Tue, 17 Oct 2017 12:58:25 +0800
merge
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #include "precompiled.hpp" |
aoqi@0 | 26 | #include "prims/jvmtiRawMonitor.hpp" |
aoqi@0 | 27 | #include "runtime/interfaceSupport.hpp" |
goetz@6911 | 28 | #include "runtime/orderAccess.inline.hpp" |
goetz@6911 | 29 | #include "runtime/thread.inline.hpp" |
aoqi@0 | 30 | |
aoqi@0 | 31 | GrowableArray<JvmtiRawMonitor*> *JvmtiPendingMonitors::_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JvmtiRawMonitor*>(1,true); |
aoqi@0 | 32 | |
aoqi@0 | 33 | void JvmtiPendingMonitors::transition_raw_monitors() { |
aoqi@0 | 34 | assert((Threads::number_of_threads()==1), |
aoqi@0 | 35 | "Java thread has not created yet or more than one java thread \ |
aoqi@0 | 36 | is running. Raw monitor transition will not work"); |
aoqi@0 | 37 | JavaThread *current_java_thread = JavaThread::current(); |
aoqi@0 | 38 | assert(current_java_thread->thread_state() == _thread_in_vm, "Must be in vm"); |
aoqi@0 | 39 | { |
aoqi@0 | 40 | ThreadBlockInVM __tbivm(current_java_thread); |
aoqi@0 | 41 | for(int i=0; i< count(); i++) { |
aoqi@0 | 42 | JvmtiRawMonitor *rmonitor = monitors()->at(i); |
aoqi@0 | 43 | int r = rmonitor->raw_enter(current_java_thread); |
aoqi@0 | 44 | assert(r == ObjectMonitor::OM_OK, "raw_enter should have worked"); |
aoqi@0 | 45 | } |
aoqi@0 | 46 | } |
aoqi@0 | 47 | // pending monitors are converted to real monitor so delete them all. |
aoqi@0 | 48 | dispose(); |
aoqi@0 | 49 | } |
aoqi@0 | 50 | |
aoqi@0 | 51 | // |
aoqi@0 | 52 | // class JvmtiRawMonitor |
aoqi@0 | 53 | // |
aoqi@0 | 54 | |
aoqi@0 | 55 | JvmtiRawMonitor::JvmtiRawMonitor(const char *name) { |
aoqi@0 | 56 | #ifdef ASSERT |
aoqi@0 | 57 | _name = strcpy(NEW_C_HEAP_ARRAY(char, strlen(name) + 1, mtInternal), name); |
aoqi@0 | 58 | #else |
aoqi@0 | 59 | _name = NULL; |
aoqi@0 | 60 | #endif |
aoqi@0 | 61 | _magic = JVMTI_RM_MAGIC; |
aoqi@0 | 62 | } |
aoqi@0 | 63 | |
aoqi@0 | 64 | JvmtiRawMonitor::~JvmtiRawMonitor() { |
aoqi@0 | 65 | #ifdef ASSERT |
aoqi@0 | 66 | FreeHeap(_name); |
aoqi@0 | 67 | #endif |
aoqi@0 | 68 | _magic = 0; |
aoqi@0 | 69 | } |
aoqi@0 | 70 | |
aoqi@0 | 71 | |
aoqi@0 | 72 | bool |
aoqi@0 | 73 | JvmtiRawMonitor::is_valid() { |
aoqi@0 | 74 | int value = 0; |
aoqi@0 | 75 | |
aoqi@0 | 76 | // This object might not be a JvmtiRawMonitor so we can't assume |
aoqi@0 | 77 | // the _magic field is properly aligned. Get the value in a safe |
aoqi@0 | 78 | // way and then check against JVMTI_RM_MAGIC. |
aoqi@0 | 79 | |
aoqi@0 | 80 | switch (sizeof(_magic)) { |
aoqi@0 | 81 | case 2: |
aoqi@0 | 82 | value = Bytes::get_native_u2((address)&_magic); |
aoqi@0 | 83 | break; |
aoqi@0 | 84 | |
aoqi@0 | 85 | case 4: |
aoqi@0 | 86 | value = Bytes::get_native_u4((address)&_magic); |
