |
duke@435 | 3360 | // We are the last thread running, so check if finalizers should be run. |
duke@435 | 3361 | // For 1.3 or later this is done in thread->invoke_shutdown_hooks() |
duke@435 | 3362 | HandleMark rm(thread); |
duke@435 | 3363 | Universe::run_finalizers_on_exit(); |
duke@435 | 3364 | } else { |
duke@435 | 3365 | // run Java level shutdown hooks |
duke@435 | 3366 | thread->invoke_shutdown_hooks(); |
duke@435 | 3367 | } |
duke@435 | 3368 | |
duke@435 | 3369 | before_exit(thread); |
duke@435 | 3370 | |
duke@435 | 3371 | thread->exit(true); |
duke@435 | 3372 | |
duke@435 | 3373 | // Stop VM thread. |
duke@435 | 3374 | { |
duke@435 | 3375 | // 4945125 The vm thread comes to a safepoint during exit. |
duke@435 | 3376 | // GC vm_operations can get caught at the safepoint, and the |
duke@435 | 3377 | // heap is unparseable if they are caught. Grab the Heap_lock |
duke@435 | 3378 | // to prevent this. The GC vm_operations will not be able to |
duke@435 | 3379 | // queue until after the vm thread is dead. |
duke@435 | 3380 | MutexLocker ml(Heap_lock); |
duke@435 | 3381 | |
duke@435 | 3382 | VMThread::wait_for_vm_thread_exit(); |
duke@435 | 3383 | assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); |
duke@435 | 3384 | VMThread::destroy(); |
duke@435 | 3385 | } |
duke@435 | 3386 | |
duke@435 | 3387 | // clean up ideal graph printers |
duke@435 | 3388 | #if defined(COMPILER2) && !defined(PRODUCT) |
duke@435 | 3389 | IdealGraphPrinter::clean_up(); |
duke@435 | 3390 | #endif |
duke@435 | 3391 | |
duke@435 | 3392 | // Now, all Java threads are gone except daemon threads. Daemon threads |
duke@435 | 3393 | // running Java code or in VM are stopped by the Safepoint. However, |
duke@435 | 3394 | // daemon threads executing native code are still running. But they |
duke@435 | 3395 | // will be stopped at native=>Java/VM barriers. Note that we can't |
duke@435 | 3396 | // simply kill or suspend them, as it is inherently deadlock-prone. |
duke@435 | 3397 | |
duke@435 | 3398 | #ifndef PRODUCT |
duke@435 | 3399 | // disable function tracing at JNI/JVM barriers |
duke@435 | 3400 | TraceHPI = false; |
duke@435 | 3401 | TraceJNICalls = false; |
duke@435 | 3402 | TraceJVMCalls = false; |
duke@435 | 3403 | TraceRuntimeCalls = false; |
duke@435 | 3404 | #endif |
duke@435 | 3405 | |
duke@435 | 3406 | VM_Exit::set_vm_exited(); |
duke@435 | 3407 | |
duke@435 | 3408 | notify_vm_shutdown(); |
duke@435 | 3409 | |
duke@435 | 3410 | delete thread; |
duke@435 | 3411 | |
duke@435 | 3412 | // exit_globals() will delete tty |
duke@435 | 3413 | exit_globals(); |
duke@435 | 3414 | |
duke@435 | 3415 | return true; |
duke@435 | 3416 | } |
duke@435 | 3417 | |
duke@435 | 3418 | |
duke@435 | 3419 | jboolean Threads::is_supported_jni_version_including_1_1(jint version) { |
duke@435 | 3420 | if (version == JNI_VERSION_1_1) return JNI_TRUE; |
duke@435 | 3421 | return is_supported_jni_version(version); |
duke@435 | 3422 | } |
duke@435 | 3423 | |
duke@435 | 3424 | |
duke@435 | 3425 | jboolean Threads::is_supported_jni_version(jint version) { |
duke@435 | 3426 | if (version == JNI_VERSION_1_2) return JNI_TRUE; |
duke@435 | 3427 | if (version == JNI_VERSION_1_4) return JNI_TRUE; |
duke@435 | 3428 | if (version == JNI_VERSION_1_6) return JNI_TRUE; |
duke@435 | 3429 | return JNI_FALSE; |
duke@435 | 3430 | } |
duke@435 | 3431 | |
duke@435 | 3432 | |
duke@435 | 3433 | void Threads::add(JavaThread* p, bool force_daemon) { |
duke@435 | 3434 | // The threads lock must be owned at this point |
duke@435 | 3435 | assert_locked_or_safepoint(Threads_lock); |
duke@435 | 3436 | p->set_next(_thread_list); |
duke@435 | 3437 | _thread_list = p; |
duke@435 | 3438 | _number_of_threads++; |
duke@435 | 3439 | oop threadObj = p->threadObj(); |
duke@435 | 3440 | bool daemon = true; |
