duke@435: /* zgu@4492: * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. duke@435: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. duke@435: * duke@435: * This code is free software; you can redistribute it and/or modify it duke@435: * under the terms of the GNU General Public License version 2 only, as duke@435: * published by the Free Software Foundation. duke@435: * duke@435: * This code is distributed in the hope that it will be useful, but WITHOUT duke@435: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or duke@435: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License duke@435: * version 2 for more details (a copy is included in the LICENSE file that duke@435: * accompanied this code). duke@435: * duke@435: * You should have received a copy of the GNU General Public License version duke@435: * 2 along with this work; if not, write to the Free Software Foundation, duke@435: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. duke@435: * trims@1907: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA trims@1907: * or visit www.oracle.com if you need additional information or have any trims@1907: * questions. duke@435: * duke@435: */ duke@435: stefank@2314: #include "precompiled.hpp" stefank@2314: #include "classfile/classLoader.hpp" stefank@2314: #include "classfile/javaClasses.hpp" stefank@2314: #include "classfile/systemDictionary.hpp" stefank@2314: #include "classfile/vmSymbols.hpp" stefank@2314: #include "code/scopeDesc.hpp" stefank@2314: #include "compiler/compileBroker.hpp" stefank@2314: #include "interpreter/interpreter.hpp" stefank@2314: #include "interpreter/linkResolver.hpp" never@2868: #include "interpreter/oopMapCache.hpp" kamg@2446: #include "jvmtifiles/jvmtiEnv.hpp" never@3500: #include "memory/gcLocker.inline.hpp" coleenp@4037: #include "memory/metaspaceShared.hpp" stefank@2314: #include "memory/oopFactory.hpp" stefank@2314: #include "memory/universe.inline.hpp" stefank@2314: #include "oops/instanceKlass.hpp" stefank@2314: #include "oops/objArrayOop.hpp" stefank@2314: #include "oops/oop.inline.hpp" coleenp@2497: #include "oops/symbol.hpp" stefank@2314: #include "prims/jvm_misc.hpp" stefank@2314: #include "prims/jvmtiExport.hpp" stefank@2314: #include "prims/jvmtiThreadState.hpp" stefank@2314: #include "prims/privilegedStack.hpp" stefank@2314: #include "runtime/arguments.hpp" stefank@2314: #include "runtime/biasedLocking.hpp" stefank@2314: #include "runtime/deoptimization.hpp" stefank@2314: #include "runtime/fprofiler.hpp" stefank@2314: #include "runtime/frame.inline.hpp" stefank@2314: #include "runtime/init.hpp" stefank@2314: #include "runtime/interfaceSupport.hpp" stefank@2314: #include "runtime/java.hpp" stefank@2314: #include "runtime/javaCalls.hpp" stefank@2314: #include "runtime/jniPeriodicChecker.hpp" stefank@2314: #include "runtime/memprofiler.hpp" stefank@2314: #include "runtime/mutexLocker.hpp" stefank@2314: #include "runtime/objectMonitor.hpp" stefank@2314: #include "runtime/osThread.hpp" stefank@2314: #include "runtime/safepoint.hpp" stefank@2314: #include "runtime/sharedRuntime.hpp" stefank@2314: #include "runtime/statSampler.hpp" stefank@2314: #include "runtime/stubRoutines.hpp" stefank@2314: #include "runtime/task.hpp" stefank@4299: #include "runtime/thread.inline.hpp" stefank@2314: #include "runtime/threadCritical.hpp" stefank@2314: #include "runtime/threadLocalStorage.hpp" stefank@2314: #include "runtime/vframe.hpp" stefank@2314: #include "runtime/vframeArray.hpp" stefank@2314: #include "runtime/vframe_hp.hpp" stefank@2314: #include "runtime/vmThread.hpp" stefank@2314: #include "runtime/vm_operations.hpp" stefank@2314: #include "services/attachListener.hpp" stefank@2314: #include "services/management.hpp" zgu@3900: #include "services/memTracker.hpp" stefank@2314: #include "services/threadService.hpp" sla@5237: #include "trace/tracing.hpp" sla@5237: #include "trace/traceMacros.hpp" stefank@2314: #include "utilities/defaultStream.hpp" stefank@2314: #include "utilities/dtrace.hpp" stefank@2314: #include "utilities/events.hpp" stefank@2314: #include "utilities/preserveException.hpp" jprovino@4542: #include "utilities/macros.hpp" stefank@2314: #ifdef TARGET_OS_FAMILY_linux stefank@2314: # include "os_linux.inline.hpp" stefank@2314: #endif stefank@2314: #ifdef TARGET_OS_FAMILY_solaris stefank@2314: # include "os_solaris.inline.hpp" stefank@2314: #endif stefank@2314: #ifdef TARGET_OS_FAMILY_windows stefank@2314: # include "os_windows.inline.hpp" stefank@2314: #endif never@3156: #ifdef TARGET_OS_FAMILY_bsd never@3156: # include "os_bsd.inline.hpp" never@3156: #endif jprovino@4542: #if INCLUDE_ALL_GCS stefank@2314: #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" stefank@2314: #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" stefank@2314: #include "gc_implementation/parallelScavenge/pcTasks.hpp" jprovino@4542: #endif // INCLUDE_ALL_GCS stefank@2314: #ifdef COMPILER1 stefank@2314: #include "c1/c1_Compiler.hpp" stefank@2314: #endif stefank@2314: #ifdef COMPILER2 stefank@2314: #include "opto/c2compiler.hpp" stefank@2314: #include "opto/idealGraphPrinter.hpp" stefank@2314: #endif duke@435: duke@435: #ifdef DTRACE_ENABLED duke@435: duke@435: // Only bother with this argument setup if dtrace is available duke@435: dcubed@3202: #ifndef USDT2 duke@435: HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); duke@435: HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); duke@435: HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, duke@435: intptr_t, intptr_t, bool); duke@435: HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, duke@435: intptr_t, intptr_t, bool); duke@435: duke@435: #define DTRACE_THREAD_PROBE(probe, javathread) \ duke@435: { \ duke@435: ResourceMark rm(this); \ duke@435: int len = 0; \ duke@435: const char* name = (javathread)->get_thread_name(); \ duke@435: len = strlen(name); \ duke@435: HS_DTRACE_PROBE5(hotspot, thread__##probe, \ duke@435: name, len, \ duke@435: java_lang_Thread::thread_id((javathread)->threadObj()), \ duke@435: (javathread)->osthread()->thread_id(), \ duke@435: java_lang_Thread::is_daemon((javathread)->threadObj())); \ duke@435: } duke@435: dcubed@3202: #else /* USDT2 */ dcubed@3202: dcubed@3202: #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START dcubed@3202: #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP dcubed@3202: dcubed@3202: #define DTRACE_THREAD_PROBE(probe, javathread) \ dcubed@3202: { \ dcubed@3202: ResourceMark rm(this); \ dcubed@3202: int len = 0; \ dcubed@3202: const char* name = (javathread)->get_thread_name(); \ dcubed@3202: len = strlen(name); \ dcubed@3202: HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ dcubed@3202: (char *) name, len, \ dcubed@3202: java_lang_Thread::thread_id((javathread)->threadObj()), \ dcubed@3202: (uintptr_t) (javathread)->osthread()->thread_id(), \ dcubed@3202: java_lang_Thread::is_daemon((javathread)->threadObj())); \ dcubed@3202: } dcubed@3202: dcubed@3202: #endif /* USDT2 */ dcubed@3202: duke@435: #else // ndef DTRACE_ENABLED duke@435: duke@435: #define DTRACE_THREAD_PROBE(probe, javathread) duke@435: duke@435: #endif // ndef DTRACE_ENABLED duke@435: zgu@3900: duke@435: // Class hierarchy duke@435: // - Thread duke@435: // - VMThread duke@435: // - WatcherThread duke@435: // - ConcurrentMarkSweepThread duke@435: // - JavaThread duke@435: // - CompilerThread duke@435: duke@435: // ======= Thread ======== duke@435: // Support for forcing alignment of thread objects for biased locking zgu@3900: void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { duke@435: if (UseBiasedLocking) { duke@435: const int alignment = markOopDesc::biased_lock_alignment; duke@435: size_t aligned_size = size + (alignment - sizeof(intptr_t)); zgu@3900: void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) nloodin@4183: : AllocateHeap(aligned_size, flags, CURRENT_PC, nloodin@4183: AllocFailStrategy::RETURN_NULL); duke@435: void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); duke@435: assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= duke@435: ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), duke@435: "JavaThread alignment code overflowed allocated storage"); duke@435: if (TraceBiasedLocking) { duke@435: if (aligned_addr != real_malloc_addr) duke@435: tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, duke@435: real_malloc_addr, aligned_addr); duke@435: } duke@435: ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; duke@435: return aligned_addr; duke@435: } else { zgu@3900: return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) nloodin@4183: : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); duke@435: } duke@435: } duke@435: duke@435: void Thread::operator delete(void* p) { duke@435: if (UseBiasedLocking) { duke@435: void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; zgu@3900: FreeHeap(real_malloc_addr, mtThread); duke@435: } else { zgu@3900: FreeHeap(p, mtThread); duke@435: } duke@435: } duke@435: duke@435: duke@435: // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, duke@435: // JavaThread duke@435: duke@435: duke@435: Thread::Thread() { phh@2423: // stack and get_thread phh@2423: set_stack_base(NULL); phh@2423: set_stack_size(0); phh@2423: set_self_raw_id(0); phh@2423: set_lgrp_id(-1); duke@435: duke@435: // allocated data structures phh@2423: set_osthread(NULL); zgu@3900: set_resource_area(new (mtThread)ResourceArea()); fparain@5409: DEBUG_ONLY(_current_resource_mark = NULL;) zgu@3900: set_handle_area(new (mtThread) HandleArea(NULL)); iklam@5300: set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray(30, true)); duke@435: set_active_handles(NULL); duke@435: set_free_handle_block(NULL); duke@435: set_last_handle_mark(NULL); duke@435: duke@435: // This initial value ==> never claimed. duke@435: _oops_do_parity = 0; duke@435: duke@435: // the handle mark links itself to last_handle_mark dcubed@4967: new HandleMark(this); dcubed@4967: duke@435: // plain initialization duke@435: debug_only(_owned_locks = NULL;) duke@435: debug_only(_allow_allocation_count = 0;) duke@435: NOT_PRODUCT(_allow_safepoint_count = 0;) ysr@1241: NOT_PRODUCT(_skip_gcalot = false;) duke@435: CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) duke@435: _jvmti_env_iteration_count = 0; phh@2423: set_allocated_bytes(0); duke@435: _vm_operation_started_count = 0; duke@435: _vm_operation_completed_count = 0; duke@435: _current_pending_monitor = NULL; duke@435: _current_pending_monitor_is_from_java = true; duke@435: _current_waiting_monitor = NULL; duke@435: _num_nested_signal = 0; duke@435: omFreeList = NULL ; duke@435: omFreeCount = 0 ; duke@435: omFreeProvision = 32 ; acorn@1942: omInUseList = NULL ; acorn@1942: omInUseCount = 0 ; duke@435: never@3632: #ifdef ASSERT never@3632: _visited_for_critical_count = false; never@3632: #endif never@3632: duke@435: _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); duke@435: _suspend_flags = 0; duke@435: duke@435: // thread-specific hashCode stream generator state - Marsaglia shift-xor form duke@435: _hashStateX = os::random() ; duke@435: _hashStateY = 842502087 ; duke@435: _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; duke@435: _hashStateW = 273326509 ; duke@435: duke@435: _OnTrap = 0 ; duke@435: _schedctl = NULL ; duke@435: _Stalled = 0 ; duke@435: _TypeTag = 0x2BAD ; duke@435: duke@435: // Many of the following fields are effectively final - immutable duke@435: // Note that nascent threads can't use the Native Monitor-Mutex duke@435: // construct until the _MutexEvent is initialized ... duke@435: // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents duke@435: // we might instead use a stack of ParkEvents that we could provision on-demand. duke@435: // The stack would act as a cache to avoid calls to ParkEvent::Allocate() duke@435: // and ::Release() duke@435: _ParkEvent = ParkEvent::Allocate (this) ; duke@435: _SleepEvent = ParkEvent::Allocate (this) ; duke@435: _MutexEvent = ParkEvent::Allocate (this) ; duke@435: _MuxEvent = ParkEvent::Allocate (this) ; duke@435: duke@435: #ifdef CHECK_UNHANDLED_OOPS duke@435: if (CheckUnhandledOops) { duke@435: _unhandled_oops = new UnhandledOops(this); duke@435: } duke@435: #endif // CHECK_UNHANDLED_OOPS duke@435: #ifdef ASSERT duke@435: if (UseBiasedLocking) { duke@435: assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); duke@435: assert(this == _real_malloc_address || duke@435: this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), duke@435: "bug in forced alignment of thread objects"); duke@435: } duke@435: #endif /* ASSERT */ duke@435: } duke@435: duke@435: void Thread::initialize_thread_local_storage() { duke@435: // Note: Make sure this method only calls duke@435: // non-blocking operations. Otherwise, it might not work duke@435: // with the thread-startup/safepoint interaction. duke@435: duke@435: // During Java thread startup, safepoint code should allow this duke@435: // method to complete because it may need to allocate memory to duke@435: // store information for the new thread. duke@435: duke@435: // initialize structure dependent on thread local storage duke@435: ThreadLocalStorage::set_thread(this); duke@435: } duke@435: duke@435: void Thread::record_stack_base_and_size() { duke@435: set_stack_base(os::current_stack_base()); duke@435: set_stack_size(os::current_stack_size()); zgu@4079: // CR 7190089: on Solaris, primordial thread's stack is adjusted zgu@4079: // in initialize_thread(). Without the adjustment, stack size is zgu@4079: // incorrect if stack is set to unlimited (ulimit -s unlimited). zgu@4079: // So far, only Solaris has real implementation of initialize_thread(). zgu@4079: // zgu@4079: // set up any platform-specific state. zgu@4079: os::initialize_thread(this); zgu@4079: jprovino@4165: #if INCLUDE_NMT zgu@4193: // record thread's native stack, stack grows downward zgu@4193: address stack_low_addr = stack_base() - stack_size(); zgu@4193: MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, zgu@4079: CURRENT_PC); jprovino@4165: #endif // INCLUDE_NMT duke@435: } duke@435: duke@435: duke@435: Thread::~Thread() { duke@435: // Reclaim the objectmonitors from the omFreeList of the moribund thread. duke@435: ObjectSynchronizer::omFlush (this) ; duke@435: mgronlun@5673: EVENT_THREAD_DESTRUCT(this); mgronlun@5673: zgu@4057: // stack_base can be NULL if the thread is never started or exited before zgu@4057: // record_stack_base_and_size called. Although, we would like to ensure zgu@4057: // that all started threads do call record_stack_base_and_size(), there is zgu@4057: // not proper way to enforce that. jprovino@4165: #if INCLUDE_NMT zgu@4057: if (_stack_base != NULL) { zgu@4057: address low_stack_addr = stack_base() - stack_size(); zgu@4057: MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); zgu@4193: #ifdef ASSERT zgu@4193: set_stack_base(NULL); zgu@4193: #endif zgu@4057: } jprovino@4165: #endif // INCLUDE_NMT zgu@3900: duke@435: // deallocate data structures duke@435: delete resource_area(); duke@435: // since the handle marks are using the handle area, we have to deallocated the root duke@435: // handle mark before deallocating the thread's handle area, duke@435: assert(last_handle_mark() != NULL, "check we have an element"); dcubed@4967: delete last_handle_mark(); dcubed@4967: assert(last_handle_mark() == NULL, "check we have reached the end"); duke@435: duke@435: // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. duke@435: // We NULL out the fields for good hygiene. duke@435: ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; duke@435: ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; duke@435: ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; duke@435: ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; duke@435: duke@435: delete handle_area(); coleenp@4037: delete metadata_handles(); duke@435: duke@435: // osthread() can be NULL, if creation of thread failed. duke@435: if (osthread() != NULL) os::free_thread(osthread()); duke@435: duke@435: delete _SR_lock; duke@435: duke@435: // clear thread local storage if the Thread is deleting itself duke@435: if (this == Thread::current()) { duke@435: ThreadLocalStorage::set_thread(NULL); duke@435: } else { duke@435: // In the case where we're not the current thread, invalidate all the duke@435: // caches in case some code tries to get the current thread or the duke@435: // thread that was destroyed, and gets stale information. duke@435: ThreadLocalStorage::invalidate_all(); duke@435: } duke@435: CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) duke@435: } duke@435: duke@435: // NOTE: dummy function for assertion purpose. duke@435: void Thread::run() { duke@435: ShouldNotReachHere(); duke@435: } duke@435: duke@435: #ifdef ASSERT duke@435: // Private method to check for dangling thread pointer duke@435: void check_for_dangling_thread_pointer(Thread *thread) { duke@435: assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), duke@435: "possibility of dangling Thread pointer"); duke@435: } duke@435: #endif duke@435: duke@435: duke@435: #ifndef PRODUCT duke@435: // Tracing method for basic thread operations duke@435: void Thread::trace(const char* msg, const Thread* const thread) { duke@435: if (!TraceThreadEvents) return; duke@435: ResourceMark rm; duke@435: ThreadCritical tc; duke@435: const char *name = "non-Java thread"; duke@435: int prio = -1; duke@435: if (thread->is_Java_thread() duke@435: && !thread->is_Compiler_thread()) { duke@435: // The Threads_lock must be held to get information about duke@435: // this thread but may not be in some situations when duke@435: // tracing thread events. duke@435: bool release_Threads_lock = false; duke@435: if (!Threads_lock->owned_by_self()) { duke@435: Threads_lock->lock(); duke@435: release_Threads_lock = true; duke@435: } duke@435: JavaThread* jt = (JavaThread *)thread; duke@435: name = (char *)jt->get_thread_name(); duke@435: oop thread_oop = jt->threadObj(); duke@435: if (thread_oop != NULL) { duke@435: prio = java_lang_Thread::priority(thread_oop); duke@435: } duke@435: if (release_Threads_lock) { duke@435: Threads_lock->unlock(); duke@435: } duke@435: } duke@435: tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); duke@435: } duke@435: #endif duke@435: duke@435: duke@435: ThreadPriority Thread::get_priority(const Thread* const thread) { duke@435: trace("get priority", thread); duke@435: ThreadPriority priority; duke@435: // Can return an error! duke@435: (void)os::get_priority(thread, priority); duke@435: assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); duke@435: return priority; duke@435: } duke@435: duke@435: void Thread::set_priority(Thread* thread, ThreadPriority priority) { duke@435: trace("set priority", thread); duke@435: debug_only(check_for_dangling_thread_pointer(thread);) duke@435: // Can return an error! duke@435: (void)os::set_priority(thread, priority); duke@435: } duke@435: duke@435: duke@435: void Thread::start(Thread* thread) { duke@435: trace("start", thread); duke@435: // Start is different from resume in that its safety is guaranteed by context or duke@435: // being called from a Java method synchronized on the Thread object. duke@435: if (!DisableStartThread) { duke@435: if (thread->is_Java_thread()) { duke@435: // Initialize the thread state to RUNNABLE before starting this thread. duke@435: // Can not set it after the thread started because we do not know the duke@435: // exact thread state at that time. It could be in MONITOR_WAIT or duke@435: // in SLEEPING or some other state. duke@435: java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), duke@435: java_lang_Thread::RUNNABLE); duke@435: } duke@435: os::start_thread(thread); duke@435: } duke@435: } duke@435: duke@435: // Enqueue a VM_Operation to do the job for us - sometime later duke@435: void Thread::send_async_exception(oop java_thread, oop java_throwable) { duke@435: VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); duke@435: VMThread::execute(vm_stop); duke@435: } duke@435: duke@435: duke@435: // duke@435: // Check if an external suspend request has completed (or has been duke@435: // cancelled). Returns true if the thread is externally suspended and duke@435: // false otherwise. duke@435: // duke@435: // The bits parameter returns information about the code path through duke@435: // the routine. Useful for debugging: duke@435: // duke@435: // set in is_ext_suspend_completed(): duke@435: // 0x00000001 - routine was entered duke@435: // 0x00000010 - routine return false at end duke@435: // 0x00000100 - thread exited (return false) duke@435: // 0x00000200 - suspend request cancelled (return false) duke@435: // 0x00000400 - thread suspended (return true) duke@435: // 0x00001000 - thread is in a suspend equivalent state (return true) duke@435: // 0x00002000 - thread is native and walkable (return true) duke@435: // 0x00004000 - thread is native_trans and walkable (needed retry) duke@435: // duke@435: // set in wait_for_ext_suspend_completion(): duke@435: // 0x00010000 - routine was entered duke@435: // 0x00020000 - suspend request cancelled before loop (return false) duke@435: // 0x00040000 - thread suspended before loop (return true) duke@435: // 0x00080000 - suspend request cancelled in loop (return false) duke@435: // 0x00100000 - thread suspended in loop (return true) duke@435: // 0x00200000 - suspend not completed during retry loop (return false) duke@435: // duke@435: duke@435: // Helper class for tracing suspend wait debug bits. duke@435: // duke@435: // 0x00000100 indicates that the target thread exited before it could duke@435: // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and duke@435: // 0x00080000 each indicate a cancelled suspend request so they don't duke@435: // count as wait failures either. duke@435: #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) duke@435: duke@435: class TraceSuspendDebugBits : public StackObj { duke@435: private: duke@435: JavaThread * jt; duke@435: bool is_wait; duke@435: bool called_by_wait; // meaningful when !is_wait duke@435: uint32_t * bits; duke@435: duke@435: public: duke@435: TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, duke@435: uint32_t *_bits) { duke@435: jt = _jt; duke@435: is_wait = _is_wait; duke@435: called_by_wait = _called_by_wait; duke@435: bits = _bits; duke@435: } duke@435: duke@435: ~TraceSuspendDebugBits() { duke@435: if (!is_wait) { duke@435: #if 1 duke@435: // By default, don't trace bits for is_ext_suspend_completed() calls. duke@435: // That trace is very chatty. duke@435: return; duke@435: #else duke@435: if (!called_by_wait) { duke@435: // If tracing for is_ext_suspend_completed() is enabled, then only duke@435: // trace calls to it from wait_for_ext_suspend_completion() duke@435: return; duke@435: } duke@435: #endif duke@435: } duke@435: duke@435: if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { duke@435: if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { duke@435: MutexLocker ml(Threads_lock); // needed for get_thread_name() duke@435: ResourceMark rm; duke@435: duke@435: tty->print_cr( duke@435: "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", duke@435: jt->get_thread_name(), *bits); duke@435: duke@435: guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); duke@435: } duke@435: } duke@435: } duke@435: }; duke@435: #undef DEBUG_FALSE_BITS duke@435: duke@435: duke@435: bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { duke@435: TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); duke@435: duke@435: bool did_trans_retry = false; // only do thread_in_native_trans retry once duke@435: bool do_trans_retry; // flag to force the retry duke@435: duke@435: *bits |= 0x00000001; duke@435: duke@435: do { duke@435: do_trans_retry = false; duke@435: duke@435: if (is_exiting()) { duke@435: // Thread is in the process of exiting. This is always checked duke@435: // first to reduce the risk of dereferencing a freed JavaThread. duke@435: *bits |= 0x00000100; duke@435: return false; duke@435: } duke@435: duke@435: if (!is_external_suspend()) { duke@435: // Suspend request is cancelled. This is always checked before duke@435: // is_ext_suspended() to reduce the risk of a rogue resume duke@435: // confusing the thread that made the suspend request. duke@435: *bits |= 0x00000200; duke@435: return false; duke@435: } duke@435: duke@435: if (is_ext_suspended()) { duke@435: // thread is suspended duke@435: *bits |= 0x00000400; duke@435: return true; duke@435: } duke@435: duke@435: // Now that we no longer do hard suspends of threads running duke@435: // native code, the target thread can be changing thread state duke@435: // while we are in this routine: duke@435: // duke@435: // _thread_in_native -> _thread_in_native_trans -> _thread_blocked duke@435: // duke@435: // We save a copy of the thread state as observed at this moment duke@435: // and make our decision about suspend completeness based on the duke@435: // copy. This closes the race where the thread state is seen as duke@435: // _thread_in_native_trans in the if-thread_blocked check, but is duke@435: // seen as _thread_blocked in if-thread_in_native_trans check. duke@435: JavaThreadState save_state = thread_state(); duke@435: duke@435: if (save_state == _thread_blocked && is_suspend_equivalent()) { duke@435: // If the thread's state is _thread_blocked and this blocking duke@435: // condition is known to be equivalent to a suspend, then we can duke@435: // consider the thread to be externally suspended. This means that duke@435: // the code that sets _thread_blocked has been modified to do duke@435: // self-suspension if the blocking condition releases. We also duke@435: // used to check for CONDVAR_WAIT here, but that is now covered by duke@435: // the _thread_blocked with self-suspension check. duke@435: // duke@435: // Return true since we wouldn't be here unless there was still an duke@435: // external suspend request. duke@435: *bits |= 0x00001000; duke@435: return true; duke@435: } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { duke@435: // Threads running native code will self-suspend on native==>VM/Java duke@435: // transitions. If its stack is walkable (should always be the case duke@435: // unless this function is called before the actual java_suspend() duke@435: // call), then the wait is done. duke@435: *bits |= 0x00002000; duke@435: return true; duke@435: } else if (!called_by_wait && !did_trans_retry && duke@435: save_state == _thread_in_native_trans && duke@435: frame_anchor()->walkable()) { duke@435: // The thread is transitioning from thread_in_native to another duke@435: // thread state. check_safepoint_and_suspend_for_native_trans() duke@435: // will force the thread to self-suspend. If it hasn't gotten duke@435: // there yet we may have caught the thread in-between the native duke@435: // code check above and the self-suspend. Lucky us. If we were duke@435: // called by wait_for_ext_suspend_completion(), then it duke@435: // will be doing the retries so we don't have to. duke@435: // duke@435: // Since we use the saved thread state in the if-statement above, duke@435: // there is a chance that the thread has already transitioned to duke@435: // _thread_blocked by the time we get here. In that case, we will duke@435: // make a single unnecessary pass through the logic below. This duke@435: // doesn't hurt anything since we still do the trans retry. duke@435: duke@435: *bits |= 0x00004000; duke@435: duke@435: // Once the thread leaves thread_in_native_trans for another duke@435: // thread state, we break out of this retry loop. We shouldn't duke@435: // need this flag to prevent us from getting back here, but duke@435: // sometimes paranoia is good. duke@435: did_trans_retry = true; duke@435: duke@435: // We wait for the thread to transition to a more usable state. duke@435: for (int i = 1; i <= SuspendRetryCount; i++) { duke@435: // We used to do an "os::yield_all(i)" call here with the intention duke@435: // that yielding would increase on each retry. However, the parameter duke@435: // is ignored on Linux which means the yield didn't scale up. Waiting duke@435: // on the SR_lock below provides a much more predictable scale up for duke@435: // the delay. It also provides a simple/direct point to check for any duke@435: // safepoint requests from the VMThread duke@435: duke@435: // temporarily drops SR_lock while doing wait with safepoint check duke@435: // (if we're a JavaThread - the WatcherThread can also call this) duke@435: // and increase delay with each retry duke@435: SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); duke@435: duke@435: // check the actual thread state instead of what we saved above duke@435: if (thread_state() != _thread_in_native_trans) { duke@435: // the thread has transitioned to another thread state so duke@435: // try all the checks (except this one) one more time. duke@435: do_trans_retry = true; duke@435: break; duke@435: } duke@435: } // end retry loop duke@435: duke@435: duke@435: } duke@435: } while (do_trans_retry); duke@435: duke@435: *bits |= 0x00000010; duke@435: return false; duke@435: } duke@435: duke@435: // duke@435: // Wait for an external suspend request to complete (or be cancelled). duke@435: // Returns true if the thread is externally suspended and false otherwise. duke@435: // duke@435: bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, duke@435: uint32_t *bits) { duke@435: TraceSuspendDebugBits tsdb(this, true /* is_wait */, duke@435: false /* !called_by_wait */, bits); duke@435: duke@435: // local flag copies to minimize SR_lock hold time duke@435: bool is_suspended; duke@435: bool pending; duke@435: uint32_t reset_bits; duke@435: duke@435: // set a marker so is_ext_suspend_completed() knows we are the caller duke@435: *bits |= 0x00010000; duke@435: duke@435: // We use reset_bits to reinitialize the bits value at the top of duke@435: // each retry loop. This allows the caller to make use of any duke@435: // unused bits for their own marking purposes. duke@435: reset_bits = *bits; duke@435: duke@435: { duke@435: MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); duke@435: is_suspended = is_ext_suspend_completed(true /* called_by_wait */, duke@435: delay, bits); duke@435: pending = is_external_suspend(); duke@435: } duke@435: // must release SR_lock to allow suspension to complete duke@435: duke@435: if (!pending) { duke@435: // A cancelled suspend request is the only false return from duke@435: // is_ext_suspend_completed() that keeps us from entering the duke@435: // retry loop. duke@435: *bits |= 0x00020000; duke@435: return false; duke@435: } duke@435: duke@435: if (is_suspended) { duke@435: *bits |= 0x00040000; duke@435: return true; duke@435: } duke@435: duke@435: for (int i = 1; i <= retries; i++) { duke@435: *bits = reset_bits; // reinit to only track last retry duke@435: duke@435: // We used to do an "os::yield_all(i)" call here with the intention duke@435: // that yielding would increase on each retry. However, the parameter duke@435: // is ignored on Linux which means the yield didn't scale up. Waiting duke@435: // on the SR_lock below provides a much more predictable scale up for duke@435: // the delay. It also provides a simple/direct point to check for any duke@435: // safepoint requests from the VMThread duke@435: duke@435: { duke@435: MutexLocker ml(SR_lock()); duke@435: // wait with safepoint check (if we're a JavaThread - the WatcherThread duke@435: // can also call this) and increase delay with each retry duke@435: SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); duke@435: duke@435: is_suspended = is_ext_suspend_completed(true /* called_by_wait */, duke@435: delay, bits); duke@435: duke@435: // It is possible for the external suspend request to be cancelled duke@435: // (by a resume) before the actual suspend operation is completed. duke@435: // Refresh our local copy to see if we still need to wait. duke@435: pending = is_external_suspend(); duke@435: } duke@435: duke@435: if (!pending) { duke@435: // A cancelled suspend request is the only false return from duke@435: // is_ext_suspend_completed() that keeps us from staying in the duke@435: // retry loop. duke@435: *bits |= 0x00080000; duke@435: return false; duke@435: } duke@435: duke@435: if (is_suspended) { duke@435: *bits |= 0x00100000; duke@435: return true; duke@435: } duke@435: } // end retry loop duke@435: duke@435: // thread did not suspend after all our retries duke@435: *bits |= 0x00200000; duke@435: return false; duke@435: } duke@435: duke@435: #ifndef PRODUCT duke@435: void JavaThread::record_jump(address target, address instr, const char* file, int line) { duke@435: duke@435: // This should not need to be atomic as the only way for simultaneous duke@435: // updates is via interrupts. Even then this should be rare or non-existant duke@435: // and we don't care that much anyway. duke@435: duke@435: int index = _jmp_ring_index; duke@435: _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); duke@435: _jmp_ring[index]._target = (intptr_t) target; duke@435: _jmp_ring[index]._instruction = (intptr_t) instr; duke@435: _jmp_ring[index]._file = file; duke@435: _jmp_ring[index]._line = line; duke@435: } duke@435: #endif /* PRODUCT */ duke@435: duke@435: // Called by flat profiler duke@435: // Callers have already called wait_for_ext_suspend_completion duke@435: // The assertion for that is currently too complex to put here: duke@435: bool JavaThread::profile_last_Java_frame(frame* _fr) { duke@435: bool gotframe = false; duke@435: // self suspension saves needed state. duke@435: if (has_last_Java_frame() && _anchor.walkable()) { duke@435: *_fr = pd_last_frame(); duke@435: gotframe = true; duke@435: } duke@435: return gotframe; duke@435: } duke@435: duke@435: void Thread::interrupt(Thread* thread) { duke@435: trace("interrupt", thread); duke@435: debug_only(check_for_dangling_thread_pointer(thread);) duke@435: os::interrupt(thread); duke@435: } duke@435: duke@435: bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { duke@435: trace("is_interrupted", thread); duke@435: debug_only(check_for_dangling_thread_pointer(thread);) duke@435: // Note: If clear_interrupted==false, this simply fetches and duke@435: // returns the value of the field osthread()->interrupted(). duke@435: return os::is_interrupted(thread, clear_interrupted); duke@435: } duke@435: duke@435: duke@435: // GC Support duke@435: bool Thread::claim_oops_do_par_case(int strong_roots_parity) { duke@435: jint thread_parity = _oops_do_parity; duke@435: if (thread_parity != strong_roots_parity) { duke@435: jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); johnc@3175: if (res == thread_parity) { johnc@3175: return true; johnc@3175: } else { duke@435: guarantee(res == strong_roots_parity, "Or else what?"); jmasa@3294: assert(SharedHeap::heap()->workers()->active_workers() > 0, jmasa@3294: "Should only fail when parallel."); duke@435: return false; duke@435: } duke@435: } jmasa@3294: assert(SharedHeap::heap()->workers()->active_workers() > 0, duke@435: "Should only fail when parallel."); duke@435: return false; duke@435: } duke@435: stefank@4298: void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { duke@435: active_handles()->oops_do(f); duke@435: // Do oop for ThreadShadow duke@435: f->do_oop((oop*)&_pending_exception); duke@435: handle_area()->oops_do(f); duke@435: } duke@435: jrose@1424: void Thread::nmethods_do(CodeBlobClosure* cf) { jrose@1424: // no nmethods in a generic thread... duke@435: } duke@435: coleenp@4037: void Thread::metadata_do(void f(Metadata*)) { coleenp@4037: if (metadata_handles() != NULL) { coleenp@4037: for (int i = 0; i< metadata_handles()->length(); i++) { coleenp@4037: f(metadata_handles()->at(i)); coleenp@4037: } coleenp@4037: } coleenp@4037: } coleenp@4037: duke@435: void Thread::print_on(outputStream* st) const { duke@435: // get_priority assumes osthread initialized duke@435: if (osthread() != NULL) { dholmes@4077: int os_prio; dholmes@4077: if (os::get_native_priority(this, &os_prio) == OS_OK) { dholmes@4077: st->print("os_prio=%d ", os_prio); dholmes@4077: } dholmes@4077: st->print("tid=" INTPTR_FORMAT " ", this); duke@435: osthread()->print_on(st); duke@435: } duke@435: debug_only(if (WizardMode) print_owned_locks_on(st);) duke@435: } duke@435: duke@435: // Thread::print_on_error() is called by fatal error handler. Don't use duke@435: // any lock or allocate memory. duke@435: void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { duke@435: if (is_VM_thread()) st->print("VMThread"); duke@435: else if (is_Compiler_thread()) st->print("CompilerThread"); duke@435: else if (is_Java_thread()) st->print("JavaThread"); duke@435: else if (is_GC_task_thread()) st->print("GCTaskThread"); duke@435: else if (is_Watcher_thread()) st->print("WatcherThread"); duke@435: else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); duke@435: else st->print("Thread"); duke@435: duke@435: st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", duke@435: _stack_base - _stack_size, _stack_base); duke@435: duke@435: if (osthread()) { duke@435: st->print(" [id=%d]", osthread()->thread_id()); duke@435: } duke@435: } duke@435: duke@435: #ifdef ASSERT duke@435: void Thread::print_owned_locks_on(outputStream* st) const { duke@435: Monitor *cur = _owned_locks; duke@435: if (cur == NULL) { duke@435: st->print(" (no locks) "); duke@435: } else { duke@435: st->print_cr(" Locks owned:"); duke@435: while(cur) { duke@435: cur->print_on(st); duke@435: cur = cur->next(); duke@435: } duke@435: } duke@435: } duke@435: duke@435: static int ref_use_count = 0; duke@435: duke@435: bool Thread::owns_locks_but_compiled_lock() const { duke@435: for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { duke@435: if (cur != Compile_lock) return true; duke@435: } duke@435: return false; duke@435: } duke@435: duke@435: duke@435: #endif duke@435: duke@435: #ifndef PRODUCT duke@435: duke@435: // The flag: potential_vm_operation notifies if this particular safepoint state could potential duke@435: // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that duke@435: // no threads which allow_vm_block's are held duke@435: void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { duke@435: // Check if current thread is allowed to block at a safepoint duke@435: if (!(_allow_safepoint_count == 0)) duke@435: fatal("Possible safepoint reached by thread that does not allow it"); duke@435: if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { duke@435: fatal("LEAF method calling lock?"); duke@435: } duke@435: duke@435: #ifdef ASSERT duke@435: if (potential_vm_operation && is_Java_thread() duke@435: && !Universe::is_bootstrapping()) { duke@435: // Make sure we do not hold any locks that the VM thread also uses. duke@435: // This could potentially lead to deadlocks duke@435: for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { duke@435: // Threads_lock is special, since the safepoint synchronization will not start before this is duke@435: // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, duke@435: // since it is used to transfer control between JavaThreads and the VMThread duke@435: // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! duke@435: if ( (cur->allow_vm_block() && duke@435: cur != Threads_lock && duke@435: cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation duke@435: cur != VMOperationRequest_lock && duke@435: cur != VMOperationQueue_lock) || duke@435: cur->rank() == Mutex::special) { duke@435: warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); duke@435: } duke@435: } duke@435: } duke@435: duke@435: if (GCALotAtAllSafepoints) { duke@435: // We could enter a safepoint here and thus have a gc duke@435: InterfaceSupport::check_gc_alot(); duke@435: } duke@435: #endif duke@435: } duke@435: #endif duke@435: duke@435: bool Thread::is_in_stack(address adr) const { duke@435: assert(Thread::current() == this, "is_in_stack can only be called from current thread"); duke@435: address end = os::current_stack_pointer(); coleenp@4037: // Allow non Java threads to call this without stack_base coleenp@4037: if (_stack_base == NULL) return true; duke@435: if (stack_base() >= adr && adr >= end) return true; duke@435: duke@435: return false; duke@435: } duke@435: duke@435: rbackman@5419: bool Thread::is_in_usable_stack(address adr) const { rbackman@5419: size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; rbackman@5419: size_t usable_stack_size = _stack_size - stack_guard_size; rbackman@5419: rbackman@5419: return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); rbackman@5419: } rbackman@5419: rbackman@5419: duke@435: // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter duke@435: // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being duke@435: // used for compilation in the future. If that change is made, the need for these methods duke@435: // should be revisited, and they should be removed if possible. duke@435: duke@435: bool Thread::is_lock_owned(address adr) const { kvn@2043: return on_local_stack(adr); duke@435: } duke@435: duke@435: bool Thread::set_as_starting_thread() { duke@435: // NOTE: this must be called inside the main thread. duke@435: return os::create_main_thread((JavaThread*)this); duke@435: } duke@435: coleenp@2497: static void initialize_class(Symbol* class_name, TRAPS) { coleenp@4037: Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); coleenp@4037: InstanceKlass::cast(klass)->initialize(CHECK); duke@435: } duke@435: duke@435: duke@435: // Creates the initial ThreadGroup duke@435: static Handle create_initial_thread_group(TRAPS) { coleenp@4037: Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); duke@435: instanceKlassHandle klass (THREAD, k); duke@435: duke@435: Handle system_instance = klass->allocate_instance_handle(CHECK_NH); duke@435: { duke@435: JavaValue result(T_VOID); duke@435: JavaCalls::call_special(&result, duke@435: system_instance, duke@435: klass, coleenp@2497: vmSymbols::object_initializer_name(), coleenp@2497: vmSymbols::void_method_signature(), duke@435: CHECK_NH); duke@435: } duke@435: Universe::set_system_thread_group(system_instance()); duke@435: duke@435: Handle main_instance = klass->allocate_instance_handle(CHECK_NH); duke@435: { duke@435: JavaValue result(T_VOID); duke@435: Handle string = java_lang_String::create_from_str("main", CHECK_NH); duke@435: JavaCalls::call_special(&result, duke@435: main_instance, duke@435: klass, coleenp@2497: vmSymbols::object_initializer_name(), coleenp@2497: vmSymbols::threadgroup_string_void_signature(), duke@435: system_instance, duke@435: string, duke@435: CHECK_NH); duke@435: } duke@435: return main_instance; duke@435: } duke@435: duke@435: // Creates the initial Thread duke@435: static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { coleenp@4037: Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); duke@435: instanceKlassHandle klass (THREAD, k); duke@435: instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); duke@435: duke@435: java_lang_Thread::set_thread(thread_oop(), thread); duke@435: java_lang_Thread::set_priority(thread_oop(), NormPriority); duke@435: thread->set_threadObj(thread_oop()); duke@435: duke@435: Handle string = java_lang_String::create_from_str("main", CHECK_NULL); duke@435: duke@435: JavaValue result(T_VOID); duke@435: JavaCalls::call_special(&result, thread_oop, duke@435: klass, coleenp@2497: vmSymbols::object_initializer_name(), coleenp@2497: vmSymbols::threadgroup_string_void_signature(), duke@435: thread_group, duke@435: string, duke@435: CHECK_NULL); duke@435: return thread_oop(); duke@435: } duke@435: duke@435: static void call_initializeSystemClass(TRAPS) { coleenp@4037: Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); duke@435: instanceKlassHandle klass (THREAD, k); duke@435: duke@435: JavaValue result(T_VOID); coleenp@2497: JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), coleenp@2497: vmSymbols::void_method_signature(), CHECK); duke@435: } duke@435: twisti@3884: char java_runtime_name[128] = ""; sla@4232: char java_runtime_version[128] = ""; twisti@3884: twisti@3884: // extract the JRE name from sun.misc.Version.java_runtime_name twisti@3884: static const char* get_java_runtime_name(TRAPS) { coleenp@4037: Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), twisti@3884: Handle(), Handle(), CHECK_AND_CLEAR_NULL); twisti@3884: fieldDescriptor fd; twisti@3884: bool found = k != NULL && coleenp@4037: InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), twisti@3884: vmSymbols::string_signature(), &fd); twisti@3884: if (found) { twisti@3884: oop name_oop = k->java_mirror()->obj_field(fd.offset()); twisti@3884: if (name_oop == NULL) twisti@3884: return NULL; twisti@3884: const char* name = java_lang_String::as_utf8_string(name_oop, twisti@3884: java_runtime_name, twisti@3884: sizeof(java_runtime_name)); twisti@3884: return name; twisti@3884: } else { twisti@3884: return NULL; twisti@3884: } twisti@3884: } twisti@3884: sla@4232: // extract the JRE version from sun.misc.Version.java_runtime_version sla@4232: static const char* get_java_runtime_version(TRAPS) { sla@4232: Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), sla@4232: Handle(), Handle(), CHECK_AND_CLEAR_NULL); sla@4232: fieldDescriptor fd; sla@4232: bool found = k != NULL && sla@4232: InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), sla@4232: vmSymbols::string_signature(), &fd); sla@4232: if (found) { sla@4232: oop name_oop = k->java_mirror()->obj_field(fd.offset()); sla@4232: if (name_oop == NULL) sla@4232: return NULL; sla@4232: const char* name = java_lang_String::as_utf8_string(name_oop, sla@4232: java_runtime_version, sla@4232: sizeof(java_runtime_version)); sla@4232: return name; sla@4232: } else { sla@4232: return NULL; sla@4232: } sla@4232: } sla@4232: kevinw@2449: // General purpose hook into Java code, run once when the VM is initialized. kevinw@2449: // The Java library method itself may be changed independently from the VM. kevinw@2449: static void call_postVMInitHook(TRAPS) { coleenp@4037: Klass* k = SystemDictionary::PostVMInitHook_klass(); kevinw@2449: instanceKlassHandle klass (THREAD, k); kevinw@2449: if (klass.not_null()) { kevinw@2449: JavaValue result(T_VOID); coleenp@2497: JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), coleenp@2497: vmSymbols::void_method_signature(), kevinw@2449: CHECK); kevinw@2449: } kevinw@2449: } kevinw@2449: duke@435: static void reset_vm_info_property(TRAPS) { duke@435: // the vm info string duke@435: ResourceMark rm(THREAD); duke@435: const char *vm_info = VM_Version::vm_info_string(); duke@435: duke@435: // java.lang.System class coleenp@4037: Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); duke@435: instanceKlassHandle klass (THREAD, k); duke@435: duke@435: // setProperty arguments duke@435: Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); duke@435: Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); duke@435: duke@435: // return value duke@435: JavaValue r(T_OBJECT); duke@435: duke@435: // public static String setProperty(String key, String value); duke@435: JavaCalls::call_static(&r, duke@435: klass, coleenp@2497: vmSymbols::setProperty_name(), coleenp@2497: vmSymbols::string_string_string_signature(), duke@435: key_str, duke@435: value_str, duke@435: CHECK); duke@435: } duke@435: duke@435: duke@435: void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { duke@435: assert(thread_group.not_null(), "thread group should be specified"); duke@435: assert(threadObj() == NULL, "should only create Java thread object once"); duke@435: coleenp@4037: Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); duke@435: instanceKlassHandle klass (THREAD, k); duke@435: instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); duke@435: duke@435: java_lang_Thread::set_thread(thread_oop(), this); duke@435: java_lang_Thread::set_priority(thread_oop(), NormPriority); duke@435: set_threadObj(thread_oop()); duke@435: duke@435: JavaValue result(T_VOID); duke@435: if (thread_name != NULL) { duke@435: Handle name = java_lang_String::create_from_str(thread_name, CHECK); duke@435: // Thread gets assigned specified name and null target duke@435: JavaCalls::call_special(&result, duke@435: thread_oop, duke@435: klass, coleenp@2497: vmSymbols::object_initializer_name(), coleenp@2497: vmSymbols::threadgroup_string_void_signature(), duke@435: thread_group, // Argument 1 duke@435: name, // Argument 2 duke@435: THREAD); duke@435: } else { duke@435: // Thread gets assigned name "Thread-nnn" and null target duke@435: // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) duke@435: JavaCalls::call_special(&result, duke@435: thread_oop, duke@435: klass, coleenp@2497: vmSymbols::object_initializer_name(), coleenp@2497: vmSymbols::threadgroup_runnable_void_signature(), duke@435: thread_group, // Argument 1 duke@435: Handle(), // Argument 2 duke@435: THREAD); duke@435: } duke@435: duke@435: duke@435: if (daemon) { duke@435: java_lang_Thread::set_daemon(thread_oop()); duke@435: } duke@435: duke@435: if (HAS_PENDING_EXCEPTION) { duke@435: return; duke@435: } duke@435: never@1577: KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); duke@435: Handle threadObj(this, this->threadObj()); duke@435: duke@435: JavaCalls::call_special(&result, duke@435: thread_group, duke@435: group, coleenp@2497: vmSymbols::add_method_name(), coleenp@2497: vmSymbols::thread_void_signature(), duke@435: threadObj, // Arg 1 duke@435: THREAD); duke@435: duke@435: duke@435: } duke@435: duke@435: // NamedThread -- non-JavaThread subclasses with multiple duke@435: // uniquely named instances should derive from this. duke@435: NamedThread::NamedThread() : Thread() { duke@435: _name = NULL; minqi@1554: _processed_thread = NULL; duke@435: } duke@435: duke@435: NamedThread::~NamedThread() { duke@435: if (_name != NULL) { zgu@3900: FREE_C_HEAP_ARRAY(char, _name, mtThread); duke@435: _name = NULL; duke@435: } duke@435: } duke@435: duke@435: void NamedThread::set_name(const char* format, ...) { duke@435: guarantee(_name == NULL, "Only get to set name once."); zgu@3900: _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); duke@435: guarantee(_name != NULL, "alloc failure"); duke@435: va_list ap; duke@435: va_start(ap, format); duke@435: jio_vsnprintf(_name, max_name_len, format, ap); duke@435: va_end(ap); duke@435: } duke@435: duke@435: // ======= WatcherThread ======== duke@435: duke@435: // The watcher thread exists to simulate timer interrupts. It should duke@435: // be replaced by an abstraction over whatever native support for duke@435: // timer interrupts exists on the platform. duke@435: duke@435: WatcherThread* WatcherThread::_watcher_thread = NULL; rbackman@4250: bool WatcherThread::_startable = false; bobv@2036: volatile bool WatcherThread::_should_terminate = false; duke@435: rbackman@5424: WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { duke@435: assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); duke@435: if (os::create_thread(this, os::watcher_thread)) { duke@435: _watcher_thread = this; duke@435: duke@435: // Set the watcher thread to the highest OS priority which should not be duke@435: // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY duke@435: // is created. The only normal thread using this priority is the reference duke@435: // handler thread, which runs for very short intervals only. duke@435: // If the VMThread's priority is not lower than the WatcherThread profiling duke@435: // will be inaccurate. duke@435: os::set_priority(this, MaxPriority); duke@435: if (!DisableStartThread) { duke@435: os::start_thread(this); duke@435: } duke@435: } duke@435: } duke@435: rbackman@4250: int WatcherThread::sleep() const { rbackman@4250: MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); rbackman@4250: rbackman@4250: // remaining will be zero if there are no tasks, rbackman@4250: // causing the WatcherThread to sleep until a task is rbackman@4250: // enrolled rbackman@4250: int remaining = PeriodicTask::time_to_wait(); rbackman@4250: int time_slept = 0; rbackman@4250: rbackman@4250: // we expect this to timeout - we only ever get unparked when rbackman@4250: // we should terminate or when a new task has been enrolled rbackman@4250: OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); rbackman@4250: rbackman@4250: jlong time_before_loop = os::javaTimeNanos(); rbackman@4250: rbackman@4250: for (;;) { rbackman@4250: bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); rbackman@4250: jlong now = os::javaTimeNanos(); rbackman@4250: rbackman@4250: if (remaining == 0) { rbackman@4250: // if we didn't have any tasks we could have waited for a long time rbackman@4250: // consider the time_slept zero and reset time_before_loop rbackman@4250: time_slept = 0; rbackman@4250: time_before_loop = now; rbackman@4250: } else { rbackman@4250: // need to recalulate since we might have new tasks in _tasks rbackman@4250: time_slept = (int) ((now - time_before_loop) / 1000000); rbackman@4250: } rbackman@4250: rbackman@4250: // Change to task list or spurious wakeup of some kind rbackman@4250: if (timedout || _should_terminate) { rbackman@4250: break; rbackman@4250: } rbackman@4250: rbackman@4250: remaining = PeriodicTask::time_to_wait(); rbackman@4250: if (remaining == 0) { rbackman@4250: // Last task was just disenrolled so loop around and wait until rbackman@4250: // another task gets enrolled rbackman@4250: continue; rbackman@4250: } rbackman@4250: rbackman@4250: remaining -= time_slept; rbackman@4250: if (remaining <= 0) rbackman@4250: break; rbackman@4250: } rbackman@4250: rbackman@4250: return time_slept; rbackman@4250: } rbackman@4250: duke@435: void WatcherThread::run() { duke@435: assert(this == watcher_thread(), "just checking"); duke@435: duke@435: this->record_stack_base_and_size(); duke@435: this->initialize_thread_local_storage(); duke@435: this->set_active_handles(JNIHandleBlock::allocate_block()); duke@435: while(!_should_terminate) { duke@435: assert(watcher_thread() == Thread::current(), "thread consistency check"); duke@435: assert(watcher_thread() == this, "thread consistency check"); duke@435: duke@435: // Calculate how long it'll be until the next PeriodicTask work duke@435: // should be done, and sleep that amount of time. rbackman@4250: int time_waited = sleep(); duke@435: duke@435: if (is_error_reported()) { duke@435: // A fatal error has happened, the error handler(VMError::report_and_die) duke@435: // should abort JVM after creating an error log file. However in some duke@435: // rare cases, the error handler itself might deadlock. Here we try to duke@435: // kill JVM if the fatal error handler fails to abort in 2 minutes. duke@435: // duke@435: // This code is in WatcherThread because WatcherThread wakes up duke@435: // periodically so the fatal error handler doesn't need to do anything; duke@435: // also because the WatcherThread is less likely to crash than other duke@435: // threads. duke@435: duke@435: for (;;) { duke@435: if (!ShowMessageBoxOnError duke@435: && (OnError == NULL || OnError[0] == '\0') duke@435: && Arguments::abort_hook() == NULL) { duke@435: os::sleep(this, 2 * 60 * 1000, false); duke@435: fdStream err(defaultStream::output_fd()); duke@435: err.print_raw_cr("# [ timer expired, abort... ]"); duke@435: // skip atexit/vm_exit/vm_abort hooks duke@435: os::die(); duke@435: } duke@435: duke@435: // Wake up 5 seconds later, the fatal handler may reset OnError or duke@435: // ShowMessageBoxOnError when it is ready to abort. duke@435: os::sleep(this, 5 * 1000, false); duke@435: } duke@435: } duke@435: rbackman@4250: PeriodicTask::real_time_tick(time_waited); duke@435: } duke@435: duke@435: // Signal that it is terminated duke@435: { duke@435: MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); duke@435: _watcher_thread = NULL; duke@435: Terminator_lock->notify(); duke@435: } duke@435: duke@435: // Thread destructor usually does this.. duke@435: ThreadLocalStorage::set_thread(NULL); duke@435: } duke@435: duke@435: void WatcherThread::start() { rbackman@4250: assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); rbackman@4250: rbackman@4250: if (watcher_thread() == NULL && _startable) { duke@435: _should_terminate = false; duke@435: // Create the single instance of WatcherThread duke@435: new WatcherThread(); duke@435: } duke@435: } duke@435: rbackman@4250: void WatcherThread::make_startable() { rbackman@4250: assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); rbackman@4250: _startable = true; rbackman@4250: } rbackman@4250: duke@435: void WatcherThread::stop() { rbackman@4250: { rbackman@4250: MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); rbackman@4250: _should_terminate = true; rbackman@4250: OrderAccess::fence(); // ensure WatcherThread sees update in main loop rbackman@4250: rbackman@4250: WatcherThread* watcher = watcher_thread(); rbackman@4250: if (watcher != NULL) rbackman@4250: watcher->unpark(); rbackman@4250: } rbackman@4250: duke@435: // it is ok to take late safepoints here, if needed duke@435: MutexLocker mu(Terminator_lock); bobv@2036: duke@435: while(watcher_thread() != NULL) { duke@435: // This wait should make safepoint checks, wait without a timeout, duke@435: // and wait as a suspend-equivalent condition. duke@435: // duke@435: // Note: If the FlatProfiler is running, then this thread is waiting duke@435: // for the WatcherThread to terminate and the WatcherThread, via the duke@435: // FlatProfiler task, is waiting for the external suspend request on duke@435: // this thread to complete. wait_for_ext_suspend_completion() will duke@435: // eventually timeout, but that takes time. Making this wait a duke@435: // suspend-equivalent condition solves that timeout problem. duke@435: // duke@435: Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, duke@435: Mutex::_as_suspend_equivalent_flag); duke@435: } duke@435: } duke@435: rbackman@4250: void WatcherThread::unpark() { rbackman@4250: MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); rbackman@4250: PeriodicTask_lock->notify(); rbackman@4250: } rbackman@4250: duke@435: void WatcherThread::print_on(outputStream* st) const { duke@435: st->print("\"%s\" ", name()); duke@435: Thread::print_on(st); duke@435: st->cr(); duke@435: } duke@435: duke@435: // ======= JavaThread ======== duke@435: duke@435: // A JavaThread is a normal Java thread duke@435: duke@435: void JavaThread::initialize() { duke@435: // Initialize fields ysr@777: ysr@777: // Set the claimed par_id to -1 (ie not claiming any par_ids) ysr@777: set_claimed_par_id(-1); ysr@777: duke@435: set_saved_exception_pc(NULL); duke@435: set_threadObj(NULL); duke@435: _anchor.clear(); duke@435: set_entry_point(NULL); duke@435: set_jni_functions(jni_functions()); duke@435: set_callee_target(NULL); duke@435: set_vm_result(NULL); duke@435: set_vm_result_2(NULL); duke@435: set_vframe_array_head(NULL); duke@435: set_vframe_array_last(NULL); duke@435: set_deferred_locals(NULL); duke@435: set_deopt_mark(NULL); iveresov@2169: set_deopt_nmethod(NULL); duke@435: clear_must_deopt_id(); duke@435: set_monitor_chunks(NULL); duke@435: set_next(NULL); duke@435: set_thread_state(_thread_new); jprovino@4165: #if INCLUDE_NMT zgu@3900: set_recorder(NULL); jprovino@4165: #endif duke@435: _terminated = _not_terminated; duke@435: _privileged_stack_top = NULL; duke@435: _array_for_gc = NULL; duke@435: _suspend_equivalent = false; duke@435: _in_deopt_handler = 0; duke@435: _doing_unsafe_access = false; duke@435: _stack_guard_state = stack_guard_unused; duke@435: _exception_oop = NULL; duke@435: _exception_pc = 0; duke@435: _exception_handler_pc = 0; twisti@2258: _is_method_handle_return = 0; duke@435: _jvmti_thread_state= NULL; dcubed@1648: _should_post_on_exceptions_flag = JNI_FALSE; duke@435: _jvmti_get_loaded_classes_closure = NULL; duke@435: _interp_only_mode = 0; duke@435: _special_runtime_exit_condition = _no_async_condition; duke@435: _pending_async_exception = NULL; duke@435: _is_compiling = false; duke@435: _thread_stat = NULL; duke@435: _thread_stat = new ThreadStatistics(); duke@435: _blocked_on_compilation = false; duke@435: _jni_active_critical = 0; duke@435: _do_not_unlock_if_synchronized = false; duke@435: _cached_monitor_info = NULL; duke@435: _parker = Parker::Allocate(this) ; duke@435: duke@435: #ifndef PRODUCT duke@435: _jmp_ring_index = 0; duke@435: for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { duke@435: record_jump(NULL, NULL, NULL, 0); duke@435: } duke@435: #endif /* PRODUCT */ duke@435: duke@435: set_thread_profiler(NULL); duke@435: if (FlatProfiler::is_active()) { duke@435: // This is where we would decide to either give each thread it's own profiler duke@435: // or use one global one from FlatProfiler, duke@435: // or up to some count of the number of profiled threads, etc. duke@435: ThreadProfiler* pp = new ThreadProfiler(); duke@435: pp->engage(); duke@435: set_thread_profiler(pp); duke@435: } duke@435: duke@435: // Setup safepoint state info for this thread duke@435: ThreadSafepointState::create(this); duke@435: duke@435: debug_only(_java_call_counter = 0); duke@435: duke@435: // JVMTI PopFrame support duke@435: _popframe_condition = popframe_inactive; duke@435: _popframe_preserved_args = NULL; duke@435: _popframe_preserved_args_size = 0; duke@435: duke@435: pd_initialize(); duke@435: } duke@435: jprovino@4542: #if INCLUDE_ALL_GCS ysr@777: SATBMarkQueueSet JavaThread::_satb_mark_queue_set; ysr@777: DirtyCardQueueSet JavaThread::_dirty_card_queue_set; jprovino@4542: #endif // INCLUDE_ALL_GCS ysr@777: dcubed@3202: JavaThread::JavaThread(bool is_attaching_via_jni) : ysr@777: Thread() jprovino@4542: #if INCLUDE_ALL_GCS ysr@777: , _satb_mark_queue(&_satb_mark_queue_set), ysr@777: _dirty_card_queue(&_dirty_card_queue_set) jprovino@4542: #endif // INCLUDE_ALL_GCS ysr@777: { duke@435: initialize(); dcubed@3202: if (is_attaching_via_jni) { dcubed@3202: _jni_attach_state = _attaching_via_jni; dcubed@3202: } else { dcubed@3202: _jni_attach_state = _not_attaching_via_jni; dcubed@3202: } johnc@4552: assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); zgu@3900: _safepoint_visible = false; duke@435: } duke@435: duke@435: bool JavaThread::reguard_stack(address cur_sp) { duke@435: if (_stack_guard_state != stack_guard_yellow_disabled) { duke@435: return true; // Stack already guarded or guard pages not needed. duke@435: } duke@435: duke@435: if (register_stack_overflow()) { duke@435: // For those architectures which have separate register and duke@435: // memory stacks, we must check the register stack to see if duke@435: // it has overflowed. duke@435: return false; duke@435: } duke@435: duke@435: // Java code never executes within the yellow zone: the latter is only duke@435: // there to provoke an exception during stack banging. If java code duke@435: // is executing there, either StackShadowPages should be larger, or duke@435: // some exception code in c1, c2 or the interpreter isn't unwinding duke@435: // when it should. duke@435: guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); duke@435: duke@435: enable_stack_yellow_zone(); duke@435: return true; duke@435: } duke@435: duke@435: bool JavaThread::reguard_stack(void) { duke@435: return reguard_stack(os::current_stack_pointer()); duke@435: } duke@435: duke@435: duke@435: void JavaThread::block_if_vm_exited() { duke@435: if (_terminated == _vm_exited) { duke@435: // _vm_exited is set at safepoint, and Threads_lock is never released duke@435: // we will block here forever duke@435: Threads_lock->lock_without_safepoint_check(); duke@435: ShouldNotReachHere(); duke@435: } duke@435: } duke@435: duke@435: duke@435: // Remove this ifdef when C1 is ported to the compiler interface. duke@435: static void compiler_thread_entry(JavaThread* thread, TRAPS); duke@435: ysr@777: JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : ysr@777: Thread() jprovino@4542: #if INCLUDE_ALL_GCS ysr@777: , _satb_mark_queue(&_satb_mark_queue_set), ysr@777: _dirty_card_queue(&_dirty_card_queue_set) jprovino@4542: #endif // INCLUDE_ALL_GCS ysr@777: { duke@435: if (TraceThreadEvents) { duke@435: tty->print_cr("creating thread %p", this); duke@435: } duke@435: initialize(); dcubed@3202: _jni_attach_state = _not_attaching_via_jni; duke@435: set_entry_point(entry_point); duke@435: // Create the native thread itself. duke@435: // %note runtime_23 duke@435: os::ThreadType thr_type = os::java_thread; duke@435: thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : duke@435: os::java_thread; duke@435: os::create_thread(this, thr_type, stack_sz); zgu@3900: _safepoint_visible = false; duke@435: // The _osthread may be NULL here because we ran out of memory (too many threads active). duke@435: // We need to throw and OutOfMemoryError - however we cannot do this here because the caller duke@435: // may hold a lock and all locks must be unlocked before throwing the exception (throwing duke@435: // the exception consists of creating the exception object & initializing it, initialization duke@435: // will leave the VM via a JavaCall and then all locks must be unlocked). duke@435: // duke@435: // The thread is still suspended when we reach here. Thread must be explicit started duke@435: // by creator! Furthermore, the thread must also explicitly be added to the Threads list duke@435: // by calling Threads:add. The reason why this is not done here, is because the thread duke@435: // object must be fully initialized (take a look at JVM_Start) duke@435: } duke@435: duke@435: JavaThread::~JavaThread() { duke@435: if (TraceThreadEvents) { duke@435: tty->print_cr("terminate thread %p", this); duke@435: } duke@435: zgu@4193: // By now, this thread should already be invisible to safepoint, zgu@4193: // and its per-thread recorder also collected. zgu@3900: assert(!is_safepoint_visible(), "wrong state"); zgu@4193: #if INCLUDE_NMT zgu@4193: assert(get_recorder() == NULL, "Already collected"); zgu@4193: #endif // INCLUDE_NMT zgu@3900: duke@435: // JSR166 -- return the parker to the free list duke@435: Parker::Release(_parker); duke@435: _parker = NULL ; duke@435: duke@435: // Free any remaining previous UnrollBlock duke@435: vframeArray* old_array = vframe_array_last(); duke@435: duke@435: if (old_array != NULL) { duke@435: Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); duke@435: old_array->set_unroll_block(NULL); duke@435: delete old_info; duke@435: delete old_array; duke@435: } duke@435: duke@435: GrowableArray* deferred = deferred_locals(); duke@435: if (deferred != NULL) { duke@435: // This can only happen if thread is destroyed before deoptimization occurs. duke@435: assert(deferred->length() != 0, "empty array!"); duke@435: do { duke@435: jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); duke@435: deferred->remove_at(0); duke@435: // individual jvmtiDeferredLocalVariableSet are CHeapObj's duke@435: delete dlv; duke@435: } while (deferred->length() != 0); duke@435: delete deferred; duke@435: } duke@435: duke@435: // All Java related clean up happens in exit duke@435: ThreadSafepointState::destroy(this); duke@435: if (_thread_profiler != NULL) delete _thread_profiler; duke@435: if (_thread_stat != NULL) delete _thread_stat; duke@435: } duke@435: duke@435: duke@435: // The first routine called by a new Java thread duke@435: void JavaThread::run() { duke@435: // initialize thread-local alloc buffer related fields duke@435: this->initialize_tlab(); duke@435: duke@435: // used to test validitity of stack trace backs duke@435: this->record_base_of_stack_pointer(); duke@435: duke@435: // Record real stack base and size. duke@435: this->record_stack_base_and_size(); duke@435: duke@435: // Initialize thread local storage; set before calling MutexLocker duke@435: this->initialize_thread_local_storage(); duke@435: duke@435: this->create_stack_guard_pages(); duke@435: bobv@2036: this->cache_global_variables(); bobv@2036: duke@435: // Thread is now sufficient initialized to be handled by the safepoint code as being duke@435: // in the VM. Change thread state from _thread_new to _thread_in_vm duke@435: ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); duke@435: duke@435: assert(JavaThread::current() == this, "sanity check"); duke@435: assert(!Thread::current()->owns_locks(), "sanity check"); duke@435: duke@435: DTRACE_THREAD_PROBE(start, this); duke@435: duke@435: // This operation might block. We call that after all safepoint checks for a new thread has duke@435: // been completed. duke@435: this->set_active_handles(JNIHandleBlock::allocate_block()); duke@435: duke@435: if (JvmtiExport::should_post_thread_life()) { duke@435: JvmtiExport::post_thread_start(this); duke@435: } duke@435: sla@5237: EventThreadStart event; sla@5237: if (event.should_commit()) { sla@5237: event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); sla@5237: event.commit(); sla@5237: } phh@3427: duke@435: // We call another function to do the rest so we are sure that the stack addresses used duke@435: // from there will be lower than the stack base just computed duke@435: thread_main_inner(); duke@435: duke@435: // Note, thread is no longer valid at this point! duke@435: } duke@435: duke@435: duke@435: void JavaThread::thread_main_inner() { duke@435: assert(JavaThread::current() == this, "sanity check"); duke@435: assert(this->threadObj() != NULL, "just checking"); duke@435: dholmes@2482: // Execute thread entry point unless this thread has a pending exception dholmes@2482: // or has been stopped before starting. duke@435: // Note: Due to JVM_StopThread we can have pending exceptions already! dholmes@2482: if (!this->has_pending_exception() && dholmes@2482: !java_lang_Thread::is_stillborn(this->threadObj())) { dcubed@3202: { dcubed@3202: ResourceMark rm(this); dcubed@3202: this->set_native_thread_name(this->get_thread_name()); dcubed@3202: } duke@435: HandleMark hm(this); duke@435: this->entry_point()(this, this); duke@435: } duke@435: duke@435: DTRACE_THREAD_PROBE(stop, this); duke@435: duke@435: this->exit(false); duke@435: delete this; duke@435: } duke@435: duke@435: duke@435: static void ensure_join(JavaThread* thread) { duke@435: // We do not need to grap the Threads_lock, since we are operating on ourself. duke@435: Handle threadObj(thread, thread->threadObj()); duke@435: assert(threadObj.not_null(), "java thread object must exist"); duke@435: ObjectLocker lock(threadObj, thread); duke@435: // Ignore pending exception (ThreadDeath), since we are exiting anyway duke@435: thread->clear_pending_exception(); duke@435: // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. duke@435: java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); dholmes@2482: // Clear the native thread instance - this makes isAlive return false and allows the join() dholmes@2482: // to complete once we've done the notify_all below duke@435: java_lang_Thread::set_thread(threadObj(), NULL); duke@435: lock.notify_all(thread); duke@435: // Ignore pending exception (ThreadDeath), since we are exiting anyway duke@435: thread->clear_pending_exception(); duke@435: } duke@435: iveresov@876: duke@435: // For any new cleanup additions, please check to see if they need to be applied to duke@435: // cleanup_failed_attach_current_thread as well. duke@435: void JavaThread::exit(bool destroy_vm, ExitType exit_type) { duke@435: assert(this == JavaThread::current(), "thread consistency check"); duke@435: duke@435: HandleMark hm(this); duke@435: Handle uncaught_exception(this, this->pending_exception()); duke@435: this->clear_pending_exception(); duke@435: Handle threadObj(this, this->threadObj()); duke@435: assert(threadObj.not_null(), "Java thread object should be created"); duke@435: duke@435: if (get_thread_profiler() != NULL) { duke@435: get_thread_profiler()->disengage(); duke@435: ResourceMark rm; duke@435: get_thread_profiler()->print(get_thread_name()); duke@435: } duke@435: duke@435: duke@435: // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place duke@435: { duke@435: EXCEPTION_MARK; duke@435: duke@435: CLEAR_PENDING_EXCEPTION; duke@435: } duke@435: // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This duke@435: // has to be fixed by a runtime query method duke@435: if (!destroy_vm || JDK_Version::is_jdk12x_version()) { duke@435: // JSR-166: change call from from ThreadGroup.uncaughtException to duke@435: // java.lang.Thread.dispatchUncaughtException duke@435: if (uncaught_exception.not_null()) { duke@435: Handle group(this, java_lang_Thread::threadGroup(threadObj())); duke@435: { duke@435: EXCEPTION_MARK; duke@435: // Check if the method Thread.dispatchUncaughtException() exists. If so duke@435: // call it. Otherwise we have an older library without the JSR-166 changes, duke@435: // so call ThreadGroup.uncaughtException() duke@435: KlassHandle recvrKlass(THREAD, threadObj->klass()); duke@435: CallInfo callinfo; never@1577: KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); duke@435: LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, coleenp@2497: vmSymbols::dispatchUncaughtException_name(), coleenp@2497: vmSymbols::throwable_void_signature(), duke@435: KlassHandle(), false, false, THREAD); duke@435: CLEAR_PENDING_EXCEPTION; duke@435: methodHandle method = callinfo.selected_method(); duke@435: if (method.not_null()) { duke@435: JavaValue result(T_VOID); duke@435: JavaCalls::call_virtual(&result, duke@435: threadObj, thread_klass, coleenp@2497: vmSymbols::dispatchUncaughtException_name(), coleenp@2497: vmSymbols::throwable_void_signature(), duke@435: uncaught_exception, duke@435: THREAD); duke@435: } else { never@1577: KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); duke@435: JavaValue result(T_VOID); duke@435: JavaCalls::call_virtual(&result, duke@435: group, thread_group, coleenp@2497: vmSymbols::uncaughtException_name(), coleenp@2497: vmSymbols::thread_throwable_void_signature(), duke@435: threadObj, // Arg 1 duke@435: uncaught_exception, // Arg 2 duke@435: THREAD); duke@435: } coleenp@2516: if (HAS_PENDING_EXCEPTION) { coleenp@2516: ResourceMark rm(this); coleenp@2516: jio_fprintf(defaultStream::error_stream(), coleenp@2516: "\nException: %s thrown from the UncaughtExceptionHandler" coleenp@2516: " in thread \"%s\"\n", hseigel@4278: pending_exception()->klass()->external_name(), coleenp@2516: get_thread_name()); coleenp@2516: CLEAR_PENDING_EXCEPTION; coleenp@2516: } duke@435: } duke@435: } duke@435: phh@3427: // Called before the java thread exit since we want to read info phh@3427: // from java_lang_Thread object sla@5237: EventThreadEnd event; sla@5237: if (event.should_commit()) { sla@5237: event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); sla@5237: event.commit(); sla@5237: } phh@3427: phh@3427: // Call after last event on thread phh@3427: EVENT_THREAD_EXIT(this); phh@3427: duke@435: // Call Thread.exit(). We try 3 times in case we got another Thread.stop during duke@435: // the execution of the method. If that is not enough, then we don't really care. Thread.stop duke@435: // is deprecated anyhow. duke@435: { int count = 3; duke@435: while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { duke@435: EXCEPTION_MARK; duke@435: JavaValue result(T_VOID); never@1577: KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); duke@435: JavaCalls::call_virtual(&result, duke@435: threadObj, thread_klass, coleenp@2497: vmSymbols::exit_method_name(), coleenp@2497: vmSymbols::void_method_signature(), duke@435: THREAD); duke@435: CLEAR_PENDING_EXCEPTION; duke@435: } duke@435: } duke@435: duke@435: // notify JVMTI duke@435: if (JvmtiExport::should_post_thread_life()) { duke@435: JvmtiExport::post_thread_end(this); duke@435: } duke@435: duke@435: // We have notified the agents that we are exiting, before we go on, duke@435: // we must check for a pending external suspend request and honor it duke@435: // in order to not surprise the thread that made the suspend request. duke@435: while (true) { duke@435: { duke@435: MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); duke@435: if (!is_external_suspend()) { duke@435: set_terminated(_thread_exiting); duke@435: ThreadService::current_thread_exiting(this); duke@435: break; duke@435: } duke@435: // Implied else: duke@435: // Things get a little tricky here. We have a pending external duke@435: // suspend request, but we are holding the SR_lock so we duke@435: // can't just self-suspend. So we temporarily drop the lock duke@435: // and then self-suspend. duke@435: } duke@435: duke@435: ThreadBlockInVM tbivm(this); duke@435: java_suspend_self(); duke@435: duke@435: // We're done with this suspend request, but we have to loop around duke@435: // and check again. Eventually we will get SR_lock without a pending duke@435: // external suspend request and will be able to mark ourselves as duke@435: // exiting. duke@435: } duke@435: // no more external suspends are allowed at this point duke@435: } else { duke@435: // before_exit() has already posted JVMTI THREAD_END events duke@435: } duke@435: duke@435: // Notify waiters on thread object. This has to be done after exit() is called duke@435: // on the thread (if the thread is the last thread in a daemon ThreadGroup the duke@435: // group should have the destroyed bit set before waiters are notified). duke@435: ensure_join(this); duke@435: assert(!this->has_pending_exception(), "ensure_join should have cleared"); duke@435: duke@435: // 6282335 JNI DetachCurrentThread spec states that all Java monitors duke@435: // held by this thread must be released. A detach operation must only duke@435: // get here if there are no Java frames on the stack. Therefore, any duke@435: // owned monitors at this point MUST be JNI-acquired monitors which are duke@435: // pre-inflated and in the monitor cache. duke@435: // duke@435: // ensure_join() ignores IllegalThreadStateExceptions, and so does this. duke@435: if (exit_type == jni_detach && JNIDetachReleasesMonitors) { duke@435: assert(!this->has_last_Java_frame(), "detaching with Java frames?"); duke@435: ObjectSynchronizer::release_monitors_owned_by_thread(this); duke@435: assert(!this->has_pending_exception(), "release_monitors should have cleared"); duke@435: } duke@435: duke@435: // These things needs to be done while we are still a Java Thread. Make sure that thread duke@435: // is in a consistent state, in case GC happens duke@435: assert(_privileged_stack_top == NULL, "must be NULL when we get here"); duke@435: duke@435: if (active_handles() != NULL) { duke@435: JNIHandleBlock* block = active_handles(); duke@435: set_active_handles(NULL); duke@435: JNIHandleBlock::release_block(block); duke@435: } duke@435: duke@435: if (free_handle_block() != NULL) { duke@435: JNIHandleBlock* block = free_handle_block(); duke@435: set_free_handle_block(NULL); duke@435: JNIHandleBlock::release_block(block); duke@435: } duke@435: duke@435: // These have to be removed while this is still a valid thread. duke@435: remove_stack_guard_pages(); duke@435: duke@435: if (UseTLAB) { duke@435: tlab().make_parsable(true); // retire TLAB duke@435: } duke@435: kamg@2446: if (JvmtiEnv::environments_might_exist()) { dcubed@484: JvmtiExport::cleanup_thread(this); dcubed@484: } dcubed@484: johnc@4552: // We must flush any deferred card marks before removing a thread from johnc@4552: // the list of active threads. johnc@4552: Universe::heap()->flush_deferred_store_barrier(this); johnc@4552: assert(deferred_card_mark().is_empty(), "Should have been flushed"); johnc@4552: jprovino@4542: #if INCLUDE_ALL_GCS johnc@4552: // We must flush the G1-related buffers before removing a thread johnc@4552: // from the list of active threads. We must do this after any deferred johnc@4552: // card marks have been flushed (above) so that any entries that are johnc@4552: // added to the thread's dirty card queue as a result are not lost. iveresov@876: if (UseG1GC) { iveresov@876: flush_barrier_queues(); iveresov@876: } jprovino@4542: #endif // INCLUDE_ALL_GCS iveresov@876: duke@435: // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread duke@435: Threads::remove(this); duke@435: } duke@435: jprovino@4542: #if INCLUDE_ALL_GCS iveresov@876: // Flush G1-related queues. iveresov@876: void JavaThread::flush_barrier_queues() { iveresov@876: satb_mark_queue().flush(); iveresov@876: dirty_card_queue().flush(); iveresov@876: } tonyp@2197: tonyp@2197: void JavaThread::initialize_queues() { tonyp@2197: assert(!SafepointSynchronize::is_at_safepoint(), tonyp@2197: "we should not be at a safepoint"); tonyp@2197: tonyp@2197: ObjPtrQueue& satb_queue = satb_mark_queue(); tonyp@2197: SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); tonyp@2197: // The SATB queue should have been constructed with its active tonyp@2197: // field set to false. tonyp@2197: assert(!satb_queue.is_active(), "SATB queue should not be active"); tonyp@2197: assert(satb_queue.is_empty(), "SATB queue should be empty"); tonyp@2197: // If we are creating the thread during a marking cycle, we should tonyp@2197: // set the active field of the SATB queue to true. tonyp@2197: if (satb_queue_set.is_active()) { tonyp@2197: satb_queue.set_active(true); tonyp@2197: } tonyp@2197: tonyp@2197: DirtyCardQueue& dirty_queue = dirty_card_queue(); tonyp@2197: // The dirty card queue should have been constructed with its tonyp@2197: // active field set to true. tonyp@2197: assert(dirty_queue.is_active(), "dirty card queue should be active"); tonyp@2197: } jprovino@4542: #endif // INCLUDE_ALL_GCS iveresov@876: duke@435: void JavaThread::cleanup_failed_attach_current_thread() { iveresov@876: if (get_thread_profiler() != NULL) { iveresov@876: get_thread_profiler()->disengage(); iveresov@876: ResourceMark rm; iveresov@876: get_thread_profiler()->print(get_thread_name()); iveresov@876: } iveresov@876: iveresov@876: if (active_handles() != NULL) { iveresov@876: JNIHandleBlock* block = active_handles(); iveresov@876: set_active_handles(NULL); iveresov@876: JNIHandleBlock::release_block(block); iveresov@876: } iveresov@876: iveresov@876: if (free_handle_block() != NULL) { iveresov@876: JNIHandleBlock* block = free_handle_block(); iveresov@876: set_free_handle_block(NULL); iveresov@876: JNIHandleBlock::release_block(block); iveresov@876: } iveresov@876: coleenp@1725: // These have to be removed while this is still a valid thread. coleenp@1725: remove_stack_guard_pages(); coleenp@1725: iveresov@876: if (UseTLAB) { iveresov@876: tlab().make_parsable(true); // retire TLAB, if any iveresov@876: } iveresov@876: jprovino@4542: #if INCLUDE_ALL_GCS iveresov@876: if (UseG1GC) { iveresov@876: flush_barrier_queues(); iveresov@876: } jprovino@4542: #endif // INCLUDE_ALL_GCS iveresov@876: iveresov@876: Threads::remove(this); iveresov@876: delete this; duke@435: } duke@435: duke@435: iveresov@876: iveresov@876: duke@435: JavaThread* JavaThread::active() { duke@435: Thread* thread = ThreadLocalStorage::thread(); duke@435: assert(thread != NULL, "just checking"); duke@435: if (thread->is_Java_thread()) { duke@435: return (JavaThread*) thread; duke@435: } else { duke@435: assert(thread->is_VM_thread(), "this must be a vm thread"); duke@435: VM_Operation* op = ((VMThread*) thread)->vm_operation(); duke@435: JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); duke@435: assert(ret->is_Java_thread(), "must be a Java thread"); duke@435: return ret; duke@435: } duke@435: } duke@435: duke@435: bool JavaThread::is_lock_owned(address adr) const { xlu@1137: if (Thread::is_lock_owned(adr)) return true; duke@435: duke@435: for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { duke@435: if (chunk->contains(adr)) return true; duke@435: } duke@435: duke@435: return false; duke@435: } duke@435: duke@435: duke@435: void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { duke@435: chunk->set_next(monitor_chunks()); duke@435: set_monitor_chunks(chunk); duke@435: } duke@435: duke@435: void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { duke@435: guarantee(monitor_chunks() != NULL, "must be non empty"); duke@435: if (monitor_chunks() == chunk) { duke@435: set_monitor_chunks(chunk->next()); duke@435: } else { duke@435: MonitorChunk* prev = monitor_chunks(); duke@435: while (prev->next() != chunk) prev = prev->next(); duke@435: prev->set_next(chunk->next()); duke@435: } duke@435: } duke@435: duke@435: // JVM support. duke@435: duke@435: // Note: this function shouldn't block if it's called in duke@435: // _thread_in_native_trans state (such as from duke@435: // check_special_condition_for_native_trans()). duke@435: void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { duke@435: duke@435: if (has_last_Java_frame() && has_async_condition()) { duke@435: // If we are at a polling page safepoint (not a poll return) duke@435: // then we must defer async exception because live registers duke@435: // will be clobbered by the exception path. Poll return is duke@435: // ok because the call we a returning from already collides duke@435: // with exception handling registers and so there is no issue. duke@435: // (The exception handling path kills call result registers but duke@435: // this is ok since the exception kills the result anyway). duke@435: duke@435: if (is_at_poll_safepoint()) { duke@435: // if the code we are returning to has deoptimized we must defer duke@435: // the exception otherwise live registers get clobbered on the duke@435: // exception path before deoptimization is able to retrieve them. duke@435: // duke@435: RegisterMap map(this, false); duke@435: frame caller_fr = last_frame().sender(&map); duke@435: assert(caller_fr.is_compiled_frame(), "what?"); duke@435: if (caller_fr.is_deoptimized_frame()) { duke@435: if (TraceExceptions) { duke@435: ResourceMark rm; duke@435: tty->print_cr("deferred async exception at compiled safepoint"); duke@435: } duke@435: return; duke@435: } duke@435: } duke@435: } duke@435: duke@435: JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); duke@435: if (condition == _no_async_condition) { duke@435: // Conditions have changed since has_special_runtime_exit_condition() duke@435: // was called: duke@435: // - if we were here only because of an external suspend request, duke@435: // then that was taken care of above (or cancelled) so we are done duke@435: // - if we were here because of another async request, then it has duke@435: // been cleared between the has_special_runtime_exit_condition() duke@435: // and now so again we are done duke@435: return; duke@435: } duke@435: duke@435: // Check for pending async. exception duke@435: if (_pending_async_exception != NULL) { duke@435: // Only overwrite an already pending exception, if it is not a threadDeath. never@1577: if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { duke@435: duke@435: // We cannot call Exceptions::_throw(...) here because we cannot block duke@435: set_pending_exception(_pending_async_exception, __FILE__, __LINE__); duke@435: duke@435: if (TraceExceptions) { duke@435: ResourceMark rm; duke@435: tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); duke@435: if (has_last_Java_frame() ) { duke@435: frame f = last_frame(); duke@435: tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); duke@435: } coleenp@4037: tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); duke@435: } duke@435: _pending_async_exception = NULL; duke@435: clear_has_async_exception(); duke@435: } duke@435: } duke@435: duke@435: if (check_unsafe_error && duke@435: condition == _async_unsafe_access_error && !has_pending_exception()) { duke@435: condition = _no_async_condition; // done duke@435: switch (thread_state()) { duke@435: case _thread_in_vm: duke@435: { duke@435: JavaThread* THREAD = this; duke@435: THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); duke@435: } duke@435: case _thread_in_native: duke@435: { duke@435: ThreadInVMfromNative tiv(this); duke@435: JavaThread* THREAD = this; duke@435: THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); duke@435: } duke@435: case _thread_in_Java: duke@435: { duke@435: ThreadInVMfromJava tiv(this); duke@435: JavaThread* THREAD = this; duke@435: THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); duke@435: } duke@435: default: duke@435: ShouldNotReachHere(); duke@435: } duke@435: } duke@435: duke@435: assert(condition == _no_async_condition || has_pending_exception() || duke@435: (!check_unsafe_error && condition == _async_unsafe_access_error), duke@435: "must have handled the async condition, if no exception"); duke@435: } duke@435: duke@435: void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { duke@435: // duke@435: // Check for pending external suspend. Internal suspend requests do duke@435: // not use handle_special_runtime_exit_condition(). duke@435: // If JNIEnv proxies are allowed, don't self-suspend if the target duke@435: // thread is not the current thread. In older versions of jdbx, jdbx duke@435: // threads could call into the VM with another thread's JNIEnv so we duke@435: // can be here operating on behalf of a suspended thread (4432884). duke@435: bool do_self_suspend = is_external_suspend_with_lock(); duke@435: if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { duke@435: // duke@435: // Because thread is external suspended the safepoint code will count duke@435: // thread as at a safepoint. This can be odd because we can be here duke@435: // as _thread_in_Java which would normally transition to _thread_blocked duke@435: // at a safepoint. We would like to mark the thread as _thread_blocked duke@435: // before calling java_suspend_self like all other callers of it but duke@435: // we must then observe proper safepoint protocol. (We can't leave duke@435: // _thread_blocked with a safepoint in progress). However we can be duke@435: // here as _thread_in_native_trans so we can't use a normal transition duke@435: // constructor/destructor pair because they assert on that type of duke@435: // transition. We could do something like: duke@435: // duke@435: // JavaThreadState state = thread_state(); duke@435: // set_thread_state(_thread_in_vm); duke@435: // { duke@435: // ThreadBlockInVM tbivm(this); duke@435: // java_suspend_self() duke@435: // } duke@435: // set_thread_state(_thread_in_vm_trans); duke@435: // if (safepoint) block; duke@435: // set_thread_state(state); duke@435: // duke@435: // but that is pretty messy. Instead we just go with the way the duke@435: // code has worked before and note that this is the only path to duke@435: // java_suspend_self that doesn't put the thread in _thread_blocked duke@435: // mode. duke@435: duke@435: frame_anchor()->make_walkable(this); duke@435: java_suspend_self(); duke@435: duke@435: // We might be here for reasons in addition to the self-suspend request duke@435: // so check for other async requests. duke@435: } duke@435: duke@435: if (check_asyncs) { duke@435: check_and_handle_async_exceptions(); duke@435: } duke@435: } duke@435: duke@435: void JavaThread::send_thread_stop(oop java_throwable) { duke@435: assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); duke@435: assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); duke@435: assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); duke@435: duke@435: // Do not throw asynchronous exceptions against the compiler thread duke@435: // (the compiler thread should not be a Java thread -- fix in 1.4.2) duke@435: if (is_Compiler_thread()) return; duke@435: duke@435: { duke@435: // Actually throw the Throwable against the target Thread - however duke@435: // only if there is no thread death exception installed already. never@1577: if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { duke@435: // If the topmost frame is a runtime stub, then we are calling into duke@435: // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) duke@435: // must deoptimize the caller before continuing, as the compiled exception handler table duke@435: // may not be valid duke@435: if (has_last_Java_frame()) { duke@435: frame f = last_frame(); duke@435: if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { duke@435: // BiasedLocking needs an updated RegisterMap for the revoke monitors pass duke@435: RegisterMap reg_map(this, UseBiasedLocking); duke@435: frame compiled_frame = f.sender(®_map); kvn@4364: if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { duke@435: Deoptimization::deoptimize(this, compiled_frame, ®_map); duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Set async. pending exception in thread. duke@435: set_pending_async_exception(java_throwable); duke@435: duke@435: if (TraceExceptions) { duke@435: ResourceMark rm; coleenp@4037: tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); duke@435: } duke@435: // for AbortVMOnException flag coleenp@4037: NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); duke@435: } duke@435: } duke@435: duke@435: duke@435: // Interrupt thread so it will wake up from a potential wait() duke@435: Thread::interrupt(this); duke@435: } duke@435: duke@435: // External suspension mechanism. duke@435: // duke@435: // Tell the VM to suspend a thread when ever it knows that it does not hold on duke@435: // to any VM_locks and it is at a transition duke@435: // Self-suspension will happen on the transition out of the vm. duke@435: // Catch "this" coming in from JNIEnv pointers when the thread has been freed duke@435: // duke@435: // Guarantees on return: duke@435: // + Target thread will not execute any new bytecode (that's why we need to duke@435: // force a safepoint) duke@435: // + Target thread will not enter any new monitors duke@435: // duke@435: void JavaThread::java_suspend() { duke@435: { MutexLocker mu(Threads_lock); duke@435: if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { duke@435: return; duke@435: } duke@435: } duke@435: duke@435: { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); duke@435: if (!is_external_suspend()) { duke@435: // a racing resume has cancelled us; bail out now duke@435: return; duke@435: } duke@435: duke@435: // suspend is done duke@435: uint32_t debug_bits = 0; duke@435: // Warning: is_ext_suspend_completed() may temporarily drop the duke@435: // SR_lock to allow the thread to reach a stable thread state if duke@435: // it is currently in a transient thread state. duke@435: if (is_ext_suspend_completed(false /* !called_by_wait */, duke@435: SuspendRetryDelay, &debug_bits) ) { duke@435: return; duke@435: } duke@435: } duke@435: duke@435: VM_ForceSafepoint vm_suspend; duke@435: VMThread::execute(&vm_suspend); duke@435: } duke@435: duke@435: // Part II of external suspension. duke@435: // A JavaThread self suspends when it detects a pending external suspend duke@435: // request. This is usually on transitions. It is also done in places duke@435: // where continuing to the next transition would surprise the caller, duke@435: // e.g., monitor entry. duke@435: // duke@435: // Returns the number of times that the thread self-suspended. duke@435: // duke@435: // Note: DO NOT call java_suspend_self() when you just want to block current duke@435: // thread. java_suspend_self() is the second stage of cooperative duke@435: // suspension for external suspend requests and should only be used duke@435: // to complete an external suspend request. duke@435: // duke@435: int JavaThread::java_suspend_self() { duke@435: int ret = 0; duke@435: duke@435: // we are in the process of exiting so don't suspend duke@435: if (is_exiting()) { duke@435: clear_external_suspend(); duke@435: return ret; duke@435: } duke@435: duke@435: assert(_anchor.walkable() || duke@435: (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), duke@435: "must have walkable stack"); duke@435: duke@435: MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); duke@435: dcubed@1414: assert(!this->is_ext_suspended(), duke@435: "a thread trying to self-suspend should not already be suspended"); duke@435: duke@435: if (this->is_suspend_equivalent()) { duke@435: // If we are self-suspending as a result of the lifting of a duke@435: // suspend equivalent condition, then the suspend_equivalent duke@435: // flag is not cleared until we set the ext_suspended flag so duke@435: // that wait_for_ext_suspend_completion() returns consistent duke@435: // results. duke@435: this->clear_suspend_equivalent(); duke@435: } duke@435: duke@435: // A racing resume may have cancelled us before we grabbed SR_lock duke@435: // above. Or another external suspend request could be waiting for us duke@435: // by the time we return from SR_lock()->wait(). The thread duke@435: // that requested the suspension may already be trying to walk our duke@435: // stack and if we return now, we can change the stack out from under duke@435: // it. This would be a "bad thing (TM)" and cause the stack walker duke@435: // to crash. We stay self-suspended until there are no more pending duke@435: // external suspend requests. duke@435: while (is_external_suspend()) { duke@435: ret++; duke@435: this->set_ext_suspended(); duke@435: duke@435: // _ext_suspended flag is cleared by java_resume() duke@435: while (is_ext_suspended()) { duke@435: this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); duke@435: } duke@435: } duke@435: duke@435: return ret; duke@435: } duke@435: duke@435: #ifdef ASSERT duke@435: // verify the JavaThread has not yet been published in the Threads::list, and duke@435: // hence doesn't need protection from concurrent access at this