aoqi@0 | 87 | break; |
aoqi@0 | 88 | |
aoqi@0 | 89 | case 8: |
aoqi@0 | 90 | value = Bytes::get_native_u8((address)&_magic); |
aoqi@0 | 91 | break; |
aoqi@0 | 92 | |
aoqi@0 | 93 | default: |
aoqi@0 | 94 | guarantee(false, "_magic field is an unexpected size"); |
aoqi@0 | 95 | } |
aoqi@0 | 96 | |
aoqi@0 | 97 | return value == JVMTI_RM_MAGIC; |
aoqi@0 | 98 | } |
aoqi@0 | 99 | |
aoqi@0 | 100 | // ------------------------------------------------------------------------- |
aoqi@0 | 101 | // The raw monitor subsystem is entirely distinct from normal |
aoqi@0 | 102 | // java-synchronization or jni-synchronization. raw monitors are not |
aoqi@0 | 103 | // associated with objects. They can be implemented in any manner |
aoqi@0 | 104 | // that makes sense. The original implementors decided to piggy-back |
aoqi@0 | 105 | // the raw-monitor implementation on the existing Java objectMonitor mechanism. |
aoqi@0 | 106 | // This flaw needs to fixed. We should reimplement raw monitors as sui-generis. |
aoqi@0 | 107 | // Specifically, we should not implement raw monitors via java monitors. |
aoqi@0 | 108 | // Time permitting, we should disentangle and deconvolve the two implementations |
aoqi@0 | 109 | // and move the resulting raw monitor implementation over to the JVMTI directories. |
aoqi@0 | 110 | // Ideally, the raw monitor implementation would be built on top of |
aoqi@0 | 111 | // park-unpark and nothing else. |
aoqi@0 | 112 | // |
aoqi@0 | 113 | // raw monitors are used mainly by JVMTI |
aoqi@0 | 114 | // The raw monitor implementation borrows the ObjectMonitor structure, |
aoqi@0 | 115 | // but the operators are degenerate and extremely simple. |
aoqi@0 | 116 | // |
aoqi@0 | 117 | // Mixed use of a single objectMonitor instance -- as both a raw monitor |
aoqi@0 | 118 | // and a normal java monitor -- is not permissible. |
aoqi@0 | 119 | // |
aoqi@0 | 120 | // Note that we use the single RawMonitor_lock to protect queue operations for |
aoqi@0 | 121 | // _all_ raw monitors. This is a scalability impediment, but since raw monitor usage |
aoqi@0 | 122 | // is deprecated and rare, this is not of concern. The RawMonitor_lock can not |
aoqi@0 | 123 | // be held indefinitely. The critical sections must be short and bounded. |
aoqi@0 | 124 | // |
aoqi@0 | 125 | // ------------------------------------------------------------------------- |
aoqi@0 | 126 | |
aoqi@0 | 127 | int JvmtiRawMonitor::SimpleEnter (Thread * Self) { |
aoqi@0 | 128 | for (;;) { |
aoqi@0 | 129 | if (Atomic::cmpxchg_ptr (Self, &_owner, NULL) == NULL) { |
aoqi@0 | 130 | return OS_OK ; |
aoqi@0 | 131 | } |
aoqi@0 | 132 | |
aoqi@0 | 133 | ObjectWaiter Node (Self) ; |
aoqi@0 | 134 | Self->_ParkEvent->reset() ; // strictly optional |