duke@435 | 3441 | // Bootstrapping problem: threadObj can be null for initial |
duke@435 | 3442 | // JavaThread (or for threads attached via JNI) |
duke@435 | 3443 | if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { |
duke@435 | 3444 | _number_of_non_daemon_threads++; |
duke@435 | 3445 | daemon = false; |
duke@435 | 3446 | } |
duke@435 | 3447 | |
duke@435 | 3448 | ThreadService::add_thread(p, daemon); |
duke@435 | 3449 | |
duke@435 | 3450 | // Possible GC point. |
duke@435 | 3451 | Events::log("Thread added: " INTPTR_FORMAT, p); |
duke@435 | 3452 | } |
duke@435 | 3453 | |
duke@435 | 3454 | void Threads::remove(JavaThread* p) { |
duke@435 | 3455 | // Extra scope needed for Thread_lock, so we can check |
duke@435 | 3456 | // that we do not remove thread without safepoint code notice |
duke@435 | 3457 | { MutexLocker ml(Threads_lock); |
duke@435 | 3458 | |
duke@435 | 3459 | assert(includes(p), "p must be present"); |
duke@435 | 3460 | |
duke@435 | 3461 | JavaThread* current = _thread_list; |
duke@435 | 3462 | JavaThread* prev = NULL; |
duke@435 | 3463 | |
duke@435 | 3464 | while (current != p) { |
duke@435 | 3465 | prev = current; |
duke@435 | 3466 | current = current->next(); |
duke@435 | 3467 | } |
duke@435 | 3468 | |
duke@435 | 3469 | if (prev) { |
duke@435 | 3470 | prev->set_next(current->next()); |
duke@435 | 3471 | } else { |
duke@435 | 3472 | _thread_list = p->next(); |
duke@435 | 3473 | } |
duke@435 | 3474 | _number_of_threads--; |
duke@435 | 3475 | oop threadObj = p->threadObj(); |
duke@435 | 3476 | bool daemon = true; |
duke@435 | 3477 | if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { |
duke@435 | 3478 | _number_of_non_daemon_threads--; |
duke@435 | 3479 | daemon = false; |
duke@435 | 3480 | |
duke@435 | 3481 | // Only one thread left, do a notify on the Threads_lock so a thread waiting |
duke@435 | 3482 | // on destroy_vm will wake up. |
duke@435 | 3483 | if (number_of_non_daemon_threads() == 1) |
duke@435 | 3484 | Threads_lock->notify_all(); |
duke@435 | 3485 | } |
duke@435 | 3486 | ThreadService::remove_thread(p, daemon); |
duke@435 | 3487 | |
duke@435 | 3488 | // Make sure that safepoint code disregard this thread. This is needed since |
duke@435 | 3489 | // the thread might mess around with locks after this point. This can cause it |
duke@435 | 3490 | // to do callbacks into the safepoint code. However, the safepoint code is not aware |
duke@435 | 3491 | // of this thread since it is removed from the queue. |
duke@435 | 3492 | p->set_terminated_value(); |
duke@435 | 3493 | } // unlock Threads_lock |
duke@435 | 3494 | |
duke@435 | 3495 | // Since Events::log uses a lock, we grab it outside the Threads_lock |
duke@435 | 3496 | Events::log("Thread exited: " INTPTR_FORMAT, p); |
duke@435 | 3497 | } |
duke@435 | 3498 | |
duke@435 | 3499 | // Threads_lock must be held when this is called (or must be called during a safepoint) |
duke@435 | 3500 | bool Threads::includes(JavaThread* p) { |
duke@435 | 3501 | assert(Threads_lock->is_locked(), "sanity check"); |
duke@435 | 3502 | ALL_JAVA_THREADS(q) { |
duke@435 | 3503 | if (q == p ) { |
duke@435 | 3504 | return true; |
duke@435 | 3505 | } |
duke@435 | 3506 | } |
duke@435 | 3507 | return false; |
duke@435 | 3508 | } |
duke@435 | 3509 | |
duke@435 | 3510 | // Operations on the Threads list for GC. These are not explicitly locked, |
duke@435 | 3511 | // but the garbage collector must provide a safe context for them to run. |
duke@435 | 3512 | // In particular, these things should never be called when the Threads_lock |
duke@435 | 3513 | // is held by some other thread. (Note: the Safepoint abstraction also |
duke@435 | 3514 | // uses the Threads_lock to gurantee this property. It also makes sure that |
duke@435 | 3515 | // all threads gets blocked when exiting or starting). |