stage duke@435: void JavaThread::verify_not_published() { duke@435: if (!Threads_lock->owned_by_self()) { duke@435: MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); duke@435: assert( !Threads::includes(this), duke@435: "java thread shouldn't have been published yet!"); duke@435: } duke@435: else { duke@435: assert( !Threads::includes(this), duke@435: "java thread shouldn't have been published yet!"); duke@435: } duke@435: } duke@435: #endif duke@435: duke@435: // Slow path when the native==>VM/Java barriers detect a safepoint is in duke@435: // progress or when _suspend_flags is non-zero. duke@435: // Current thread needs to self-suspend if there is a suspend request and/or duke@435: // block if a safepoint is in progress. duke@435: // Async exception ISN'T checked. duke@435: // Note only the ThreadInVMfromNative transition can call this function duke@435: // directly and when thread state is _thread_in_native_trans duke@435: void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { duke@435: assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); duke@435: duke@435: JavaThread *curJT = JavaThread::current(); duke@435: bool do_self_suspend = thread->is_external_suspend(); duke@435: duke@435: assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); duke@435: duke@435: // If JNIEnv proxies are allowed, don't self-suspend if the target duke@435: // thread is not the current thread. In older versions of jdbx, jdbx duke@435: // threads could call into the VM with another thread's JNIEnv so we duke@435: // can be here operating on behalf of a suspended thread (4432884). duke@435: if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { duke@435: JavaThreadState state = thread->thread_state(); duke@435: duke@435: // We mark this thread_blocked state as a suspend-equivalent so duke@435: // that a caller to is_ext_suspend_completed() won't be confused. duke@435: // The suspend-equivalent state is cleared by java_suspend_self(). duke@435: thread->set_suspend_equivalent(); duke@435: duke@435: // If the safepoint code sees the _thread_in_native_trans state, it will duke@435: // wait until the thread changes to other thread state. There is no duke@435: // guarantee on how soon we can obtain the SR_lock and complete the duke@435: // self-suspend request. It would be a bad idea to let safepoint wait for duke@435: // too long. Temporarily change the state to _thread_blocked to duke@435: // let the VM thread know that this thread is ready for GC. The problem duke@435: // of changing thread state is that safepoint could happen just after duke@435: // java_suspend_self() returns after being resumed, and VM thread will duke@435: // see the _thread_blocked state. We must check for safepoint duke@435: // after restoring the state and make sure we won't leave while a safepoint duke@435: // is in progress. duke@435: thread->set_thread_state(_thread_blocked); duke@435: thread->java_suspend_self(); duke@435: thread->set_thread_state(state); duke@435: // Make sure new state is seen by VM thread duke@435: if (os::is_MP()) { duke@435: if (UseMembar) { duke@435: // Force a fence between the write above and read below duke@435: OrderAccess::fence(); duke@435: } else { duke@435: // Must use this rather than serialization page in particular on Windows duke@435: InterfaceSupport::serialize_memory(thread); duke@435: } duke@435: } duke@435: } duke@435: duke@435: if (SafepointSynchronize::do_call_back()) { duke@435: // If we are safepointing, then block the caller which may not be duke@435: // the same as the target thread (see above). duke@435: SafepointSynchronize::block(curJT); duke@435: } duke@435: duke@435: if (thread->is_deopt_suspend()) { duke@435: thread->clear_deopt_suspend(); duke@435: RegisterMap map(thread, false); duke@435: frame f = thread->last_frame(); duke@435: while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { duke@435: f = f.sender(&map); duke@435: } duke@435: if (f.id() == thread->must_deopt_id()) { duke@435: thread->clear_must_deopt_id(); never@2082: f.deoptimize(thread); duke@435: } else { duke@435: fatal("missed deoptimization!"); duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Slow path when the native==>VM/Java barriers detect a safepoint is in duke@435: // progress or when _suspend_flags is non-zero. duke@435: // Current thread needs to self-suspend if there is a suspend request and/or duke@435: // block if a safepoint is in progress. duke@435: // Also check for pending async exception (not including unsafe access error). duke@435: // Note only the native==>VM/Java barriers can call this function and when duke@435: // thread state is _thread_in_native_trans. duke@435: void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { duke@435: check_safepoint_and_suspend_for_native_trans(thread); duke@435: duke@435: if (thread->has_async_exception()) { duke@435: // We are in _thread_in_native_trans state, don't handle unsafe duke@435: // access error since that may block. duke@435: thread->check_and_handle_async_exceptions(false); duke@435: } duke@435: } duke@435: never@3500: // This is a variant of the normal never@3500: // check_special_condition_for_native_trans with slightly different never@3500: // semantics for use by critical native wrappers. It does all the never@3500: // normal checks but also performs the transition back into never@3500: // thread_in_Java state. This is required so that critical natives never@3500: // can potentially block and perform a GC if they are the last thread never@3500: // exiting the GC_locker. never@3500: void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { never@3500: check_special_condition_for_native_trans(thread); never@3500: never@3500: // Finish the transition never@3500: thread->set_thread_state(_thread_in_Java); never@3500: never@3500: if (thread->do_critical_native_unlock()) { never@3500: ThreadInVMfromJavaNoAsyncException tiv(thread); never@3500: GC_locker::unlock_critical(thread); never@3500: thread->clear_critical_native_unlock(); never@3500: } never@3500: } never@3500: duke@435: // We need to guarantee the Threads_lock here, since resumes are not duke@435: // allowed during safepoint synchronization duke@435: // Can only resume from an external suspension duke@435: void JavaThread::java_resume() { duke@435: assert_locked_or_safepoint(Threads_lock); duke@435: duke@435: // Sanity check: thread is gone, has started exiting or the thread duke@435: // was not externally suspended. duke@435: if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { duke@435: return; duke@435: } duke@435: duke@435: MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); duke@435: duke@435: clear_external_suspend(); duke@435: duke@435: if (is_ext_suspended()) { duke@435: clear_ext_suspended(); duke@435: SR_lock()->notify_all(); duke@435: } duke@435: } duke@435: duke@435: void JavaThread::create_stack_guard_pages() { duke@435: if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; duke@435: address low_addr = stack_base() - stack_size(); duke@435: size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); duke@435: duke@435: int allocate = os::allocate_stack_guard_pages(); duke@435: // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); duke@435: coleenp@1755: if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { duke@435: warning("Attempt to allocate stack guard pages failed."); duke@435: return; duke@435: } duke@435: duke@435: if (os::guard_memory((char *) low_addr, len)) { duke@435: _stack_guard_state = stack_guard_enabled; duke@435: } else { duke@435: warning("Attempt to protect stack guard pages failed."); duke@435: if (os::uncommit_memory((char *) low_addr, len)) { duke@435: warning("Attempt to deallocate stack guard pages failed."); duke@435: } duke@435: } duke@435: } duke@435: duke@435: void JavaThread::remove_stack_guard_pages() { zgu@4193: assert(Thread::current() == this, "from different thread"); duke@435: if (_stack_guard_state == stack_guard_unused) return; duke@435: address low_addr = stack_base() - stack_size(); duke@435: size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); duke@435: duke@435: if (os::allocate_stack_guard_pages()) { coleenp@1755: if (os::remove_stack_guard_pages((char *) low_addr, len)) { duke@435: _stack_guard_state = stack_guard_unused; duke@435: } else { duke@435: warning("Attempt to deallocate stack guard pages failed."); duke@435: } duke@435: } else { duke@435: if (_stack_guard_state == stack_guard_unused) return; duke@435: if (os::unguard_memory((char *) low_addr, len)) { duke@435: _stack_guard_state = stack_guard_unused; duke@435: } else { duke@435: warning("Attempt to unprotect stack guard pages failed."); duke@435: } duke@435: } duke@435: } duke@435: duke@435: void JavaThread::enable_stack_yellow_zone() { duke@435: assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); duke@435: assert(_stack_guard_state != stack_guard_enabled, "already enabled"); duke@435: duke@435: // The base notation is from the stacks point of view, growing downward. duke@435: // We need to adjust it to work correctly with guard_memory() duke@435: address base = stack_yellow_zone_base() - stack_yellow_zone_size(); duke@435: duke@435: guarantee(base < stack_base(),"Error calculating stack yellow zone"); duke@435: guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); duke@435: duke@435: if (os::guard_memory((char *) base, stack_yellow_zone_size())) { duke@435: _stack_guard_state = stack_guard_enabled; duke@435: } else { duke@435: warning("Attempt to guard stack yellow zone failed."); duke@435: } duke@435: enable_register_stack_guard(); duke@435: } duke@435: duke@435: void JavaThread::disable_stack_yellow_zone() { duke@435: assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); duke@435: assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); duke@435: duke@435: // Simply return if called for a thread that does not use guard pages. duke@435: if (_stack_guard_state == stack_guard_unused) return; duke@435: duke@435: // The base notation is from the stacks point of view, growing downward. duke@435: // We need to adjust it to work correctly with guard_memory() duke@435: address base = stack_yellow_zone_base() - stack_yellow_zone_size(); duke@435: duke@435: if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { duke@435: _stack_guard_state = stack_guard_yellow_disabled; duke@435: } else { duke@435: warning("Attempt to unguard stack yellow zone failed."); duke@435: } duke@435: disable_register_stack_guard(); duke@435: } duke@435: duke@435: void JavaThread::enable_stack_red_zone() { duke@435: // The base notation is from the stacks point of view, growing downward. duke@435: // We need to adjust it to work correctly with guard_memory() duke@435: assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); duke@435: address base = stack_red_zone_base() - stack_red_zone_size(); duke@435: duke@435: guarantee(base < stack_base(),"Error calculating stack red zone"); duke@435: guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); duke@435: duke@435: if(!os::guard_memory((char *) base, stack_red_zone_size())) { duke@435: warning("Attempt to guard stack red zone failed."); duke@435: } duke@435: } duke@435: duke@435: void JavaThread::disable_stack_red_zone() { duke@435: // The base notation is from the stacks point of view, growing downward. duke@435: // We need to adjust it to work correctly with guard_memory() duke@435: assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); duke@435: address base = stack_red_zone_base() - stack_red_zone_size(); duke@435: if (!os::unguard_memory((char *)base, stack_red_zone_size())) { duke@435: warning("Attempt to unguard stack red zone failed."); duke@435: } duke@435: } duke@435: duke@435: void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { duke@435: // ignore is there is no stack duke@435: if (!has_last_Java_frame()) return; duke@435: // traverse the stack frames. Starts from top frame. duke@435: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { duke@435: frame* fr = fst.current(); duke@435: f(fr, fst.register_map()); duke@435: } duke@435: } duke@435: duke@435: duke@435: #ifndef PRODUCT duke@435: // Deoptimization duke@435: // Function for testing deoptimization duke@435: void JavaThread::deoptimize() { duke@435: // BiasedLocking needs an updated RegisterMap for the revoke monitors pass duke@435: StackFrameStream fst(this, UseBiasedLocking); duke@435: bool deopt = false; // Dump stack only if a deopt actually happens. duke@435: bool only_at = strlen(DeoptimizeOnlyAt) > 0; duke@435: // Iterate over all frames in the thread and deoptimize duke@435: for(; !fst.is_done(); fst.next()) { duke@435: if(fst.current()->can_be_deoptimized()) { duke@435: duke@435: if (only_at) { duke@435: // Deoptimize only at particular bcis. DeoptimizeOnlyAt duke@435: // consists of comma or carriage return separated numbers so duke@435: // search for the current bci in that string. duke@435: address pc = fst.current()->pc(); duke@435: nmethod* nm = (nmethod*) fst.current()->cb(); duke@435: ScopeDesc* sd = nm->scope_desc_at( pc); duke@435: char buffer[8]; duke@435: jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); duke@435: size_t len = strlen(buffer); duke@435: const char * found = strstr(DeoptimizeOnlyAt, buffer); duke@435: while (found != NULL) { duke@435: if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && duke@435: (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { duke@435: // Check that the bci found is bracketed by terminators. duke@435: break; duke@435: } duke@435: found = strstr(found + 1, buffer); duke@435: } duke@435: if (!found) { duke@435: continue; duke@435: } duke@435: } duke@435: duke@435: if (DebugDeoptimization && !deopt) { duke@435: deopt = true; // One-time only print before deopt duke@435: tty->print_cr("[BEFORE Deoptimization]"); duke@435: trace_frames(); duke@435: trace_stack(); duke@435: } duke@435: Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); duke@435: } duke@435: } duke@435: duke@435: if (DebugDeoptimization && deopt) { duke@435: tty->print_cr("[AFTER Deoptimization]"); duke@435: trace_frames(); duke@435: } duke@435: } duke@435: duke@435: duke@435: // Make zombies duke@435: void JavaThread::make_zombies() { duke@435: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { duke@435: if (fst.current()->can_be_deoptimized()) { duke@435: // it is a Java nmethod duke@435: nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); duke@435: nm->make_not_entrant(); duke@435: } duke@435: } duke@435: } duke@435: #endif // PRODUCT duke@435: duke@435: duke@435: void JavaThread::deoptimized_wrt_marked_nmethods() { duke@435: if (!has_last_Java_frame()) return; duke@435: // BiasedLocking needs an updated RegisterMap for the revoke monitors pass duke@435: StackFrameStream fst(this, UseBiasedLocking); duke@435: for(; !fst.is_done(); fst.next()) { duke@435: if (fst.current()->should_be_deoptimized()) { vlivanov@4154: if (LogCompilation && xtty != NULL) { vlivanov@4154: nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); vlivanov@4154: xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", vlivanov@4154: this->name(), nm != NULL ? nm->compile_id() : -1); vlivanov@4154: } vlivanov@4154: duke@435: Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); duke@435: } duke@435: } duke@435: } duke@435: duke@435: duke@435: // GC support duke@435: static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } duke@435: duke@435: void JavaThread::gc_epilogue() { duke@435: frames_do(frame_gc_epilogue); duke@435: } duke@435: duke@435: duke@435: static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } duke@435: duke@435: void JavaThread::gc_prologue() { duke@435: frames_do(frame_gc_prologue); duke@435: } duke@435: minqi@1554: // If the caller is a NamedThread, then remember, in the current scope, minqi@1554: // the given JavaThread in its _processed_thread field. minqi@1554: class RememberProcessedThread: public StackObj { minqi@1554: NamedThread* _cur_thr; minqi@1554: public: minqi@1554: RememberProcessedThread(JavaThread* jthr) { minqi@1554: Thread* thread = Thread::current(); minqi@1554: if (thread->is_Named_thread()) { minqi@1554: _cur_thr = (NamedThread *)thread; minqi@1554: _cur_thr->set_processed_thread(jthr); minqi@1554: } else { minqi@1554: _cur_thr = NULL; minqi@1554: } minqi@1554: } minqi@1554: minqi@1554: ~RememberProcessedThread() { minqi@1554: if (_cur_thr) { minqi@1554: _cur_thr->set_processed_thread(NULL); minqi@1554: } minqi@1554: } minqi@1554: }; duke@435: stefank@4298: void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { ysr@1601: // Verify that the deferred card marks have been flushed. ysr@1601: assert(deferred_card_mark().is_empty(), "Should be empty during GC"); ysr@1462: duke@435: // The ThreadProfiler oops_do is done from FlatProfiler::oops_do duke@435: // since there may be more than one thread using each ThreadProfiler. duke@435: duke@435: // Traverse the GCHandles stefank@4298: Thread::oops_do(f, cld_f, cf); duke@435: duke@435: assert( (!has_last_Java_frame() && java_call_counter() == 0) || duke@435: (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); duke@435: duke@435: if (has_last_Java_frame()) { minqi@1554: // Record JavaThread to GC thread minqi@1554: RememberProcessedThread rpt(this); duke@435: duke@435: // Traverse the privileged stack duke@435: if (_privileged_stack_top != NULL) { duke@435: _privileged_stack_top->oops_do(f); duke@435: } duke@435: duke@435: // traverse the registered growable array duke@435: if (_array_for_gc != NULL) { duke@435: for (int index = 0; index < _array_for_gc->length(); index++) { duke@435: f->do_oop(_array_for_gc->adr_at(index)); duke@435: } duke@435: } duke@435: duke@435: // Traverse the monitor chunks duke@435: for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { duke@435: chunk->oops_do(f); duke@435: } duke@435: duke@435: // Traverse the execution stack duke@435: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { stefank@4298: fst.current()->oops_do(f, cld_f, cf, fst.register_map()); duke@435: } duke@435: } duke@435: duke@435: // callee_target is never live across a gc point so NULL it here should duke@435: // it still contain a methdOop. duke@435: duke@435: set_callee_target(NULL); duke@435: duke@435: assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); duke@435: // If we have deferred set_locals there might be oops waiting to be duke@435: // written duke@435: GrowableArray* list = deferred_locals(); duke@435: if (list != NULL) { duke@435: for (int i = 0; i < list->length(); i++) { duke@435: list->at(i)->oops_do(f); duke@435: } duke@435: } duke@435: duke@435: // Traverse instance variables at the end since the GC may be moving things duke@435: // around using this function duke@435: f->do_oop((oop*) &_threadObj); duke@435: f->do_oop((oop*) &_vm_result); duke@435: f->do_oop((oop*) &_exception_oop); duke@435: f->do_oop((oop*) &_pending_async_exception); duke@435: duke@435: if (jvmti_thread_state() != NULL) { duke@435: jvmti_thread_state()->oops_do(f); duke@435: } duke@435: } duke@435: jrose@1424: void JavaThread::nmethods_do(CodeBlobClosure* cf) { jrose@1424: Thread::nmethods_do(cf); // (super method is a no-op) duke@435: duke@435: assert( (!has_last_Java_frame() && java_call_counter() == 0) || duke@435: (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); duke@435: duke@435: if (has_last_Java_frame()) { duke@435: // Traverse the execution stack duke@435: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { jrose@1424: fst.current()->nmethods_do(cf); duke@435: } duke@435: } duke@435: } duke@435: coleenp@4037: void JavaThread::metadata_do(void f(Metadata*)) { coleenp@4037: Thread::metadata_do(f); coleenp@4037: if (has_last_Java_frame()) { coleenp@4037: // Traverse the execution stack to call f() on the methods in the stack coleenp@4037: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { coleenp@4037: fst.current()->metadata_do(f); coleenp@4037: } coleenp@4037: } else if (is_Compiler_thread()) { coleenp@4037: // need to walk ciMetadata in current compile tasks to keep alive. coleenp@4037: CompilerThread* ct = (CompilerThread*)this; coleenp@4037: if (ct->env() != NULL) { coleenp@4037: ct->env()->metadata_do(f); coleenp@4037: } coleenp@4037: } coleenp@4037: } coleenp@4037: duke@435: // Printing duke@435: const char* _get_thread_state_name(JavaThreadState _thread_state) { duke@435: switch (_thread_state) { duke@435: case _thread_uninitialized: return "_thread_uninitialized"; duke@435: case _thread_new: return "_thread_new"; duke@435: case _thread_new_trans: return "_thread_new_trans"; duke@435: case _thread_in_native: return "_thread_in_native"; duke@435: case _thread_in_native_trans: return "_thread_in_native_trans"; duke@435: case _thread_in_vm: return "_thread_in_vm"; duke@435: case _thread_in_vm_trans: return "_thread_in_vm_trans"; duke@435: case _thread_in_Java: return "_thread_in_Java"; duke@435: case _thread_in_Java_trans: return "_thread_in_Java_trans"; duke@435: case _thread_blocked: return "_thread_blocked"; duke@435: case _thread_blocked_trans: return "_thread_blocked_trans"; duke@435: default: return "unknown thread state"; duke@435: } duke@435: } duke@435: duke@435: #ifndef PRODUCT duke@435: void JavaThread::print_thread_state_on(outputStream *st) const { duke@435: st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); duke@435: }; duke@435: void JavaThread::print_thread_state() const { duke@435: print_thread_state_on(tty); duke@435: }; duke@435: #endif // PRODUCT duke@435: duke@435: // Called by Threads::print() for VM_PrintThreads operation duke@435: void JavaThread::print_on(outputStream *st) const { duke@435: st->print("\"%s\" ", get_thread_name()); duke@435: oop thread_oop = threadObj(); dholmes@4077: if (thread_oop != NULL) { dholmes@4077: st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); dholmes@4077: if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); dholmes@4077: st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); dholmes@4077: } duke@435: Thread::print_on(st); duke@435: // print guess for valid stack memory region (assume 4K pages); helps lock debugging xlu@1137: st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); duke@435: if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { duke@435: st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); duke@435: } duke@435: #ifndef PRODUCT duke@435: print_thread_state_on(st); duke@435: _safepoint_state->print_on(st); duke@435: #endif // PRODUCT duke@435: } duke@435: duke@435: // Called by fatal error handler. The difference between this and duke@435: // JavaThread::print() is that we can't grab lock or allocate memory. duke@435: void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { duke@435: st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); duke@435: oop thread_obj = threadObj(); duke@435: if (thread_obj != NULL) { duke@435: if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); duke@435: } duke@435: st->print(" ["); duke@435: st->print("%s", _get_thread_state_name(_thread_state)); duke@435: if (osthread()) { duke@435: st->print(", id=%d", osthread()->thread_id()); duke@435: } duke@435: st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", duke@435: _stack_base - _stack_size, _stack_base); duke@435: st->print("]"); duke@435: return; duke@435: } duke@435: duke@435: // Verification duke@435: duke@435: static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } duke@435: duke@435: void JavaThread::verify() { duke@435: // Verify oops in the thread. stefank@4298: oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); duke@435: duke@435: // Verify the stack frames. duke@435: frames_do(frame_verify); duke@435: } duke@435: duke@435: // CR 6300358 (sub-CR 2137150) duke@435: // Most callers of this method assume that it can't return NULL but a duke@435: // thread may not have a name whilst it is in the process of attaching to duke@435: // the VM - see CR 6412693, and there are places where a JavaThread can be duke@435: // seen prior to having it's threadObj set (eg JNI attaching threads and duke@435: // if vm exit occurs during initialization). These cases can all be accounted duke@435: // for such that this method never returns NULL. duke@435: const char* JavaThread::get_thread_name() const { duke@435: #ifdef ASSERT duke@435: // early safepoints can hit while current thread does not yet have TLS duke@435: if (!SafepointSynchronize::is_at_safepoint()) { duke@435: Thread *cur = Thread::current(); duke@435: if (!