aoqi@0 | 135 | Node.TState = ObjectWaiter::TS_ENTER ; |
aoqi@0 | 136 | |
aoqi@0 | 137 | RawMonitor_lock->lock_without_safepoint_check() ; |
aoqi@0 | 138 | Node._next = _EntryList ; |
aoqi@0 | 139 | _EntryList = &Node ; |
aoqi@0 | 140 | OrderAccess::fence() ; |
aoqi@0 | 141 | if (_owner == NULL && Atomic::cmpxchg_ptr (Self, &_owner, NULL) == NULL) { |
aoqi@0 | 142 | _EntryList = Node._next ; |
aoqi@0 | 143 | RawMonitor_lock->unlock() ; |
aoqi@0 | 144 | return OS_OK ; |
aoqi@0 | 145 | } |
aoqi@0 | 146 | RawMonitor_lock->unlock() ; |
aoqi@0 | 147 | while (Node.TState == ObjectWaiter::TS_ENTER) { |
aoqi@0 | 148 | Self->_ParkEvent->park() ; |
aoqi@0 | 149 | } |
aoqi@0 | 150 | } |
aoqi@0 | 151 | } |
aoqi@0 | 152 | |
aoqi@0 | 153 | int JvmtiRawMonitor::SimpleExit (Thread * Self) { |
aoqi@0 | 154 | guarantee (_owner == Self, "invariant") ; |
aoqi@0 | 155 | OrderAccess::release_store_ptr (&_owner, NULL) ; |
aoqi@0 | 156 | OrderAccess::fence() ; |
aoqi@0 | 157 | if (_EntryList == NULL) return OS_OK ; |
aoqi@0 | 158 | ObjectWaiter * w ; |
aoqi@0 | 159 | |
aoqi@0 | 160 | RawMonitor_lock->lock_without_safepoint_check() ; |
aoqi@0 | 161 | w = _EntryList ; |
aoqi@0 | 162 | if (w != NULL) { |
aoqi@0 | 163 | _EntryList = w->_next ; |
aoqi@0 | 164 | } |
aoqi@0 | 165 | RawMonitor_lock->unlock() ; |
aoqi@0 | 166 | if (w != NULL) { |
aoqi@0 | 167 | guarantee (w ->TState == ObjectWaiter::TS_ENTER, "invariant") ; |
aoqi@0 | 168 | ParkEvent * ev = w->_event ; |
aoqi@0 | 169 | w->TState = ObjectWaiter::TS_RUN ; |
aoqi@0 | 170 | OrderAccess::fence() ; |
aoqi@0 | 171 | ev->unpark() ; |
aoqi@0 | 172 | } |
aoqi@0 | 173 | return OS_OK ; |
aoqi@0 | 174 | } |
aoqi@0 | 175 | |
aoqi@0 | 176 | int JvmtiRawMonitor::SimpleWait (Thread * Self, jlong millis) { |
aoqi@0 | 177 | guarantee (_owner == Self , "invariant") ; |
aoqi@0 | 178 | guarantee (_recursions == 0, "invariant") ; |
aoqi@0 | 179 | |
aoqi@0 | 180 | ObjectWaiter Node (Self) ; |
aoqi@0 | 181 | Node._notified = 0 ; |
aoqi@0 | 182 | Node.TState = ObjectWaiter::TS_WAIT ; |
aoqi@0 | 183 | |
aoqi@0 | 184 | RawMonitor_lock->lock_without_safepoint_check() ; |
aoqi@0 | 185 | Node._next = _WaitSet ; |
aoqi@0 | 186 | _WaitSet = &Node ; |
aoqi@0 | 187 | RawMonitor_lock->unlock() ; |
aoqi@0 | 188 | |
aoqi@0 | 189 | SimpleExit (Self) ; |
aoqi@0 | 190 | guarantee (_owner != Self, "invariant") ; |
aoqi@0 | 191 | |
aoqi@0 | 192 | int ret = OS_OK ; |
aoqi@0 | 193 | if (millis <= 0) { |
aoqi@0 | 194 | Self->_ParkEvent->park(); |
aoqi@0 | 195 | } else { |
aoqi@0 | 196 | ret = Self->_ParkEvent->park(millis); |
aoqi@0 | 197 | } |
aoqi@0 | 198 | |
aoqi@0 | 199 | // If thread still resides on the waitset then unlink it. |
aoqi@0 | 200 | // Double-checked locking -- the usage is safe in this context |