duke@435 | 3516 | |
duke@435 | 3517 | void Threads::oops_do(OopClosure* f) { |
duke@435 | 3518 | ALL_JAVA_THREADS(p) { |
duke@435 | 3519 | p->oops_do(f); |
duke@435 | 3520 | } |
duke@435 | 3521 | VMThread::vm_thread()->oops_do(f); |
duke@435 | 3522 | } |
duke@435 | 3523 | |
duke@435 | 3524 | void Threads::possibly_parallel_oops_do(OopClosure* f) { |
duke@435 | 3525 | // Introduce a mechanism allowing parallel threads to claim threads as |
duke@435 | 3526 | // root groups. Overhead should be small enough to use all the time, |
duke@435 | 3527 | // even in sequential code. |
duke@435 | 3528 | SharedHeap* sh = SharedHeap::heap(); |
duke@435 | 3529 | bool is_par = (sh->n_par_threads() > 0); |
duke@435 | 3530 | int cp = SharedHeap::heap()->strong_roots_parity(); |
duke@435 | 3531 | ALL_JAVA_THREADS(p) { |
duke@435 | 3532 | if (p->claim_oops_do(is_par, cp)) { |
duke@435 | 3533 | p->oops_do(f); |
duke@435 | 3534 | } |
duke@435 | 3535 | } |
duke@435 | 3536 | VMThread* vmt = VMThread::vm_thread(); |
duke@435 | 3537 | if (vmt->claim_oops_do(is_par, cp)) |
duke@435 | 3538 | vmt->oops_do(f); |
duke@435 | 3539 | } |
duke@435 | 3540 | |
duke@435 | 3541 | #ifndef SERIALGC |
duke@435 | 3542 | // Used by ParallelScavenge |
duke@435 | 3543 | void Threads::create_thread_roots_tasks(GCTaskQueue* q) { |
duke@435 | 3544 | ALL_JAVA_THREADS(p) { |
duke@435 | 3545 | q->enqueue(new ThreadRootsTask(p)); |
duke@435 | 3546 | } |
duke@435 | 3547 | q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); |
duke@435 | 3548 | } |
duke@435 | 3549 | |
duke@435 | 3550 | // Used by Parallel Old |
duke@435 | 3551 | void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { |
duke@435 | 3552 | ALL_JAVA_THREADS(p) { |
duke@435 | 3553 | q->enqueue(new ThreadRootsMarkingTask(p)); |
duke@435 | 3554 | } |
duke@435 | 3555 | q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); |
duke@435 | 3556 | } |
duke@435 | 3557 | #endif // SERIALGC |
duke@435 | 3558 | |
duke@435 | 3559 | void Threads::nmethods_do() { |
duke@435 | 3560 | ALL_JAVA_THREADS(p) { |
duke@435 | 3561 | p->nmethods_do(); |
duke@435 | 3562 | } |
duke@435 | 3563 | VMThread::vm_thread()->nmethods_do(); |
duke@435 | 3564 | } |
duke@435 | 3565 | |
duke@435 | 3566 | void Threads::gc_epilogue() { |
duke@435 | 3567 | ALL_JAVA_THREADS(p) { |
duke@435 | 3568 | p->gc_epilogue(); |
duke@435 | 3569 | } |
duke@435 | 3570 | } |
duke@435 | 3571 | |
duke@435 | 3572 | void Threads::gc_prologue() { |
duke@435 | 3573 | ALL_JAVA_THREADS(p) { |
duke@435 | 3574 | p->gc_prologue(); |
duke@435 | 3575 | } |
duke@435 | 3576 | } |
duke@435 | 3577 | |
duke@435 | 3578 | void Threads::deoptimized_wrt_marked_nmethods() { |
duke@435 | 3579 | ALL_JAVA_THREADS(p) { |
duke@435 | 3580 | p->deoptimized_wrt_marked_nmethods(); |
duke@435 | 3581 | } |
duke@435 | 3582 | } |
duke@435 | 3583 | |
duke@435 | 3584 | |
duke@435 | 3585 | // Get count Java threads that are waiting to enter the specified monitor. |
duke@435 | 3586 | GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, |
duke@435 | 3587 | address monitor, bool doLock) { |
duke@435 | 3588 | assert(doLock || SafepointSynchronize::is_at_safepoint(), |
duke@435 | 3589 | "must grab Threads_lock or be at safepoint"); |
duke@435 | 3590 | GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); |
duke@435 | 3591 | |
duke@435 | 3592 | int i = 0; |
duke@435 | 3593 | { |
duke@435 | 3594 | MutexLockerEx ml(doLock ? Threads_lock : NULL); |
duke@435 | 3595 | ALL_JAVA_THREADS(p) { |
duke@435 | 3596 | if (p->is_Compiler_thread()) continue; |
duke@435 | 3597 | |
duke@435 | 3598 | address pending = (address)p->current_pending_monitor(); |
duke@435 | 3599 | if (pending == monitor) { // found a match |
duke@435 | 3600 | if (i < count) result->append(p); // save the first count matches |
duke@435 | 3601 | i++; |