(cur->is_Java_thread() && cur == this)) { duke@435: // Current JavaThreads are allowed to get their own name without duke@435: // the Threads_lock. duke@435: assert_locked_or_safepoint(Threads_lock); duke@435: } duke@435: } duke@435: #endif // ASSERT duke@435: return get_thread_name_string(); duke@435: } duke@435: duke@435: // Returns a non-NULL representation of this thread's name, or a suitable duke@435: // descriptive string if there is no set name duke@435: const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { duke@435: const char* name_str; duke@435: oop thread_obj = threadObj(); duke@435: if (thread_obj != NULL) { duke@435: typeArrayOop name = java_lang_Thread::name(thread_obj); duke@435: if (name != NULL) { duke@435: if (buf == NULL) { duke@435: name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); duke@435: } duke@435: else { duke@435: name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); duke@435: } duke@435: } dcubed@3202: else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 duke@435: name_str = ""; duke@435: } duke@435: else { duke@435: name_str = Thread::name(); duke@435: } duke@435: } duke@435: else { duke@435: name_str = Thread::name(); duke@435: } duke@435: assert(name_str != NULL, "unexpected NULL thread name"); duke@435: return name_str; duke@435: } duke@435: duke@435: duke@435: const char* JavaThread::get_threadgroup_name() const { duke@435: debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) duke@435: oop thread_obj = threadObj(); duke@435: if (thread_obj != NULL) { duke@435: oop thread_group = java_lang_Thread::threadGroup(thread_obj); duke@435: if (thread_group != NULL) { duke@435: typeArrayOop name = java_lang_ThreadGroup::name(thread_group); duke@435: // ThreadGroup.name can be null duke@435: if (name != NULL) { duke@435: const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); duke@435: return str; duke@435: } duke@435: } duke@435: } duke@435: return NULL; duke@435: } duke@435: duke@435: const char* JavaThread::get_parent_name() const { duke@435: debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) duke@435: oop thread_obj = threadObj(); duke@435: if (thread_obj != NULL) { duke@435: oop thread_group = java_lang_Thread::threadGroup(thread_obj); duke@435: if (thread_group != NULL) { duke@435: oop parent = java_lang_ThreadGroup::parent(thread_group); duke@435: if (parent != NULL) { duke@435: typeArrayOop name = java_lang_ThreadGroup::name(parent); duke@435: // ThreadGroup.name can be null duke@435: if (name != NULL) { duke@435: const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); duke@435: return str; duke@435: } duke@435: } duke@435: } duke@435: } duke@435: return NULL; duke@435: } duke@435: duke@435: ThreadPriority JavaThread::java_priority() const { duke@435: oop thr_oop = threadObj(); duke@435: if (thr_oop == NULL) return NormPriority; // Bootstrapping duke@435: ThreadPriority priority = java_lang_Thread::priority(thr_oop); duke@435: assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); duke@435: return priority; duke@435: } duke@435: duke@435: void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { duke@435: duke@435: assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); duke@435: // Link Java Thread object <-> C++ Thread duke@435: duke@435: // Get the C++ thread object (an oop) from the JNI handle (a jthread) duke@435: // and put it into a new Handle. The Handle "thread_oop" can then duke@435: // be used to pass the C++ thread object to other methods. duke@435: duke@435: // Set the Java level thread object (jthread) field of the duke@435: // new thread (a JavaThread *) to C++ thread object using the duke@435: // "thread_oop" handle. duke@435: duke@435: // Set the thread field (a JavaThread *) of the duke@435: // oop representing the java_lang_Thread to the new thread (a JavaThread *). duke@435: duke@435: Handle thread_oop(Thread::current(), duke@435: JNIHandles::resolve_non_null(jni_thread)); coleenp@4037: assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), duke@435: "must be initialized"); duke@435: set_threadObj(thread_oop()); duke@435: java_lang_Thread::set_thread(thread_oop(), this); duke@435: duke@435: if (prio == NoPriority) { duke@435: prio = java_lang_Thread::priority(thread_oop()); duke@435: assert(prio != NoPriority, "A valid priority should be present"); duke@435: } duke@435: duke@435: // Push the Java priority down to the native thread; needs Threads_lock duke@435: Thread::set_priority(this, prio); duke@435: duke@435: // Add the new thread to the Threads list and set it in motion. duke@435: // We must have threads lock in order to call Threads::add. duke@435: // It is crucial that we do not block before the thread is duke@435: // added to the Threads list for if a GC happens, then the java_thread oop duke@435: // will not be visited by GC. duke@435: Threads::add(this); duke@435: } duke@435: duke@435: oop JavaThread::current_park_blocker() { duke@435: // Support for JSR-166 locks duke@435: oop thread_oop = threadObj(); kamg@677: if (thread_oop != NULL && kamg@677: JDK_Version::current().supports_thread_park_blocker()) { duke@435: return java_lang_Thread::park_blocker(thread_oop); duke@435: } duke@435: return NULL; duke@435: } duke@435: duke@435: duke@435: void JavaThread::print_stack_on(outputStream* st) { duke@435: if (!has_last_Java_frame()) return; duke@435: ResourceMark rm; duke@435: HandleMark hm; duke@435: duke@435: RegisterMap reg_map(this); duke@435: vframe* start_vf = last_java_vframe(®_map); duke@435: int count = 0; duke@435: for (vframe* f = start_vf; f; f = f->sender() ) { duke@435: if (f->is_java_frame()) { duke@435: javaVFrame* jvf = javaVFrame::cast(f); duke@435: java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); duke@435: duke@435: // Print out lock information duke@435: if (JavaMonitorsInStackTrace) { duke@435: jvf->print_lock_info_on(st, count); duke@435: } duke@435: } else { duke@435: // Ignore non-Java frames duke@435: } duke@435: duke@435: // Bail-out case for too deep stacks duke@435: count++; duke@435: if (MaxJavaStackTraceDepth == count) return; duke@435: } duke@435: } duke@435: duke@435: duke@435: // JVMTI PopFrame support duke@435: void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { duke@435: assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); duke@435: if (in_bytes(size_in_bytes) != 0) { zgu@3900: _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); duke@435: _popframe_preserved_args_size = in_bytes(size_in_bytes); kvn@1958: Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); duke@435: } duke@435: } duke@435: duke@435: void* JavaThread::popframe_preserved_args() { duke@435: return _popframe_preserved_args; duke@435: } duke@435: duke@435: ByteSize JavaThread::popframe_preserved_args_size() { duke@435: return in_ByteSize(_popframe_preserved_args_size); duke@435: } duke@435: duke@435: WordSize JavaThread::popframe_preserved_args_size_in_words() { duke@435: int sz = in_bytes(popframe_preserved_args_size()); duke@435: assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); duke@435: return in_WordSize(sz / wordSize); duke@435: } duke@435: duke@435: void JavaThread::popframe_free_preserved_args() { duke@435: assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); zgu@3900: FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); duke@435: _popframe_preserved_args = NULL; duke@435: _popframe_preserved_args_size = 0; duke@435: } duke@435: duke@435: #ifndef PRODUCT duke@435: duke@435: void JavaThread::trace_frames() { duke@435: tty->print_cr("[Describe stack]"); duke@435: int frame_no = 1; duke@435: for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { duke@435: tty->print(" %d. ", frame_no++); duke@435: fst.current()->print_value_on(tty,this); duke@435: tty->cr(); duke@435: } duke@435: } duke@435: never@3108: class PrintAndVerifyOopClosure: public OopClosure { never@3108: protected: never@3108: template inline void do_oop_work(T* p) { never@3108: oop obj = oopDesc::load_decode_heap_oop(p); never@3108: if (obj == NULL) return; never@3108: tty->print(INTPTR_FORMAT ": ", p); never@3108: if (obj->is_oop_or_null()) { never@3108: if (obj->is_objArray()) { never@3108: tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); never@3108: } else { never@3108: obj->print(); never@3108: } never@3108: } else { never@3108: tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); never@3108: } never@3108: tty->cr(); never@3108: } never@3108: public: never@3108: virtual void do_oop(oop* p) { do_oop_work(p); } never@3108: virtual void do_oop(narrowOop* p) { do_oop_work(p); } never@3108: }; never@3108: never@3108: never@3108: static void oops_print(frame* f, const RegisterMap *map) { never@3108: PrintAndVerifyOopClosure print; never@3108: f->print_value(); stefank@4298: f->oops_do(&print, NULL, NULL, (RegisterMap*)map); never@3108: } never@3108: never@3108: // Print our all the locations that contain oops and whether they are never@3108: // valid or not. This useful when trying to find the oldest frame never@3108: // where an oop has gone bad since the frame walk is from youngest to never@3108: // oldest. never@3108: void JavaThread::trace_oops() { never@3108: tty->print_cr("[Trace oops]"); never@3108: frames_do(oops_print); never@3108: } never@3108: duke@435: never@2920: #ifdef ASSERT never@2868: // Print or validate the layout of stack frames never@2868: void JavaThread::print_frame_layout(int depth, bool validate_only) { never@2868: ResourceMark rm; never@2868: PRESERVE_EXCEPTION_MARK; never@2868: FrameValues values; never@2868: int frame_no = 0; never@2868: for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { never@2868: fst.current()->describe(values, ++frame_no); never@2868: if (depth == frame_no) break; never@2868: } never@2868: if (validate_only) { never@2868: values.validate(); never@2868: } else { never@2868: tty->print_cr("[Describe stack layout]"); twisti@3238: values.print(this); never@2868: } never@2868: } never@2920: #endif never@2868: duke@435: void JavaThread::trace_stack_from(vframe* start_vf) { duke@435: ResourceMark rm; duke@435: int vframe_no = 1; duke@435: for (vframe* f = start_vf; f; f = f->sender() ) { duke@435: if (f->is_java_frame()) { duke@435: javaVFrame::cast(f)->print_activation(vframe_no++); duke@435: } else { duke@435: f->print(); duke@435: } duke@435: if (vframe_no > StackPrintLimit) { duke@435: tty->print_cr("......"); duke@435: return; duke@435: } duke@435: } duke@435: } duke@435: duke@435: duke@435: void JavaThread::trace_stack() { duke@435: if (!has_last_Java_frame()) return; duke@435: ResourceMark rm; duke@435: HandleMark hm; duke@435: RegisterMap reg_map(this); duke@435: trace_stack_from(last_java_vframe(®_map)); duke@435: } duke@435: duke@435: duke@435: #endif // PRODUCT duke@435: duke@435: duke@435: javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { duke@435: assert(reg_map != NULL, "a map must be given"); duke@435: frame f = last_frame(); duke@435: for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { duke@435: if (vf->is_java_frame()) return javaVFrame::cast(vf); duke@435: } duke@435: return NULL; duke@435: } duke@435: duke@435: coleenp@4037: Klass* JavaThread::security_get_caller_class(int depth) { duke@435: vframeStream vfst(this); duke@435: vfst.security_get_caller_frame(depth); duke@435: if (!vfst.at_end()) { duke@435: return vfst.method()->method_holder(); duke@435: } duke@435: return NULL; duke@435: } duke@435: duke@435: static void compiler_thread_entry(JavaThread* thread, TRAPS) { duke@435: assert(thread->is_Compiler_thread(), "must be compiler thread"); duke@435: CompileBroker::compiler_thread_loop(); duke@435: } duke@435: duke@435: // Create a CompilerThread duke@435: CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) duke@435: : JavaThread(&compiler_thread_entry) { duke@435: _env = NULL; duke@435: _log = NULL; duke@435: _task = NULL; duke@435: _queue = queue; duke@435: _counters = counters; iveresov@1939: _buffer_blob = NULL; never@2916: _scanned_nmethod = NULL; duke@435: duke@435: #ifndef PRODUCT duke@435: _ideal_graph_printer = NULL; duke@435: #endif duke@435: } duke@435: stefank@4298: void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { stefank@4298: JavaThread::oops_do(f, cld_f, cf); never@2916: if (_scanned_nmethod != NULL && cf != NULL) { never@2916: // Safepoints can occur when the sweeper is scanning an nmethod so never@2916: // process it here to make sure it isn't unloaded in the middle of never@2916: // a scan. never@2916: cf->do_code_blob(_scanned_nmethod); never@2916: } never@2916: } duke@435: duke@435: // ======= Threads ======== duke@435: duke@435: // The Threads class links together all active threads, and provides duke@435: // operations over all threads. It is protected by its own Mutex duke@435: // lock, which is also used in other contexts to protect thread duke@435: // operations from having the thread being operated on from exiting duke@435: // and going away unexpectedly (e.g., safepoint synchronization) duke@435: duke@435: JavaThread* Threads::_thread_list = NULL; duke@435: int Threads::_number_of_threads = 0; duke@435: int Threads::_number_of_non_daemon_threads = 0; duke@435: int Threads::_return_code = 0; duke@435: size_t JavaThread::_stack_size_at_create = 0; coleenp@4037: #ifdef ASSERT coleenp@4037: bool Threads::_vm_complete = false; coleenp@4037: #endif duke@435: duke@435: // All JavaThreads duke@435: #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) duke@435: duke@435: void os_stream(); duke@435: duke@435: // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) duke@435: void Threads::threads_do(ThreadClosure* tc) { duke@435: assert_locked_or_safepoint(Threads_lock); duke@435: // ALL_JAVA_THREADS iterates through all JavaThreads duke@435: ALL_JAVA_THREADS(p) { duke@435: tc->do_thread(p); duke@435: } duke@435: // Someday we could have a table or list of all non-JavaThreads. duke@435: // For now, just manually iterate through them. duke@435: tc->do_thread(VMThread::vm_thread()); duke@435: Universe::heap()->gc_threads_do(tc); xlu@758: WatcherThread *wt = WatcherThread::watcher_thread(); xlu@758: // Strictly speaking, the following NULL check isn't sufficient to make sure xlu@758: // the data for WatcherThread is still valid upon being examined. However, xlu@758: // considering that WatchThread terminates when the VM is on the way to xlu@758: // exit at safepoint, the chance of the above is extremely small. The right xlu@758: // way to prevent termination of WatcherThread would be to acquire xlu@758: // Terminator_lock, but we can't do that without violating the lock rank xlu@758: // checking in some cases. xlu@758: if (wt != NULL) xlu@758: tc->do_thread(wt); xlu@758: duke@435: // If CompilerThreads ever become non-JavaThreads, add them here duke@435: } duke@435: duke@435: jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { duke@435: kamg@677: extern void JDK_Version_init(); kamg@677: duke@435: // Check version duke@435: if (!is_supported_jni_version(args->version)) return JNI_EVERSION; duke@435: duke@435: // Initialize the output stream module duke@435: ostream_init(); duke@435: duke@435: // Process java launcher properties. duke@435: Arguments::process_sun_java_launcher_properties(args); duke@435: duke@435: // Initialize the os module before using TLS duke@435: os::init(); duke@435: duke@435: // Initialize system properties. duke@435: Arguments::init_system_properties(); duke@435: kamg@677: // So that JDK version can be used as a discrimintor when parsing arguments kamg@677: JDK_Version_init(); kamg@677: zgu@2219: // Update/Initialize System properties after JDK version number is known zgu@2219: Arguments::init_version_specific_system_properties(); zgu@2219: duke@435: // Parse arguments duke@435: jint parse_result = Arguments::parse(args); duke@435: if (parse_result != JNI_OK) return parse_result; duke@435: duke@435: if (PauseAtStartup) { duke@435: os::pause(); duke@435: } duke@435: dcubed@3202: #ifndef USDT2 duke@435: HS_DTRACE_PROBE(hotspot, vm__init__begin); dcubed@3202: #else /* USDT2 */ dcubed@3202: HOTSPOT_VM_INIT_BEGIN(); dcubed@3202: #endif /* USDT2 */ duke@435: duke@435: // Record VM creation timing statistics duke@435: TraceVmCreationTime create_vm_timer; duke@435: create_vm_timer.start(); duke@435: duke@435: // Timing (must come after argument parsing) duke@435: TraceTime timer("Create VM", TraceStartupTime); duke@435: duke@435: // Initialize the os module after parsing the args duke@435: jint os_init_2_result = os::init_2(); duke@435: if (os_init_2_result != JNI_OK) return os_init_2_result; duke@435: brutisso@4296: jint adjust_after_os_result = Arguments::adjust_after_os(); brutisso@4296: if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; brutisso@4296: zgu@3900: // intialize TLS zgu@3900: ThreadLocalStorage::init(); zgu@3900: zgu@3900: // Bootstrap native memory tracking, so it can start recording memory zgu@3900: // activities before worker thread is started. This is the first phase zgu@3900: // of bootstrapping, VM is currently running in single-thread mode. zgu@3900: MemTracker::bootstrap_single_thread(); zgu@3900: duke@435: // Initialize output stream logging duke@435: ostream_init_log(); duke@435: duke@435: // Convert -Xrun to -agentlib: if there is no JVM_OnLoad duke@435: // Must be before create_vm_init_agents() duke@435: if (Arguments::init_libraries_at_startup()) { duke@435: convert_vm_init_libraries_to_agents(); duke@435: } duke@435: duke@435: // Launch -agentlib/-agentpath and converted -Xrun agents duke@435: if (Arguments::init_agents_at_startup()) { duke@435: create_vm_init_agents(); duke@435: } duke@435: duke@435: // Initialize Threads state duke@435: _thread_list = NULL; duke@435: _number_of_threads = 0; duke@435: _number_of_non_daemon_threads = 0; duke@435: duke@435: // Initialize global data structures and create system classes in heap duke@435: vm_init_globals(); duke@435: duke@435: // Attach the main thread to this os thread duke@435: JavaThread* main_thread = new JavaThread(); duke@435: main_thread->set_thread_state(_thread_in_vm); duke@435: // must do this before set_active_handles and initialize_thread_local_storage duke@435: // Note: on solaris initialize_thread_local_storage() will (indirectly) duke@435: // change the stack size recorded here to one based on the java thread duke@435: // stacksize. This adjusted size is what is used to figure the placement duke@435: // of the guard pages. duke@435: main_thread->record_stack_base_and_size(); duke@435: main_thread->initialize_thread_local_storage(); duke@435: duke@435: main_thread->set_active_handles(JNIHandleBlock::allocate_block()); duke@435: duke@435: if (!main_thread->set_as_starting_thread()) { duke@435: vm_shutdown_during_initialization( duke@435: "Failed necessary internal allocation. Out of swap space"); duke@435: delete main_thread; duke@435: *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again duke@435: return JNI_ENOMEM; duke@435: } duke@435: duke@435: // Enable guard page *after* os::create_main_thread(), otherwise it would duke@435: // crash Linux VM, see notes in os_linux.cpp. duke@435: main_thread->create_stack_guard_pages(); duke@435: acorn@2233: // Initialize Java-Level synchronization subsystem acorn@2233: ObjectMonitor::Initialize() ; duke@435: zgu@3900: // Second phase of bootstrapping, VM is about entering multi-thread mode zgu@3900: MemTracker::bootstrap_multi_thread(); zgu@3900: duke@435: // Initialize global modules duke@435: jint status = init_globals(); duke@435: if (status != JNI_OK) { duke@435: delete main_thread; duke@435: *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again duke@435: return status; duke@435: } duke@435: bobv@2036: // Should be done after the heap is fully created bobv@2036: main_thread->cache_global_variables(); bobv@2036: duke@435: HandleMark hm; duke@435: duke@435: { MutexLocker mu(Threads_lock); duke@435: Threads::add(main_thread); duke@435: } duke@435: duke@435: // Any JVMTI raw monitors entered in onload will transition into duke@435: // real raw monitor. VM is setup enough here for raw monitor enter. duke@435: JvmtiExport::transition_pending_onload_raw_monitors(); duke@435: zgu@3900: // Fully start NMT zgu@3900: MemTracker::start(); zgu@3900: duke@435: // Create the VMThread duke@435: { TraceTime timer("Start VMThread", TraceStartupTime); duke@435: VMThread::create(); duke@435: Thread* vmthread = VMThread::vm_thread(); duke@435: duke@435: if (!os::create_thread(vmthread, os::vm_thread)) duke@435: vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); duke@435: duke@435: // Wait for the VM thread to become ready, and VMThread::run to initialize duke@435: // Monitors can have spurious returns, must always check another state flag duke@435: { duke@435: MutexLocker ml(Notify_lock); duke@435: os::start_thread(vmthread); duke@435: while (vmthread->active_handles() == NULL) { duke@435: Notify_lock->wait(); duke@435: } duke@435: } duke@435: } duke@435: duke@435: assert (Universe::is_fully_initialized(), "not initialized"); johnc@4899: if (VerifyDuringStartup) { stefank@5018: // Make sure we're starting with a clean slate. stefank@5018: VM_Verify verify_op; johnc@4899: VMThread::execute(&verify_op); johnc@4855: } johnc@4855: duke@435: EXCEPTION_MARK; duke@435: duke@435: // At this point, the Universe is initialized, but we have not executed duke@435: // any byte code. Now is a good time (the only time) to dump out the duke@435: // internal state of the JVM for sharing. duke@435: if (DumpSharedSpaces) { coleenp@4037: MetaspaceShared::preload_and_dump(CHECK_0); duke@435: ShouldNotReachHere(); duke@435: } duke@435: duke@435: // Always call even when there are not JVMTI environments yet, since environments duke@435: // may be attached late and JVMTI must track phases of VM execution duke@435: JvmtiExport::enter_start_phase(); duke@435: duke@435: // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. duke@435: JvmtiExport::post_vm_start(); duke@435: duke@435: { duke@435: TraceTime timer("Initialize java.lang classes", TraceStartupTime); duke@435: duke@435: if (EagerXrunInit && Arguments::init_libraries_at_startup()) { duke@435: create_vm_init_libraries(); duke@435: } duke@435: brutisso@4451: initialize_class(vmSymbols::java_lang_String(), CHECK_0); duke@435: duke@435: // Initialize java_lang.System (needed before creating the thread) brutisso@4451: initialize_class(vmSymbols::java_lang_System(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); brutisso@4451: Handle thread_group = create_initial_thread_group(CHECK_0); brutisso@4451: Universe::set_main_thread_group(thread_group()); brutisso@4451: initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); brutisso@4451: oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); brutisso@4451: main_thread->set_threadObj(thread_object); brutisso@4451: // Set thread status to running since main thread has brutisso@4451: // been started and running. brutisso@4451: java_lang_Thread::set_thread_status(thread_object, brutisso@4451: java_lang_Thread::RUNNABLE); brutisso@4451: brutisso@4451: // The VM creates & returns objects of this class. Make sure it's initialized. brutisso@4451: initialize_class(vmSymbols::java_lang_Class(), CHECK_0); brutisso@4451: brutisso@4451: // The VM preresolves methods to these classes. Make sure that they get initialized brutisso@4451: initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); brutisso@4451: call_initializeSystemClass(CHECK_0); brutisso@4451: brutisso@4451: // get the Java runtime name after java.lang.System is initialized brutisso@4451: JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); brutisso@4451: JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); duke@435: duke@435: // an instance of OutOfMemory exception has been allocated earlier brutisso@4451: initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); brutisso@4451: initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); twisti@2698: } duke@435: duke@435: // See : bugid 4211085. duke@435: // Background : the static initializer of java.lang.Compiler tries to read duke@435: // property"java.compiler" and read & write property "java.vm.info". duke@435: // When a security manager is