aoqi@0 | 201 | // as we TState is volatile and the lock-unlock operators are |
aoqi@0 | 202 | // serializing (barrier-equivalent). |
aoqi@0 | 203 | |
aoqi@0 | 204 | if (Node.TState == ObjectWaiter::TS_WAIT) { |
aoqi@0 | 205 | RawMonitor_lock->lock_without_safepoint_check() ; |
aoqi@0 | 206 | if (Node.TState == ObjectWaiter::TS_WAIT) { |
aoqi@0 | 207 | // Simple O(n) unlink, but performance isn't critical here. |
aoqi@0 | 208 | ObjectWaiter * p ; |
aoqi@0 | 209 | ObjectWaiter * q = NULL ; |
aoqi@0 | 210 | for (p = _WaitSet ; p != &Node; p = p->_next) { |
aoqi@0 | 211 | q = p ; |
aoqi@0 | 212 | } |
aoqi@0 | 213 | guarantee (p == &Node, "invariant") ; |
aoqi@0 | 214 | if (q == NULL) { |
aoqi@0 | 215 | guarantee (p == _WaitSet, "invariant") ; |
aoqi@0 | 216 | _WaitSet = p->_next ; |
aoqi@0 | 217 | } else { |
aoqi@0 | 218 | guarantee (p == q->_next, "invariant") ; |
aoqi@0 | 219 | q->_next = p->_next ; |
aoqi@0 | 220 | } |
aoqi@0 | 221 | Node.TState = ObjectWaiter::TS_RUN ; |
aoqi@0 | 222 | } |
aoqi@0 | 223 | RawMonitor_lock->unlock() ; |
aoqi@0 | 224 | } |
aoqi@0 | 225 | |
aoqi@0 | 226 | guarantee (Node.TState == ObjectWaiter::TS_RUN, "invariant") ; |
aoqi@0 | 227 | SimpleEnter (Self) ; |
aoqi@0 | 228 | |
aoqi@0 | 229 | guarantee (_owner == Self, "invariant") ; |
aoqi@0 | 230 | guarantee (_recursions == 0, "invariant") ; |
aoqi@0 | 231 | return ret ; |
aoqi@0 | 232 | } |
aoqi@0 | 233 | |
aoqi@0 | 234 | int JvmtiRawMonitor::SimpleNotify (Thread * Self, bool All) { |
aoqi@0 | 235 | guarantee (_owner == Self, "invariant") ; |
aoqi@0 | 236 | if (_WaitSet == NULL) return OS_OK ; |
aoqi@0 | 237 | |
aoqi@0 | 238 | // We have two options: |
aoqi@0 | 239 | // A. Transfer the threads from the WaitSet to the EntryList |
aoqi@0 | 240 | // B. Remove the thread from the WaitSet and unpark() it. |
aoqi@0 | 241 | // |
aoqi@0 | 242 | // We use (B), which is crude and results in lots of futile |
aoqi@0 | 243 | // context switching. In particular (B) induces lots of contention. |
aoqi@0 | 244 | |
aoqi@0 | 245 | ParkEvent * ev = NULL ; // consider using a small auto array ... |
aoqi@0 | 246 | RawMonitor_lock->lock_without_safepoint_check() ; |
aoqi@0 | 247 | for (;;) { |
aoqi@0 | 248 | ObjectWaiter * w = _WaitSet ; |
aoqi@0 | 249 | if (w == NULL) break ; |
aoqi@0 | 250 | _WaitSet = w->_next ; |
aoqi@0 | 251 | if (ev != NULL) { ev->unpark(); ev = NULL; } |
aoqi@0 | 252 | ev = w->_event ; |
aoqi@0 | 253 | OrderAccess::loadstore() ; |
aoqi@0 | 254 | w->TState = ObjectWaiter::TS_RUN ; |
aoqi@0 | 255 | OrderAccess::storeload(); |
aoqi@0 | 256 | if (!All) break ; |
aoqi@0 | 257 | } |
aoqi@0 | 258 | RawMonitor_lock->unlock() ; |
aoqi@0 | 259 | if (ev != NULL) ev->unpark(); |