duke@435 | 3602 | } |
duke@435 | 3603 | } |
duke@435 | 3604 | } |
duke@435 | 3605 | return result; |
duke@435 | 3606 | } |
duke@435 | 3607 | |
duke@435 | 3608 | |
duke@435 | 3609 | JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { |
duke@435 | 3610 | assert(doLock || |
duke@435 | 3611 | Threads_lock->owned_by_self() || |
duke@435 | 3612 | SafepointSynchronize::is_at_safepoint(), |
duke@435 | 3613 | "must grab Threads_lock or be at safepoint"); |
duke@435 | 3614 | |
duke@435 | 3615 | // NULL owner means not locked so we can skip the search |
duke@435 | 3616 | if (owner == NULL) return NULL; |
duke@435 | 3617 | |
duke@435 | 3618 | { |
duke@435 | 3619 | MutexLockerEx ml(doLock ? Threads_lock : NULL); |
duke@435 | 3620 | ALL_JAVA_THREADS(p) { |
duke@435 | 3621 | // first, see if owner is the address of a Java thread |
duke@435 | 3622 | if (owner == (address)p) return p; |
duke@435 | 3623 | } |
duke@435 | 3624 | } |
duke@435 | 3625 | assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); |
duke@435 | 3626 | if (UseHeavyMonitors) return NULL; |
duke@435 | 3627 | |
duke@435 | 3628 | // |
duke@435 | 3629 | // If we didn't find a matching Java thread and we didn't force use of |
duke@435 | 3630 | // heavyweight monitors, then the owner is the stack address of the |
duke@435 | 3631 | // Lock Word in the owning Java thread's stack. |
duke@435 | 3632 | // |
duke@435 | 3633 | // We can't use Thread::is_lock_owned() or Thread::lock_is_in_stack() because |
duke@435 | 3634 | // those routines rely on the "current" stack pointer. That would be our |
duke@435 | 3635 | // stack pointer which is not relevant to the question. Instead we use the |
duke@435 | 3636 | // highest lock ever entered by the thread and find the thread that is |
duke@435 | 3637 | // higher than and closest to our target stack address. |
duke@435 | 3638 | // |
duke@435 | 3639 | address least_diff = 0; |
duke@435 | 3640 | bool least_diff_initialized = false; |
duke@435 | 3641 | JavaThread* the_owner = NULL; |
duke@435 | 3642 | { |
duke@435 | 3643 | MutexLockerEx ml(doLock ? Threads_lock : NULL); |
duke@435 | 3644 | ALL_JAVA_THREADS(q) { |
duke@435 | 3645 | address addr = q->highest_lock(); |
duke@435 | 3646 | if (addr == NULL || addr < owner) continue; // thread has entered no monitors or is too low |
duke@435 | 3647 | address diff = (address)(addr - owner); |
duke@435 | 3648 | if (!least_diff_initialized || diff < least_diff) { |
duke@435 | 3649 | least_diff_initialized = true; |
duke@435 | 3650 | least_diff = diff; |
duke@435 | 3651 | the_owner = q; |
duke@435 | 3652 | } |
duke@435 | 3653 | } |
duke@435 | 3654 | } |
duke@435 | 3655 | assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); |
duke@435 | 3656 | return the_owner; |
duke@435 | 3657 | } |
duke@435 | 3658 | |
duke@435 | 3659 | // Threads::print_on() is called at safepoint by VM_PrintThreads operation. |
duke@435 | 3660 | void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { |
duke@435 | 3661 | char buf[32]; |
duke@435 | 3662 | st->print_cr(os::local_time_string(buf, sizeof(buf))); |
duke@435 | 3663 | |
duke@435 | 3664 | st->print_cr("Full thread dump %s (%s %s):", |
duke@435 | 3665 | Abstract_VM_Version::vm_name(), |
duke@435 | 3666 | Abstract_VM_Version::vm_release(), |
duke@435 | 3667 | Abstract_VM_Version::vm_info_string() |
duke@435 | 3668 | ); |
duke@435 | 3669 | st->cr(); |
duke@435 | 3670 | |
duke@435 | 3671 | #ifndef SERIALGC |
duke@435 | 3672 | // Dump concurrent locks |
duke@435 | 3673 | ConcurrentLocksDump concurrent_locks; |
duke@435 | 3674 | if (print_concurrent_locks) { |
duke@435 | 3675 | concurrent_locks.dump_at_safepoint(); |
duke@435 | 3676 | } |
duke@435 | 3677 | #endif // SERIALGC |
duke@435 | 3678 | |
duke@435 | 3679 | ALL_JAVA_THREADS(p) { |
duke@435 | 3680 | ResourceMark rm; |