installed through the command line duke@435: // option "-Djava.security.manager", the above properties are not duke@435: // readable and the static initializer for java.lang.Compiler fails duke@435: // resulting in a NoClassDefFoundError. This can happen in any duke@435: // user code which calls methods in java.lang.Compiler. duke@435: // Hack : the hack is to pre-load and initialize this class, so that only duke@435: // system domains are on the stack when the properties are read. duke@435: // Currently even the AWT code has calls to methods in java.lang.Compiler. duke@435: // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. duke@435: // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and duke@435: // read and write"java.vm.info" in the default policy file. See bugid 4211383 duke@435: // Once that is done, we should remove this hack. coleenp@2497: initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); duke@435: duke@435: // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to duke@435: // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot duke@435: // compiler does not get loaded through java.lang.Compiler). "java -version" with the duke@435: // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. duke@435: // This should also be taken out as soon as 4211383 gets fixed. duke@435: reset_vm_info_property(CHECK_0); duke@435: duke@435: quicken_jni_functions(); duke@435: fparain@3559: // Must be run after init_ft which initializes ft_enabled fparain@3559: if (TRACE_INITIALIZE() != JNI_OK) { fparain@3559: vm_exit_during_initialization("Failed to initialize tracing backend"); fparain@3559: } fparain@3559: duke@435: // Set flag that basic initialization has completed. Used by exceptions and various duke@435: // debug stuff, that does not work until all basic classes have been initialized. duke@435: set_init_completed(); duke@435: dcubed@3202: #ifndef USDT2 duke@435: HS_DTRACE_PROBE(hotspot, vm__init__end); dcubed@3202: #else /* USDT2 */ dcubed@3202: HOTSPOT_VM_INIT_END(); dcubed@3202: #endif /* USDT2 */ duke@435: duke@435: // record VM initialization completion time jprovino@4165: #if INCLUDE_MANAGEMENT duke@435: Management::record_vm_init_completed(); jprovino@4165: #endif // INCLUDE_MANAGEMENT duke@435: duke@435: // Compute system loader. Note that this has to occur after set_init_completed, since duke@435: // valid exceptions may be thrown in the process. duke@435: // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and duke@435: // set_init_completed has just been called, causing exceptions not to be shortcut duke@435: // anymore. We call vm_exit_during_initialization directly instead. duke@435: SystemDictionary::compute_java_system_loader(THREAD); duke@435: if (HAS_PENDING_EXCEPTION) { duke@435: vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); duke@435: } duke@435: jprovino@4542: #if INCLUDE_ALL_GCS duke@435: // Support for ConcurrentMarkSweep. This should be cleaned up ysr@777: // and better encapsulated. The ugly nested if test would go away ysr@777: // once things are properly refactored. XXX YSR ysr@777: if (UseConcMarkSweepGC || UseG1GC) { ysr@777: if (UseConcMarkSweepGC) { ysr@777: ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); ysr@777: } else { ysr@777: ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); ysr@777: } duke@435: if (HAS_PENDING_EXCEPTION) { duke@435: vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); duke@435: } duke@435: } jprovino@4542: #endif // INCLUDE_ALL_GCS duke@435: duke@435: // Always call even when there are not JVMTI environments yet, since environments duke@435: // may be attached late and JVMTI must track phases of VM execution duke@435: JvmtiExport::enter_live_phase(); duke@435: duke@435: // Signal Dispatcher needs to be started before VMInit event is posted duke@435: os::signal_init(); duke@435: duke@435: // Start Attach Listener if +StartAttachListener or it can't be started lazily duke@435: if (!DisableAttachMechanism) { allwin@5412: AttachListener::vm_start(); duke@435: if (StartAttachListener || AttachListener::init_at_startup()) { duke@435: AttachListener::init(); duke@435: } duke@435: } duke@435: duke@435: // Launch -Xrun agents duke@435: // Must be done in the JVMTI live phase so that for backward compatibility the JDWP duke@435: // back-end can launch with -Xdebug -Xrunjdwp. duke@435: if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { duke@435: create_vm_init_libraries(); duke@435: } duke@435: rbackman@3705: // Notify JVMTI agents that VM initialization is complete - nop if no agents. rbackman@3705: JvmtiExport::post_vm_initialized(); rbackman@3705: sla@5237: if (TRACE_START() != JNI_OK) { sla@5237: vm_exit_during_initialization("Failed to start tracing backend."); phh@3427: } phh@3427: jcoomes@2996: if (CleanChunkPoolAsync) { jcoomes@2996: Chunk::start_chunk_pool_cleaner_task(); jcoomes@2996: } duke@435: duke@435: // initialize compiler(s) twisti@4314: #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) duke@435: CompileBroker::compilation_init(); jprovino@4165: #endif jprovino@4165: vlivanov@5631: if (EnableInvokeDynamic) { vlivanov@5631: // Pre-initialize some JSR292 core classes to avoid deadlock during class loading. vlivanov@5631: // It is done after compilers are initialized, because otherwise compilations of vlivanov@5631: // signature polymorphic MH intrinsics can be missed vlivanov@5631: // (see SystemDictionary::find_method_handle_intrinsic). vlivanov@5631: initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK_0); vlivanov@5631: initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK_0); vlivanov@5631: initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK_0); vlivanov@5631: } vlivanov@5631: jprovino@4165: #if INCLUDE_MANAGEMENT duke@435: Management::initialize(THREAD); jprovino@4165: #endif // INCLUDE_MANAGEMENT jprovino@4165: duke@435: if (HAS_PENDING_EXCEPTION) { duke@435: // management agent fails to start possibly due to duke@435: // configuration problem and is responsible for printing duke@435: // stack trace if appropriate. Simply exit VM. duke@435: vm_exit(1); duke@435: } duke@435: duke@435: if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); duke@435: if (MemProfiling) MemProfiler::engage(); duke@435: StatSampler::engage(); duke@435: if (CheckJNICalls) JniPeriodicChecker::engage(); duke@435: duke@435: BiasedLocking::init(); duke@435: kevinw@2449: if (JDK_Version::current().post_vm_init_hook_enabled()) { kevinw@2449: call_postVMInitHook(THREAD); kevinw@2449: // The Java side of PostVMInitHook.run must deal with all kevinw@2449: // exceptions and provide means of diagnosis. kevinw@2449: if (HAS_PENDING_EXCEPTION) { kevinw@2449: CLEAR_PENDING_EXCEPTION; kevinw@2449: } kevinw@2449: } duke@435: rbackman@4250: { rbackman@4250: MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); rbackman@4250: // Make sure the watcher thread can be started by WatcherThread::start() rbackman@4250: // or by dynamic enrollment. rbackman@4250: WatcherThread::make_startable(); rbackman@4250: // Start up the WatcherThread if there are any periodic tasks rbackman@4250: // NOTE: All PeriodicTasks should be registered by now. If they rbackman@4250: // aren't, late joiners might appear to start slowly (we might rbackman@4250: // take a while to process their first tick). rbackman@4250: if (PeriodicTask::num_tasks() > 0) { rbackman@4250: WatcherThread::start(); rbackman@4250: } duke@435: } duke@435: bobv@2036: // Give os specific code one last chance to start bobv@2036: os::init_3(); bobv@2036: duke@435: create_vm_timer.end(); coleenp@4037: #ifdef ASSERT coleenp@4037: _vm_complete = true; coleenp@4037: #endif duke@435: return JNI_OK; duke@435: } duke@435: duke@435: // type for the Agent_OnLoad and JVM_OnLoad entry points duke@435: extern "C" { duke@435: typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); duke@435: } duke@435: // Find a command line agent library and return its entry point for duke@435: // -agentlib: -agentpath: -Xrun duke@435: // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. duke@435: static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { duke@435: OnLoadEntry_t on_load_entry = NULL; bpittore@5585: void *library = NULL; bpittore@5585: bpittore@5585: if (!agent->valid()) { duke@435: char buffer[JVM_MAXPATHLEN]; duke@435: char ebuf[1024]; duke@435: const char *name = agent->name(); rasbold@2049: const char *msg = "Could not find agent library "; duke@435: bpittore@5585: // First check to see if agent is statcally linked into executable bpittore@5585: if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) { bpittore@5585: library = agent->os_lib(); bpittore@5585: } else if (agent->is_absolute_path()) { ikrylov@2322: library = os::dll_load(name, ebuf, sizeof ebuf); duke@435: if (library == NULL) { rasbold@2049: const char *sub_msg = " in absolute path, with error: "; rasbold@2049: size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; zgu@3900: char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); rasbold@2049: jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); duke@435: // If we can't find the agent, exit. rasbold@2049: vm_exit_during_initialization(buf, NULL); zgu@3900: FREE_C_HEAP_ARRAY(char, buf, mtThread); duke@435: } duke@435: } else { duke@435: // Try to load the agent from the standard dll directory bpittore@4261: if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), bpittore@4261: name)) { bpittore@4261: library = os::dll_load(buffer, ebuf, sizeof ebuf); bpittore@4261: } duke@435: if (library == NULL) { // Try the local directory duke@435: char ns[1] = {0}; bpittore@4261: if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { bpittore@4261: library = os::dll_load(buffer, ebuf, sizeof ebuf); bpittore@4261: } duke@435: if (library == NULL) { rasbold@2049: const char *sub_msg = " on the library path, with error: "; rasbold@2049: size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; zgu@3900: char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); rasbold@2049: jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); duke@435: // If we can't find the agent, exit. rasbold@2049: vm_exit_during_initialization(buf, NULL); zgu@3900: FREE_C_HEAP_ARRAY(char, buf, mtThread); duke@435: } duke@435: } duke@435: } duke@435: agent->set_os_lib(library); bpittore@5585: agent->set_valid(); duke@435: } duke@435: duke@435: // Find the OnLoad function. bpittore@5585: on_load_entry = bpittore@5585: CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent, bpittore@5585: false, bpittore@5585: on_load_symbols, bpittore@5585: num_symbol_entries)); duke@435: return on_load_entry; duke@435: } duke@435: duke@435: // Find the JVM_OnLoad entry point duke@435: static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { duke@435: const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; duke@435: return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); duke@435: } duke@435: duke@435: // Find the Agent_OnLoad entry point duke@435: static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { duke@435: const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; duke@435: return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); duke@435: } duke@435: duke@435: // For backwards compatibility with -Xrun duke@435: // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be duke@435: // treated like -agentpath: duke@435: // Must be called before agent libraries are created duke@435: void Threads::convert_vm_init_libraries_to_agents() { duke@435: AgentLibrary* agent; duke@435: AgentLibrary* next; duke@435: duke@435: for (agent = Arguments::libraries(); agent != NULL; agent = next) { duke@435: next = agent->next(); // cache the next agent now as this agent may get moved off this list duke@435: OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); duke@435: duke@435: // If there is an JVM_OnLoad function it will get called later, duke@435: // otherwise see if there is an Agent_OnLoad duke@435: if (on_load_entry == NULL) { duke@435: on_load_entry = lookup_agent_on_load(agent); duke@435: if (on_load_entry != NULL) { duke@435: // switch it to the agent list -- so that Agent_OnLoad will be called, duke@435: // JVM_OnLoad won't be attempted and Agent_OnUnload will duke@435: Arguments::convert_library_to_agent(agent); duke@435: } else { duke@435: vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); duke@435: } duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Create agents for -agentlib: -agentpath: and converted -Xrun duke@435: // Invokes Agent_OnLoad duke@435: // Called very early -- before JavaThreads exist duke@435: void Threads::create_vm_init_agents() { duke@435: extern struct JavaVM_ main_vm; duke@435: AgentLibrary* agent; duke@435: duke@435: JvmtiExport::enter_onload_phase(); jprovino@4165: duke@435: for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { duke@435: OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); duke@435: duke@435: if (on_load_entry != NULL) { duke@435: // Invoke the Agent_OnLoad function duke@435: jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); duke@435: if (err != JNI_OK) { duke@435: vm_exit_during_initialization("agent library failed to init", agent->name()); duke@435: } duke@435: } else { duke@435: vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); duke@435: } duke@435: } duke@435: JvmtiExport::enter_primordial_phase(); duke@435: } duke@435: duke@435: extern "C" { duke@435: typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); duke@435: } duke@435: duke@435: void Threads::shutdown_vm_agents() { duke@435: // Send any Agent_OnUnload notifications duke@435: const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; bpittore@5585: size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols); duke@435: extern struct JavaVM_ main_vm; duke@435: for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { duke@435: duke@435: // Find the Agent_OnUnload function. bpittore@5585: Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, bpittore@5585: os::find_agent_function(agent, bpittore@5585: false, bpittore@5585: on_unload_symbols, bpittore@5585: num_symbol_entries)); bpittore@5585: bpittore@5585: // Invoke the Agent_OnUnload function bpittore@5585: if (unload_entry != NULL) { bpittore@5585: JavaThread* thread = JavaThread::current(); bpittore@5585: ThreadToNativeFromVM ttn(thread); bpittore@5585: HandleMark hm(thread); bpittore@5585: (*unload_entry)(&main_vm); duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries duke@435: // Invokes JVM_OnLoad duke@435: void Threads::create_vm_init_libraries() { duke@435: extern struct JavaVM_ main_vm; duke@435: AgentLibrary* agent; duke@435: duke@435: for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { duke@435: OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); duke@435: duke@435: if (on_load_entry != NULL) { duke@435: // Invoke the JVM_OnLoad function duke@435: JavaThread* thread = JavaThread::current(); duke@435: ThreadToNativeFromVM ttn(thread); duke@435: HandleMark hm(thread); duke@435: jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); duke@435: if (err != JNI_OK) { duke@435: vm_exit_during_initialization("-Xrun library failed to init", agent->name()); duke@435: } duke@435: } else { duke@435: vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); duke@435: } duke@435: } duke@435: } duke@435: duke@435: // Last thread running calls java.lang.Shutdown.shutdown() duke@435: void JavaThread::invoke_shutdown_hooks() { duke@435: HandleMark hm(this); duke@435: duke@435: // We could get here with a pending exception, if so clear it now. duke@435: if (this->has_pending_exception()) { duke@435: this->clear_pending_exception(); duke@435: } duke@435: duke@435: EXCEPTION_MARK; coleenp@4037: Klass* k = coleenp@2497: SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), duke@435: THREAD); duke@435: if (k != NULL) { duke@435: // SystemDictionary::resolve_or_null will return null if there was duke@435: // an exception. If we cannot load the Shutdown class, just don't duke@435: // call Shutdown.shutdown() at all. This will mean the shutdown hooks duke@435: // and finalizers (if runFinalizersOnExit is set) won't be run. duke@435: // Note that if a shutdown hook was registered or runFinalizersOnExit duke@435: // was called, the Shutdown class would have already been loaded duke@435: // (Runtime.addShutdownHook and runFinalizersOnExit will load it). duke@435: instanceKlassHandle shutdown_klass (THREAD, k); duke@435: JavaValue result(T_VOID); duke@435: JavaCalls::call_static(&result, duke@435: shutdown_klass, coleenp@2497: vmSymbols::shutdown_method_name(), coleenp@2497: vmSymbols::void_method_signature(), duke@435: THREAD); duke@435: } duke@435: CLEAR_PENDING_EXCEPTION; duke@435: } duke@435: duke@435: // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when duke@435: // the program falls off the end of main(). Another VM exit path is through duke@435: // vm_exit() when the program calls System.exit() to return a value or when duke@435: // there is a serious error in VM. The two shutdown paths are not exactly duke@435: // the same, but they share Shutdown.shutdown() at Java level and before_exit() duke@435: // and VM_Exit op at VM level. duke@435: // duke@435: // Shutdown sequence: zgu@3900: // + Shutdown native memory tracking if it is on duke@435: // + Wait until we are the last non-daemon thread to execute duke@435: // <-- every thing is still working at this moment --> duke@435: // + Call java.lang.Shutdown.shutdown(), which will invoke Java level duke@435: // shutdown hooks, run finalizers if finalization-on-exit duke@435: // + Call before_exit(), prepare for VM exit duke@435: // > run VM level shutdown hooks (they are registered through JVM_OnExit(), duke@435: // currently the only user of this mechanism is File.deleteOnExit()) duke@435: // > stop flat profiler, StatSampler, watcher thread, CMS threads, duke@435: // post thread end and vm death events to JVMTI, duke@435: // stop signal thread duke@435: // + Call JavaThread::exit(), it will: duke@435: // > release JNI handle blocks, remove stack guard pages duke@435: // > remove this thread from Threads list duke@435: // <-- no more Java code from this thread after this point --> duke@435: // + Stop VM thread, it will bring the remaining VM to a safepoint and stop duke@435: // the compiler threads at safepoint duke@435: // <-- do not use anything that could get blocked by Safepoint --> duke@435: // + Disable tracing at JNI/JVM barriers duke@435: // + Set _vm_exited flag for threads that are still running native code duke@435: // + Delete this thread duke@435: // + Call exit_globals() duke@435: // > deletes tty duke@435: // > deletes PerfMemory resources duke@435: // + Return to caller duke@435: duke@435: bool Threads::destroy_vm() { duke@435: JavaThread* thread = JavaThread::current(); duke@435: coleenp@4037: #ifdef ASSERT coleenp@4037: _vm_complete = false; coleenp@4037: #endif duke@435: // Wait until we are the last non-daemon thread to execute duke@435: { MutexLocker nu(Threads_lock); duke@435: while (Threads::number_of_non_daemon_threads() > 1 ) duke@435: // This wait should make safepoint checks, wait without a timeout, duke@435: // and wait as a suspend-equivalent condition. duke@435: // duke@435: // Note: If the FlatProfiler is running and this thread is waiting duke@435: // for another non-daemon thread to finish, then the FlatProfiler duke@435: // is waiting for the external suspend request on this thread to duke@435: // complete. wait_for_ext_suspend_completion() will eventually duke@435: // timeout, but that takes time. Making this wait a suspend- duke@435: // equivalent condition solves that timeout problem. duke@435: // duke@435: Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, duke@435: Mutex::_as_suspend_equivalent_flag); duke@435: } duke@435: duke@435: // Hang forever on exit if we are reporting an error. duke@435: if (ShowMessageBoxOnError && is_error_reported()) { duke@435: os::infinite_sleep(); duke@435: } sla@2584: os::wait_for_keypress_at_exit(); duke@435: duke@435: if (JDK_Version::is_jdk12x_version()) { duke@435: // We are the last thread running, so check if finalizers should be run. duke@435: // For 1.3 or later this is done in thread->invoke_shutdown_hooks() duke@435: HandleMark rm(thread); duke@435: Universe::run_finalizers_on_exit(); duke@435: } else { duke@435: // run Java level shutdown hooks duke@435: thread->invoke_shutdown_hooks(); duke@435: } duke@435: duke@435: before_exit(thread); duke@435: duke@435: thread->exit(true); duke@435: duke@435: // Stop VM thread. duke@435: { duke@435: // 4945125 The vm thread comes to a safepoint during exit. duke@435: // GC vm_operations can get caught at the safepoint, and the duke@435: // heap is unparseable if they are caught. Grab the Heap_lock duke@435: // to prevent this. The GC vm_operations will not be able to duke@435: // queue until after the vm thread is dead. ysr@2966: // After this point, we'll never emerge out of the safepoint before ysr@2966: // the VM exits, so concurrent GC threads do not need to be explicitly ysr@2966: // stopped; they remain inactive until the process exits. ysr@2966: // Note: some concurrent G1 threads may be running during a safepoint, ysr@2966: // but these will not be accessing the heap, just some G1-specific side ysr@2966: // data structures that are not accessed by any other threads but them ysr@2966: // after this point in a terminal safepoint. ysr@2966: duke@435: MutexLocker ml(Heap_lock); duke@435: duke@435: VMThread::wait_for_vm_thread_exit(); duke@435: assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); duke@435: VMThread::destroy(); duke@435: } duke@435: duke@435: // clean up ideal graph printers duke@435: #if defined(COMPILER2) && !defined(PRODUCT) duke@435: IdealGraphPrinter::clean_up(); duke@435: #endif duke@435: duke@435: // Now, all Java threads are gone except daemon threads. Daemon threads duke@435: // running Java code or in VM are stopped by the Safepoint. However, duke@435: // daemon threads executing native code are still running. But they duke@435: // will be stopped at native=>Java/VM barriers. Note that we can't duke@435: // simply kill or suspend them, as it is inherently deadlock-prone. duke@435: duke@435: #ifndef PRODUCT duke@435: // disable function tracing at JNI/JVM barriers duke@435: TraceJNICalls = false; duke@435: TraceJVMCalls = false; duke@435: TraceRuntimeCalls = false; duke@435: #endif duke@435: duke@435: VM_Exit::set_vm_exited(); duke@435: duke@435: notify_vm_shutdown(); duke@435: duke@435: delete thread; duke@435: duke@435: // exit_globals() will delete tty duke@435: exit_globals(); duke@435: duke@435: return true; duke@435: } duke@435: duke@435: duke@435: jboolean Threads::is_supported_jni_version_including_1_1(jint version) { duke@435: if (version == JNI_VERSION_1_1) return JNI_TRUE; duke@435: return is_supported_jni_version(version); duke@435: } duke@435: duke@435: duke@435: jboolean Threads::is_supported_jni_version(jint version) { duke@435: if (version == JNI_VERSION_1_2) return JNI_TRUE; duke@435: if (version == JNI_VERSION_1_4) return JNI_TRUE; duke@435: if (version == JNI_VERSION_1_6) return JNI_TRUE; bpittore@4793: if (version == JNI_VERSION_1_8) return JNI_TRUE; duke@435: return JNI_FALSE; duke@435: } duke@435: duke@435: duke@435: void Threads::add(JavaThread* p, bool force_daemon) { duke@435: // The threads lock must be owned at this point duke@435: assert_locked_or_safepoint(Threads_lock); tonyp@2197: tonyp@2197: // See the comment for this method in thread.hpp for its purpose and tonyp@2197: // why it is called here. tonyp@2197: p->initialize_queues(); duke@435: p->set_next(_thread_list); duke@435: _thread_list = p; duke@435: _number_of_threads++; duke@435: oop threadObj = p->threadObj(); duke@435: bool daemon = true; duke@435: // Bootstrapping problem: threadObj can be null for initial duke@435: // JavaThread (or for threads attached via JNI) duke@435: if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { duke@435: _number_of_non_daemon_threads++; duke@435: daemon = false; duke@435: } duke@435: zgu@3900: p->set_safepoint_visible(true); zgu@3900: duke@435: ThreadService::add_thread(p, daemon); duke@435: duke@435: // Possible GC point. never@3499: Events::log(p, "Thread added: " INTPTR_FORMAT, p); duke@435: } duke@435: duke@435: void Threads::remove(JavaThread* p) { duke@435: // Extra scope needed for Thread_lock, so we can check duke@435: // that we do not remove thread without safepoint code notice duke@435: { MutexLocker ml(Threads_lock); duke@435: duke@435: assert(includes(p), "p must be present"); duke@435: duke@435: JavaThread* current = _thread_list; duke@435: JavaThread* prev = NULL; duke@435: duke@435: while (current != p) { duke@435: prev = current; duke@435: current = current->next(); duke@435: } duke@435: duke@435: if (prev) { duke@435: prev->set_next(current->next()); duke@435: } else { duke@435: _thread_list = p->next(); duke@435: } duke@435: _number_of_threads--; duke@435: oop threadObj = p->threadObj(); duke@435: bool daemon = true; duke@435: if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { duke@435: _number_of_non_daemon_threads--; duke@435: daemon = false; duke@435: duke@435: // Only one thread left, do a notify on the Threads_lock so a thread waiting duke@435: // on destroy_vm will wake up. duke@435: if (number_of_non_daemon_threads() == 1) duke@435: Threads_lock->notify_all(); duke@435: } duke@435: ThreadService::remove_thread(p, daemon); duke@435: duke@435: // Make sure that safepoint code disregard this thread. This is needed since duke@435: // the thread might mess around with locks after this point. This can cause it duke@435: // to do callbacks into the safepoint code. However, the safepoint code is not aware duke@435: // of this thread since it is removed from the queue. duke@435: p->set_terminated_value(); zgu@3900: zgu@3900: // Now, this thread is not visible to safepoint zgu@3900: p->set_safepoint_visible(false); zgu@4193: // once the thread becomes safepoint invisible, we can not use its per-thread zgu@4193: // recorder. And Threads::do_threads() no longer walks this thread, so we have zgu@4193: // to release its per-thread recorder here. zgu@4193: MemTracker::thread_exiting(p); duke@435: } // unlock Threads_lock duke@435: duke@435: // Since Events::log uses a lock, we grab it outside the Threads_lock never@3499: Events::log(p, "Thread exited: " INTPTR_FORMAT, p); duke@435: } duke@435: duke@435: // Threads_lock must be held when this is called (or must be called during a safepoint) duke@435: bool Threads::includes(JavaThread* p) { duke@435: assert(Threads_lock->is_locked(), "sanity check"); duke@435: ALL_JAVA_THREADS(q) { duke@435: if (q == p ) { duke@435: return true; duke@435: } duke@435: } duke@435: return false; duke@435: } duke@435: duke@435: // Operations on the Threads list for GC. These are not explicitly locked, duke@435: // but the garbage collector must provide a safe context for them to run. duke@435: // In particular, these things should never be called when the Threads_lock duke@435: // is held by some other thread. (Note: the Safepoint abstraction also duke@435: // uses the Threads_lock to gurantee this property. It also makes sure that duke@435: // all threads gets blocked when exiting or starting). duke@435: stefank@4298: void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { duke@435: ALL_JAVA_THREADS(p) { stefank@4298: p->oops_do(f, cld_f, cf); duke@435: } stefank@4298: VMThread::vm_thread()->oops_do(f, cld_f, cf); duke@435: } duke@435: stefank@4298: void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { duke@435: // Introduce a mechanism allowing parallel threads to claim threads as duke@435: // root groups. Overhead should be small enough to use all the time, duke@435: // even in sequential code. duke@435: SharedHeap* sh = SharedHeap::heap(); jmasa@3294: // Cannot yet substitute active_workers for n_par_threads jmasa@3294: // because of G1CollectedHeap::verify() use of jmasa@3294: // SharedHeap::process_strong_roots(). n_par_threads == 0 will jmasa@3294: // turn off parallelism in process_strong_roots while active_workers jmasa@3294: // is being used for parallelism elsewhere. jmasa@3294: bool is_par = sh->n_par_threads() > 0; jmasa@3294: assert(!is_par || jmasa@3294: (SharedHeap::heap()->n_par_threads() == jmasa@3294: SharedHeap::heap()->workers()->active_workers()), "Mismatch"); duke@435: int cp = SharedHeap::heap()->strong_roots_parity(); duke@435: ALL_JAVA_THREADS(p) { duke@435: if (p->claim_oops_do(is_par, cp)) { stefank@4298: p->oops_do(f, cld_f, cf); duke@435: } duke@435: } duke@435: VMThread* vmt = VMThread::vm_thread(); johnc@3175: if (vmt->claim_oops_do(is_par, cp)) { stefank@4298: vmt->oops_do(f, cld_f, cf); johnc@3175: } duke@435: } duke@435: jprovino@4542: #if INCLUDE_ALL_GCS duke@435: // Used by ParallelScavenge duke@435: void Threads::create_thread_roots_tasks(GCTaskQueue* q) { duke@435: ALL_JAVA_THREADS(p) { duke@435: q->enqueue(new ThreadRootsTask(p)); duke@435: } duke@435: q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); duke@435: } duke@435: duke@435: // Used by Parallel Old duke@435: void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { duke@435: ALL_JAVA_THREADS(p) { duke@435: q->enqueue(new ThreadRootsMarkingTask(p)); duke@435: } duke@435: q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); duke@435: } jprovino@4542: #endif // INCLUDE_ALL_GCS duke@435: jrose@1424: void Threads::nmethods_do(CodeBlobClosure* cf) { duke@435: ALL_JAVA_THREADS(p) { jrose@1424: p->nmethods_do(cf); duke@435: } jrose@1424: VMThread::vm_thread()->nmethods_do(cf); duke@435: } duke@435: coleenp@4037: void Threads::metadata_do(void f(Metadata*)) { coleenp@4037: ALL_JAVA_THREADS(p) { coleenp@4037: p->metadata_do(f); coleenp@4037: } coleenp@4037: } coleenp@4037: duke@435: void Threads::gc_epilogue() { duke@435: ALL_JAVA_THREADS(p) { duke@435: p->gc_epilogue(); duke@435: } duke@435: } duke@435: duke@435: void Threads::gc_prologue() { duke@435: ALL_JAVA_THREADS(p) { duke@435: p->gc_prologue(); duke@435: } duke@435: } duke@435: duke@435: void Threads::deoptimized_wrt_marked_nmethods() { duke@435: ALL_JAVA_THREADS(p) { duke@435: p->deoptimized_wrt_marked_nmethods(); duke@435: } duke@435: } duke@435: duke@435: duke@435: // Get count Java threads that are waiting to enter the specified monitor. duke@435: GrowableArray* Threads::get_pending_threads(int count, duke@435: address monitor, bool doLock) { duke@435: assert(doLock || SafepointSynchronize::is_at_safepoint(), duke@435: "must grab Threads_lock or be at safepoint"); duke@435: GrowableArray* result = new GrowableArray(count); duke@435: duke@435: int i = 0; duke@435: { duke@435: MutexLockerEx ml(doLock ? Threads_lock : NULL); duke@435: ALL_JAVA_THREADS(p) { duke@435: if (p->is_Compiler_thread()) continue; duke@435: duke@435: address pending = (address)p->current_pending_monitor(); duke@435: if (pending == monitor) { // found a match duke@435: if (i < count) result->append(p); // save the first count matches duke@435: i++; duke@435: } duke@435: } duke@435: } duke@435: return result; duke@435: } duke@435: duke@435: duke@435: JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { duke@435: assert(doLock || duke@435: Threads_lock->owned_by_self() || duke@435: SafepointSynchronize::is_at_safepoint(), duke@435: "must grab Threads_lock or be at safepoint"); duke@435: duke@435: // NULL owner means not locked so we can skip the search duke@435: if (owner == NULL) return NULL; duke@435: duke@435: { duke@435: MutexLockerEx ml(doLock ? Threads_lock : NULL); duke@435: ALL_JAVA_THREADS(p) { duke@435: // first, see if owner is the address of a Java thread duke@435: if (owner == (address)p) return p; duke@435: } duke@435: } dcubed@4673: // Cannot assert on lack of success here since this function may be dcubed@4673: // used by code that is trying to report useful problem information dcubed@4673: // like deadlock detection. duke@435: if (UseHeavyMonitors) return NULL; duke@435: duke@435: // duke@435: // If we didn't find a matching Java thread and we didn't force use of duke@435: // heavyweight monitors, then the owner is the stack address of the duke@435: // Lock Word in the owning Java thread's stack. duke@435: // duke@435: JavaThread* the_owner = NULL; duke@435: { duke@435: MutexLockerEx ml(doLock ? Threads_lock : NULL); duke@435: ALL_JAVA_THREADS(q) { xlu@1137: if (q->is_lock_owned(owner)) { duke@435: the_owner = q; xlu@1137: break; duke@435: } duke@435: } duke@435: } dcubed@4673: // cannot assert on lack of success here; see above comment duke@435: return the_owner; duke@435: } duke@435: duke@435: // Threads::print_on() is called at safepoint by VM_PrintThreads operation. duke@435: void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { duke@435: char buf[32]; duke@435: st->print_cr(os::local_time_string(buf, sizeof(buf))); duke@435: duke@435: st->print_cr("Full thread dump %s (%s %s):", duke@435: Abstract_VM_Version::vm_name(), duke@435: Abstract_VM_Version::vm_release(), duke@435: Abstract_VM_Version::vm_info_string() duke@435: ); duke@435: st->cr(); duke@435: jprovino@4542: #if INCLUDE_ALL_GCS duke@435: // Dump concurrent locks duke@435: ConcurrentLocksDump concurrent_locks; duke@435: if (print_concurrent_locks) { duke@435: concurrent_locks.dump_at_safepoint(); duke@435: } jprovino@4542: #endif // INCLUDE_ALL_GCS duke@435: duke@435: ALL_JAVA_THREADS(p) { duke@435: ResourceMark rm; duke@435: p->print_on(st); duke@435: if (print_stacks) { duke@435: if (internal_format) { duke@435: p->trace_stack(); duke@435: } else { duke@435: p->print_stack_on(st); duke@435: } duke@435: } duke@435: st->cr(); jprovino@4542: #if INCLUDE_ALL_GCS duke@435: if (print_concurrent_locks) { duke@435: concurrent_locks.print_locks_on(p, st); duke@435: } jprovino@4542: #endif // INCLUDE_ALL_GCS duke@435: } duke@435: duke@435: VMThread::vm_thread()->print_on(st); duke@435: st->cr(); duke@435: Universe::heap()->print_gc_threads_on(st); duke@435: WatcherThread* wt = WatcherThread::watcher_thread(); dholmes@4077: if (wt != NULL) { dholmes@4077: wt->print_on(st); dholmes@4077: st->cr(); dholmes@4077: } duke@435: CompileBroker::print_compiler_threads_on(st); duke@435: st->flush(); duke@435: } duke@435: duke@435: // Threads::print_on_error() is called by fatal error handler. It's possible duke@435: // that VM is not at safepoint and/or current thread is inside signal handler. duke@435: // Don't print stack trace, as the stack may not be walkable. Don't allocate duke@435: // memory (even in resource area), it might deadlock the error handler. duke@435: void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { duke@435: bool found_current = false; duke@435: st->print_cr("Java Threads: ( => current thread )"); duke@435: ALL_JAVA_THREADS(thread) { duke@435: bool is_current = (current == thread); duke@435: found_current = found_current || is_current; duke@435: duke@435: st->print("%s", is_current ? "=>" : " "); duke@435: duke@435: st->print(PTR_FORMAT, thread); duke@435: st->print(" "); duke@435: thread->print_on_error(st, buf, buflen); duke@435: st->cr(); duke@435: } duke@435: st->cr(); duke@435: duke@435: st->print_cr("Other Threads:"); duke@435: if (VMThread::vm_thread()) { duke@435: bool is_current = (current == VMThread::vm_thread()); duke@435: found_current = found_current || is_current; duke@435: st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); duke@435: duke@435: st->print(PTR_FORMAT, VMThread::vm_thread()); duke@435: st->print(" "); duke@435: VMThread::vm_thread()->print_on_error(st, buf, buflen); duke@435: st->cr(); duke@435: } duke@435: WatcherThread* wt = WatcherThread::watcher_thread(); duke@435: if (wt != NULL) { duke@435: bool is_current = (current == wt); duke@435: found_current = found_current || is_current; duke@435: st->print("%s", is_current ? "=>" : " "); duke@435: duke@435: st->print(PTR_FORMAT, wt); duke@435: st->print(" "); duke@435: wt->print_on_error(st, buf, buflen); duke@435: st->cr(); duke@435: } duke@435: if (!found_current) { duke@435: st->cr(); duke@435: st->print("=>" PTR_FORMAT " (exited) ", current); duke@435: current->print_on_error(st, buf, buflen); duke@435: st->cr(); duke@435: } duke@435: } duke@435: acorn@2233: // Internal SpinLock and Mutex acorn@2233: // Based on ParkEvent acorn@2233: acorn@2233: // Ad-hoc mutual exclusion primitives: SpinLock and Mux duke@435: // acorn@2233: // We employ SpinLocks _only for low-contention, fixed-length acorn@2233: // short-duration critical sections where we're concerned acorn@2233: // about native mutex_t or HotSpot Mutex:: latency. acorn@2233: // The mux construct provides a spin-then-block mutual exclusion acorn@2233: // mechanism. duke@435: // acorn@2233: // Testing has shown that contention on the ListLock guarding gFreeList acorn@2233: // is common. If we implement ListLock as a simple SpinLock it's common acorn@2233: // for the JVM to devolve to yielding with little progress. This is true acorn@2233: // despite the fact that the critical sections protected by ListLock are acorn@2233: // extremely short. duke@435: // acorn@2233: // TODO-FIXME: ListLock should be of type SpinLock. acorn@2233: // We should make this a 1st-class type, integrated into the lock acorn@2233: // hierarchy as leaf-locks. Critically, the SpinLock structure acorn@2233: // should have sufficient padding to avoid false-sharing and excessive acorn@2233: // cache-coherency traffic. acorn@2233: acorn@2233: acorn@2233: typedef volatile int SpinLockT ; acorn@2233: acorn@2233: void Thread::SpinAcquire (volatile int * adr, const char * LockName) { acorn@2233: if (Atomic::cmpxchg (1, adr, 0) == 0) { acorn@2233: return ; // normal fast-path return acorn@2233: } acorn@2233: acorn@2233: // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. acorn@2233: TEVENT (SpinAcquire - ctx) ; acorn@2233: int ctr = 0 ; acorn@2233: int Yields = 0 ; duke@435: for (;;) { acorn@2233: while (*adr != 0) { acorn@2233: ++ctr ; acorn@2233: if ((ctr & 0xFFF) == 0 || !os::is_MP()) { acorn@2233: if (Yields > 5) { acorn@2233: // Consider using a simple NakedSleep() instead. acorn@2233: // Then SpinAcquire could be called by non-JVM threads acorn@2233: Thread::current()->_ParkEvent->park(1) ; acorn@2233: } else { acorn@2233: os::NakedYield() ; acorn@2233: ++Yields ; acorn@2233: } acorn@2233: } else { acorn@2233: SpinPause() ; duke@435: } acorn@2233: } acorn@2233: if (Atomic::cmpxchg (1, adr, 0) == 0) return ; duke@435: } duke@435: } duke@435: acorn@2233: void Thread::SpinRelease (volatile int * adr) { acorn@2233: assert (*adr != 0, "invariant") ; acorn@2233: OrderAccess::fence() ; // guarantee at least release consistency. acorn@2233: // Roach-motel semantics. acorn@2233: // It's safe if subsequent LDs and STs float "up" into the critical section, acorn@2233: // but prior LDs and STs within the critical section can't be allowed acorn@2233: // to reorder or float past the ST that releases the lock. acorn@2233: *adr = 0 ; duke@435: } duke@435: acorn@2233: // muxAcquire and muxRelease: acorn@2233: // acorn@2233: // * muxAcquire and muxRelease support a single-word lock-word construct. acorn@2233: // The LSB of the word is set IFF the lock is held. acorn@2233: // The remainder of the word points to the head of a singly-linked list acorn@2233: // of threads blocked on the lock. acorn@2233: // acorn@2233: // * The current implementation of muxAcquire-muxRelease uses its own acorn@2233: // dedicated Thread._MuxEvent instance. If we're interested in acorn@2233: // minimizing the peak number of extant ParkEvent instances then acorn@2233: // we could eliminate _MuxEvent and "borrow" _ParkEvent as long acorn@2233: // as certain invariants were satisfied. Specifically, care would need acorn@2233: // to be taken with regards to consuming unpark() "permits". acorn@2233: // A safe rule of thumb is that a thread would never call muxAcquire() acorn@2233: // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently acorn@2233: // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could acorn@2233: // consume an unpark() permit intended for monitorenter, for instance. acorn@2233: // One way around this would be to widen the restricted-range semaphore acorn@2233: // implemented in park(). Another alternative would be to provide acorn@2233: // multiple instances of the PlatformEvent() for each thread. One acorn@2233: // instance would be dedicated to muxAcquire-muxRelease, for instance. acorn@2233: // acorn@2233: // * Usage: acorn@2233: // -- Only as leaf locks acorn@2233: // -- for short-term locking only as muxAcquire does not perform acorn@2233: // thread state transitions. acorn@2233: // acorn@2233: // Alternatives: acorn@2233: // * We could implement muxAcquire and muxRelease with MCS or CLH locks acorn@2233: // but with parking or spin-then-park instead of pure spinning. acorn@2233: // * Use Taura-Oyama-Yonenzawa locks. acorn@2233: // * It's possible to construct a 1-0 lock if we encode the lockword as acorn@2233: // (List,LockByte). Acquire will CAS the full lockword while Release acorn@2233: // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so acorn@2233: // acquiring threads use timers (ParkTimed) to detect and recover from acorn@2233: // the stranding window. Thread/Node structures must be aligned on 256-byte acorn@2233: // boundaries by using placement-new. acorn@2233: // * Augment MCS with advisory back-link fields maintained with CAS(). acorn@2233: // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. acorn@2233: // The validity of the backlinks must be ratified before we trust the value. acorn@2233: // If the backlinks are invalid the exiting thread must back-track through the acorn@2233: // the forward links, which are always trustworthy. acorn@2233: // * Add a successor indication. The LockWord is currently encoded as acorn@2233: // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable acorn@2233: // to provide the usual futile-wakeup optimization. acorn@2233: // See RTStt for details. acorn@2233: // * Consider schedctl.sc_nopreempt to cover the critical section. acorn@2233: // acorn@2233: acorn@2233: acorn@2233: typedef volatile intptr_t MutexT ; // Mux Lock-word acorn@2233: enum MuxBits { LOCKBIT = 1 } ; acorn@2233: acorn@2233: void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { acorn@2233: intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; acorn@2233: if (w == 0) return ; acorn@2233: if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: return ; acorn@2233: } acorn@2233: acorn@2233: TEVENT (muxAcquire - Contention) ; acorn@2233: ParkEvent * const Self = Thread::current()->_MuxEvent ; acorn@2233: assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; duke@435: for (;;) { acorn@2233: int its = (os::is_MP() ? 100 : 0) + 1 ; acorn@2233: acorn@2233: // Optional spin phase: spin-then-park strategy acorn@2233: while (--its >= 0) { acorn@2233: w = *Lock ; acorn@2233: if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: return ; acorn@2233: } acorn@2233: } acorn@2233: acorn@2233: Self->reset() ; acorn@2233: Self->OnList = intptr_t(Lock) ; acorn@2233: // The following fence() isn't _strictly necessary as the subsequent acorn@2233: // CAS() both serializes execution and ratifies the fetched *Lock value. acorn@2233: OrderAccess::fence(); acorn@2233: for (;;) { acorn@2233: w = *Lock ; acorn@2233: if ((w & LOCKBIT) == 0) { acorn@2233: if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: Self->OnList = 0 ; // hygiene - allows stronger asserts acorn@2233: return ; acorn@2233: } acorn@2233: continue ; // Interference -- *Lock changed -- Just retry duke@435: } acorn@2233: assert (w & LOCKBIT, "invariant") ; acorn@2233: Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); acorn@2233: if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; acorn@2233: } acorn@2233: acorn@2233: while (Self->OnList != 0) { acorn@2233: Self->park() ; acorn@2233: } duke@435: } duke@435: } duke@435: acorn@2233: void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { acorn@2233: intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; acorn@2233: if (w == 0) return ; acorn@2233: if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: return ; acorn@2233: } acorn@2233: acorn@2233: TEVENT (muxAcquire - Contention) ; acorn@2233: ParkEvent * ReleaseAfter = NULL ; acorn@2233: if (ev == NULL) { acorn@2233: ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; acorn@2233: } acorn@2233: assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; acorn@2233: for (;;) { acorn@2233: guarantee (ev->OnList == 0, "invariant") ; acorn@2233: int its = (os::is_MP() ? 100 : 0) + 1 ; acorn@2233: acorn@2233: // Optional spin phase: spin-then-park strategy acorn@2233: while (--its >= 0) { acorn@2233: w = *Lock ; acorn@2233: if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: if (ReleaseAfter != NULL) { acorn@2233: ParkEvent::Release (ReleaseAfter) ; acorn@2233: } acorn@2233: return ; acorn@2233: } acorn@2233: } acorn@2233: acorn@2233: ev->reset() ; acorn@2233: ev->OnList = intptr_t(Lock) ; acorn@2233: // The following fence() isn't _strictly necessary as the subsequent acorn@2233: // CAS() both serializes execution and ratifies the fetched *Lock value. acorn@2233: OrderAccess::fence(); acorn@2233: for (;;) { acorn@2233: w = *Lock ; acorn@2233: if ((w & LOCKBIT) == 0) { acorn@2233: if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { acorn@2233: ev->OnList = 0 ; acorn@2233: // We call ::Release while holding the outer lock, thus acorn@2233: // artificially lengthening the critical section. acorn@2233: // Consider deferring the ::Release() until the subsequent unlock(), acorn@2233: // after we've dropped the outer lock. acorn@2233: if (ReleaseAfter != NULL) { acorn@2233: ParkEvent::Release (ReleaseAfter) ; acorn@2233: } acorn@2233: return ; acorn@2233: } acorn@2233: continue ; // Interference -- *Lock changed -- Just retry acorn@2233: } acorn@2233: assert (w & LOCKBIT, "invariant") ; acorn@2233: ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); acorn@2233: if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; acorn@2233: } acorn@2233: acorn@2233: while (ev->OnList != 0) { acorn@2233: ev->park() ; acorn@2233: } acorn@2233: } acorn@2233: } acorn@2233: acorn@2233: // Release() must extract a successor from the list and then wake that thread. acorn@2233: // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme acorn@2233: // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based acorn@2233: // Release() would : acorn@2233: // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. acorn@2233: // (B) Extract a successor from the private list "in-hand" acorn@2233: // (C) attempt to CAS() the residual back into *Lock over null. acorn@2233: // If there were any newly arrived threads and the CAS() would fail. acorn@2233: // In that case Release() would detach the RATs, re-merge the list in-hand acorn@2233: // with the RATs and repeat as needed. Alternately, Release() might acorn@2233: // detach and extract a successor, but then pass the residual list to the wakee. acorn@2233: // The wakee would be responsible for reattaching and remerging before it acorn@2233: // competed for the lock. acorn@2233: // acorn@2233: // Both "pop" and DMR are immune from ABA corruption -- there can be acorn@2233: // multiple concurrent pushers, but only one popper or detacher. acorn@2233: // This implementation pops from the head of the list. This is unfair, acorn@2233: // but tends to provide excellent throughput as hot threads remain hot. acorn@2233: // (We wake recently run threads first). acorn@2233: acorn@2233: void Thread::muxRelease (volatile intptr_t * Lock) { acorn@2233: for (;;) { acorn@2233: const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; acorn@2233: assert (w & LOCKBIT, "invariant") ; acorn@2233: if (w == LOCKBIT) return ; acorn@2233: ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; acorn@2233: assert (List != NULL, "invariant") ; acorn@2233: assert (List->OnList == intptr_t(Lock), "invariant") ; acorn@2233: ParkEvent * nxt = List->ListNext ; acorn@2233: acorn@2233: // The following CAS() releases the lock and pops the head element. acorn@2233: if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { acorn@2233: continue ; acorn@2233: } acorn@2233: List->OnList = 0 ; acorn@2233: OrderAccess::fence() ; acorn@2233: List->unpark () ; acorn@2233: return ; acorn@2233: } acorn@2233: } acorn@2233: acorn@2233: duke@435: void Threads::verify() { duke@435: ALL_JAVA_THREADS(p) { duke@435: p->verify(); duke@435: } duke@435: VMThread* thread = VMThread::vm_thread(); duke@435: if (thread != NULL) thread->verify(); duke@435: }