duke@435 | 3681 | p->print_on(st); |
duke@435 | 3682 | if (print_stacks) { |
duke@435 | 3683 | if (internal_format) { |
duke@435 | 3684 | p->trace_stack(); |
duke@435 | 3685 | } else { |
duke@435 | 3686 | p->print_stack_on(st); |
duke@435 | 3687 | } |
duke@435 | 3688 | } |
duke@435 | 3689 | st->cr(); |
duke@435 | 3690 | #ifndef SERIALGC |
duke@435 | 3691 | if (print_concurrent_locks) { |
duke@435 | 3692 | concurrent_locks.print_locks_on(p, st); |
duke@435 | 3693 | } |
duke@435 | 3694 | #endif // SERIALGC |
duke@435 | 3695 | } |
duke@435 | 3696 | |
duke@435 | 3697 | VMThread::vm_thread()->print_on(st); |
duke@435 | 3698 | st->cr(); |
duke@435 | 3699 | Universe::heap()->print_gc_threads_on(st); |
duke@435 | 3700 | WatcherThread* wt = WatcherThread::watcher_thread(); |
duke@435 | 3701 | if (wt != NULL) wt->print_on(st); |
duke@435 | 3702 | st->cr(); |
duke@435 | 3703 | CompileBroker::print_compiler_threads_on(st); |
duke@435 | 3704 | st->flush(); |
duke@435 | 3705 | } |
duke@435 | 3706 | |
duke@435 | 3707 | // Threads::print_on_error() is called by fatal error handler. It's possible |
duke@435 | 3708 | // that VM is not at safepoint and/or current thread is inside signal handler. |
duke@435 | 3709 | // Don't print stack trace, as the stack may not be walkable. Don't allocate |
duke@435 | 3710 | // memory (even in resource area), it might deadlock the error handler. |
duke@435 | 3711 | void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { |
duke@435 | 3712 | bool found_current = false; |
duke@435 | 3713 | st->print_cr("Java Threads: ( => current thread )"); |
duke@435 | 3714 | ALL_JAVA_THREADS(thread) { |
duke@435 | 3715 | bool is_current = (current == thread); |
duke@435 | 3716 | found_current = found_current || is_current; |
duke@435 | 3717 | |
duke@435 | 3718 | st->print("%s", is_current ? "=>" : " "); |
duke@435 | 3719 | |
duke@435 | 3720 | st->print(PTR_FORMAT, thread); |
duke@435 | 3721 | st->print(" "); |
duke@435 | 3722 | thread->print_on_error(st, buf, buflen); |
duke@435 | 3723 | st->cr(); |
duke@435 | 3724 | } |
duke@435 | 3725 | st->cr(); |
duke@435 | 3726 | |
duke@435 | 3727 | st->print_cr("Other Threads:"); |
duke@435 | 3728 | if (VMThread::vm_thread()) { |
duke@435 | 3729 | bool is_current = (current == VMThread::vm_thread()); |
duke@435 | 3730 | found_current = found_current || is_current; |
duke@435 | 3731 | st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); |
duke@435 | 3732 | |
duke@435 | 3733 | st->print(PTR_FORMAT, VMThread::vm_thread()); |
duke@435 | 3734 | st->print(" "); |
duke@435 | 3735 | VMThread::vm_thread()->print_on_error(st, buf, buflen); |
duke@435 | 3736 | st->cr(); |
duke@435 | 3737 | } |
duke@435 | 3738 | WatcherThread* wt = WatcherThread::watcher_thread(); |
duke@435 | 3739 | if (wt != NULL) { |
duke@435 | 3740 | bool is_current = (current == wt); |
duke@435 | 3741 | found_current = found_current || is_current; |
duke@435 | 3742 | st->print("%s", is_current ? "=>" : " "); |
duke@435 | 3743 | |
duke@435 | 3744 | st->print(PTR_FORMAT, wt); |
duke@435 | 3745 | st->print(" "); |
duke@435 | 3746 | wt->print_on_error(st, buf, buflen); |
duke@435 | 3747 | st->cr(); |
duke@435 | 3748 | } |
duke@435 | 3749 | if (!found_current) { |
duke@435 | 3750 | st->cr(); |
duke@435 | 3751 | st->print("=>" PTR_FORMAT " (exited) ", current); |
duke@435 | 3752 | current->print_on_error(st, buf, buflen); |
duke@435 | 3753 | st->cr(); |
duke@435 | 3754 | } |
duke@435 | 3755 | } |
duke@435 | 3756 | |
duke@435 | 3757 | |
duke@435 | 3758 | // Lifecycle management for TSM ParkEvents. |
duke@435 | 3759 | // ParkEvents are type-stable (TSM). |
duke@435 | 3760 | // In our particular implementation they happen to be immortal. |
duke@435 | 3761 | // |
duke@435 | 3762 | // We manage concurrency on the FreeList with a CAS-based |
duke@435 | 3763 | // detach-modify-reattach idiom that avoids the ABA problems |
duke@435 | 3764 | // that would otherwise be present in a simple CAS-based |
duke@435 | 3765 | // push-pop implementation. (push-one and pop-all) |
duke@435 | 3766 | // |
duke@435 | 3767 | // Caveat: Allocate() and Release() may be called from threads |
duke@435 | 3768 | // other than the thread associated with the Event! |
duke@435 | 3769 | // If we need to call Allocate() when running as the thread in |
duke@435 | 3770 | // question then look for the PD calls to initialize native TLS. |
duke@435 | 3771 | // Native TLS (Win32/Linux/Solaris) can only be initialized or |
duke@435 | 3772 | // accessed by the associated thread. |
duke@435 | 3773 | // See also pd_initialize(). |
duke@435 | 3774 | // |
duke@435 | 3775 | // Note that we could defer associating a ParkEvent with a thread |
duke@435 | 3776 | // until the 1st time the thread calls park(). unpark() calls to |
duke@435 | 3777 | // an unprovisioned thread would be ignored. The first park() call |
duke@435 | 3778 | // for a thread would allocate and associate a ParkEvent and return |
duke@435 | 3779 | // immediately. |
duke@435 | 3780 | |
duke@435 | 3781 | volatile int ParkEvent::ListLock = 0 ; |
duke@435 | 3782 | ParkEvent * volatile ParkEvent::FreeList = NULL ; |
duke@435 | 3783 | |
duke@435 | 3784 | ParkEvent * ParkEvent::Allocate (Thread * t) { |
duke@435 | 3785 | // In rare cases -- JVM_RawMonitor* operations -- we can find t == null. |
duke@435 | 3786 | ParkEvent * ev ; |
duke@435 | 3787 | |
duke@435 | 3788 | // Start by trying to recycle an existing but unassociated |
duke@435 | 3789 | // ParkEvent from the global free list. |
duke@435 | 3790 | for (;;) { |
duke@435 | 3791 | ev = FreeList ; |
duke@435 | 3792 | if (ev == NULL) break ; |
duke@435 | 3793 | // 1: Detach - sequester or privatize the list |
duke@435 | 3794 | // Tantamount to ev = Swap (&FreeList, NULL) |
duke@435 | 3795 | if (Atomic::cmpxchg_ptr (NULL, &FreeList, ev) != ev) { |
duke@435 | 3796 | continue ; |
duke@435 | 3797 | } |
duke@435 | 3798 | |
duke@435 | 3799 | // We've detached the list. The list in-hand is now |
duke@435 | 3800 | // local to this thread. This thread can operate on the |
duke@435 | 3801 | // list without risk of interference from other threads. |
duke@435 | 3802 | // 2: Extract -- pop the 1st element from the list. |
duke@435 | 3803 | ParkEvent * List = ev->FreeNext ; |
duke@435 | 3804 | if (List == NULL) break ; |
duke@435 | 3805 | for (;;) { |
duke@435 | 3806 | // 3: Try to reattach the residual list |
duke@435 | 3807 | guarantee (List != NULL, "invariant") ; |
duke@435 | 3808 | ParkEvent * Arv = (ParkEvent *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; |
duke@435 | 3809 | if (Arv == NULL) break ; |
duke@435 | 3810 | |
duke@435 | 3811 | // New nodes arrived. Try to detach the recent arrivals. |
duke@435 | 3812 | if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { |
duke@435 | 3813 | continue ; |
duke@435 | 3814 | } |
duke@435 | 3815 | guarantee (Arv != NULL, "invariant") ; |
duke@435 | 3816 | // 4: Merge Arv into List |
duke@435 | 3817 | ParkEvent * Tail = List ; |
duke@435 | 3818 | while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; |
duke@435 | 3819 | Tail->FreeNext = Arv ; |
duke@435 | 3820 | } |
duke@435 | 3821 | break ; |
duke@435 | 3822 | } |
duke@435 | 3823 | |
duke@435 | 3824 | if (ev != NULL) { |
duke@435 | 3825 | guarantee (ev->AssociatedWith == NULL, "invariant") ; |
duke@435 | 3826 | } else { |
duke@435 | 3827 | // Do this the hard way -- materialize a new ParkEvent. |
duke@435 | 3828 | // In rare cases an allocating thread might detach a long list -- |
duke@435 | 3829 | // installing null into FreeList -- and then stall or be obstructed. |
duke@435 | 3830 | // A 2nd thread calling Allocate() would see FreeList == null. |
duke@435 | 3831 | // The list held privately by the 1st thread is unavailable to the 2nd thread. |
duke@435 | 3832 | // In that case the 2nd thread would have to materialize a new ParkEvent, |
duke@435 | 3833 | // even though free ParkEvents existed in the system. In this case we end up |
duke@435 | 3834 | // with more ParkEvents in circulation than we need, but the race is |
duke@435 | 3835 | // rare and the outcome is benign. Ideally, the # of extant ParkEvents |
duke@435 | 3836 | // is equal to the maximum # of threads that existed at any one time. |
duke@435 | 3837 | // Because of the race mentioned above, segments of the freelist |
duke@435 | 3838 | // can be transiently inaccessible. At worst we may end up with the |
duke@435 | 3839 | // # of ParkEvents in circulation slightly above the ideal. |
duke@435 | 3840 | // Note that if we didn't have the TSM/immortal constraint, then |
duke@435 | 3841 | // when reattaching, above, we could trim the list. |
duke@435 | 3842 | ev = new ParkEvent () ; |
duke@435 | 3843 | guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ; |
duke@435 | 3844 | } |
duke@435 | 3845 | ev->reset() ; // courtesy to caller |
duke@435 | 3846 | ev->AssociatedWith = t ; // Associate ev with t |
duke@435 | 3847 | ev->FreeNext = NULL ; |
duke@435 | 3848 | return ev ; |
duke@435 | 3849 | } |
duke@435 | 3850 | |
duke@435 | 3851 | void ParkEvent::Release (ParkEvent * ev) { |
duke@435 | 3852 | if (ev == NULL) return ; |
duke@435 | 3853 | guarantee (ev->FreeNext == NULL , "invariant") ; |
duke@435 | 3854 | ev->AssociatedWith = NULL ; |
duke@435 | 3855 | for (;;) { |
duke@435 | 3856 | // Push ev onto FreeList |
duke@435 | 3857 | // The mechanism is "half" lock-free. |
duke@435 | 3858 | ParkEvent * List = FreeList ; |
duke@435 | 3859 | ev->FreeNext = List ; |
duke@435 | 3860 | if (Atomic::cmpxchg_ptr (ev, &FreeList, List) == List) break ; |
duke@435 | 3861 | } |
duke@435 | 3862 | } |
duke@435 | 3863 | |
duke@435 | 3864 | // Override operator new and delete so we can ensure that the |
duke@435 | 3865 | // least significant byte of ParkEvent addresses is 0. |
duke@435 | 3866 | // Beware that excessive address alignment is undesirable |
duke@435 | 3867 | // as it can result in D$ index usage imbalance as |
duke@435 | 3868 | // well as bank access imbalance on Niagara-like platforms, |
duke@435 | 3869 | // although Niagara's hash function should help. |
duke@435 | 3870 | |
duke@435 | 3871 | void * ParkEvent::operator new (size_t sz) { |
duke@435 | 3872 | return (void *) ((intptr_t (CHeapObj::operator new (sz + 256)) + 256) & -256) ; |
duke@435 | 3873 | } |
duke@435 | 3874 | |
duke@435 | 3875 | void ParkEvent::operator delete (void * a) { |
duke@435 | 3876 | // ParkEvents are type-stable and immortal ... |
duke@435 | 3877 | ShouldNotReachHere(); |
duke@435 | 3878 | } |
duke@435 | 3879 | |
duke@435 | 3880 | |
duke@435 | 3881 | // 6399321 As a temporary measure we copied & modified the ParkEvent:: |
duke@435 | 3882 | // allocate() and release() code for use by Parkers. The Parker:: forms |
duke@435 | 3883 | // will eventually be removed as we consolide and shift over to ParkEvents |
duke@435 | 3884 | // for both builtin synchronization and JSR166 operations. |
duke@435 | 3885 | |
duke@435 | 3886 | volatile int Parker::ListLock = 0 ; |
duke@435 | 3887 | Parker * volatile Parker::FreeList = NULL ; |
duke@435 | 3888 | |
duke@435 | 3889 | Parker * Parker::Allocate (JavaThread * t) { |
duke@435 | 3890 | guarantee (t != NULL, "invariant") ; |
duke@435 | 3891 | Parker * p ; |
duke@435 | 3892 | |
duke@435 | 3893 | // Start by trying to recycle an existing but unassociated |
duke@435 | 3894 | // Parker from the global free list. |
duke@435 | 3895 | for (;;) { |
duke@435 | 3896 | p = FreeList ; |
duke@435 | 3897 | if (p == NULL) break ; |
duke@435 | 3898 | // 1: Detach |
duke@435 | 3899 | // Tantamount to p = Swap (&FreeList, NULL) |
duke@435 | 3900 | if (Atomic::cmpxchg_ptr (NULL, &FreeList, p) != p) { |
duke@435 | 3901 | continue ; |
duke@435 | 3902 | } |
duke@435 | 3903 | |
duke@435 | 3904 | // We've detached the list. The list in-hand is now |
duke@435 | 3905 | // local to this thread. This thread can operate on the |
duke@435 | 3906 | // list without risk of interference from other threads. |
duke@435 | 3907 | // 2: Extract -- pop the 1st element from the list. |
duke@435 | 3908 | Parker * List = p->FreeNext ; |
duke@435 | 3909 | if (List == NULL) break ; |
duke@435 | 3910 | for (;;) { |
duke@435 | 3911 | // 3: Try to reattach the residual list |
duke@435 | 3912 | guarantee (List != NULL, "invariant") ; |
duke@435 | 3913 | Parker * Arv = (Parker *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; |
duke@435 | 3914 | if (Arv == NULL) break ; |
duke@435 | 3915 | |
duke@435 | 3916 | // New nodes arrived. Try to detach the recent arrivals. |
duke@435 | 3917 | if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { |
duke@435 | 3918 | continue ; |
duke@435 | 3919 | } |
duke@435 | 3920 | guarantee (Arv != NULL, "invariant") ; |
duke@435 | 3921 | // 4: Merge Arv into List |
duke@435 | 3922 | Parker * Tail = List ; |
duke@435 | 3923 | while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; |
duke@435 | 3924 | Tail->FreeNext = Arv ; |
duke@435 | 3925 | } |
duke@435 | 3926 | break ; |
duke@435 | 3927 | } |
duke@435 | 3928 | |
duke@435 | 3929 | if (p != NULL) { |
duke@435 | 3930 | guarantee (p->AssociatedWith == NULL, "invariant") ; |
duke@435 | 3931 | } else { |
duke@435 | 3932 | // Do this the hard way -- materialize a new Parker.. |
duke@435 | 3933 | // In rare cases an allocating thread might detach |
duke@435 | 3934 | // a long list -- installing null into FreeList --and |
duke@435 | 3935 | // then stall. Another thread calling Allocate() would see |
duke@435 | 3936 | // FreeList == null and then invoke the ctor. In this case we |
duke@435 | 3937 | // end up with more Parkers in circulation than we need, but |
duke@435 | 3938 | // the race is rare and the outcome is benign. |
duke@435 | 3939 | // Ideally, the # of extant Parkers is equal to the |
duke@435 | 3940 | // maximum # of threads that existed at any one time. |
duke@435 | 3941 | // Because of the race mentioned above, segments of the |
duke@435 | 3942 | // freelist can be transiently inaccessible. At worst |
duke@435 | 3943 | // we may end up with the # of Parkers in circulation |
duke@435 | 3944 | // slightly above the ideal. |
duke@435 | 3945 | p = new Parker() ; |
duke@435 | 3946 | } |
duke@435 | 3947 | p->AssociatedWith = t ; // Associate p with t |
duke@435 | 3948 | p->FreeNext = NULL ; |
duke@435 | 3949 | return p ; |
duke@435 | 3950 | } |
duke@435 | 3951 | |
duke@435 | 3952 | |
duke@435 | 3953 | void Parker::Release (Parker * p) { |
duke@435 | 3954 | if (p == NULL) return ; |
duke@435 | 3955 | guarantee (p->AssociatedWith != NULL, "invariant") ; |
duke@435 | 3956 | guarantee (p->FreeNext == NULL , "invariant") ; |
duke@435 | 3957 | p->AssociatedWith = NULL ; |
duke@435 | 3958 | for (;;) { |
duke@435 | 3959 | // Push p onto FreeList |
duke@435 | 3960 | Parker * List = FreeList ; |
duke@435 | 3961 | p->FreeNext = List ; |
duke@435 | 3962 | if (Atomic::cmpxchg_ptr (p, &FreeList, List) == List) break ; |
duke@435 | 3963 | } |
duke@435 | 3964 | } |
duke@435 | 3965 | |
duke@435 | 3966 | void Threads::verify() { |
duke@435 | 3967 | ALL_JAVA_THREADS(p) { |
duke@435 | 3968 | p->verify(); |
duke@435 | 3969 | } |
duke@435 | 3970 | VMThread* thread = VMThread::vm_thread(); |
duke@435 | 3971 | if (thread != NULL) thread->verify(); |
duke@435 | 3972 | } |