aoqi@0 | 260 | return OS_OK ; |
aoqi@0 | 261 | } |
aoqi@0 | 262 | |
aoqi@0 | 263 | // Any JavaThread will enter here with state _thread_blocked |
aoqi@0 | 264 | int JvmtiRawMonitor::raw_enter(TRAPS) { |
aoqi@0 | 265 | TEVENT (raw_enter) ; |
aoqi@0 | 266 | void * Contended ; |
aoqi@0 | 267 | |
aoqi@0 | 268 | // don't enter raw monitor if thread is being externally suspended, it will |
aoqi@0 | 269 | // surprise the suspender if a "suspended" thread can still enter monitor |
aoqi@0 | 270 | JavaThread * jt = (JavaThread *)THREAD; |
aoqi@0 | 271 | if (THREAD->is_Java_thread()) { |
aoqi@0 | 272 | jt->SR_lock()->lock_without_safepoint_check(); |
aoqi@0 | 273 | while (jt->is_external_suspend()) { |
aoqi@0 | 274 | jt->SR_lock()->unlock(); |
aoqi@0 | 275 | jt->java_suspend_self(); |
aoqi@0 | 276 | jt->SR_lock()->lock_without_safepoint_check(); |
aoqi@0 | 277 | } |
aoqi@0 | 278 | // guarded by SR_lock to avoid racing with new external suspend requests. |
aoqi@0 | 279 | Contended = Atomic::cmpxchg_ptr (THREAD, &_owner, NULL) ; |
aoqi@0 | 280 | jt->SR_lock()->unlock(); |
aoqi@0 | 281 | } else { |
aoqi@0 | 282 | Contended = Atomic::cmpxchg_ptr (THREAD, &_owner, NULL) ; |
aoqi@0 | 283 | } |
aoqi@0 | 284 | |
aoqi@0 | 285 | if (Contended == THREAD) { |
aoqi@0 | 286 | _recursions ++ ; |
aoqi@0 | 287 | return OM_OK ; |
aoqi@0 | 288 | } |
aoqi@0 | 289 | |
aoqi@0 | 290 | if (Contended == NULL) { |
aoqi@0 | 291 | guarantee (_owner == THREAD, "invariant") ; |
aoqi@0 | 292 | guarantee (_recursions == 0, "invariant") ; |
aoqi@0 | 293 | return OM_OK ; |
aoqi@0 | 294 | } |
aoqi@0 | 295 | |
aoqi@0 | 296 | THREAD->set_current_pending_monitor(this); |
aoqi@0 | 297 | |
aoqi@0 | 298 | if (!THREAD->is_Java_thread()) { |
aoqi@0 | 299 | // No other non-Java threads besides VM thread would acquire |
aoqi@0 | 300 | // a raw monitor. |
aoqi@0 | 301 | assert(THREAD->is_VM_thread(), "must be VM thread"); |
aoqi@0 | 302 | SimpleEnter (THREAD) ; |
aoqi@0 | 303 | } else { |
aoqi@0 | 304 | guarantee (jt->thread_state() == _thread_blocked, "invariant") ; |
aoqi@0 | 305 | for (;;) { |
aoqi@0 | 306 | jt->set_suspend_equivalent(); |
aoqi@0 | 307 | // cleared by handle_special_suspend_equivalent_condition() or |
aoqi@0 | 308 | // java_suspend_self() |
aoqi@0 | 309 | SimpleEnter (THREAD) ; |
aoqi@0 | 310 | |
aoqi@0 | 311 | // were we externally suspended while we were waiting? |
aoqi@0 | 312 | if (!jt->handle_special_suspend_equivalent_condition()) break ; |
aoqi@0 | 313 | |
aoqi@0 | 314 | // This thread was externally suspended |
aoqi@0 | 315 | // |
aoqi@0 | 316 | // This logic isn't needed for JVMTI raw monitors, |
aoqi@0 | 317 | // but doesn't hurt just in case the suspend rules change. This |
aoqi@0 | 318 | // logic is needed for the JvmtiRawMonitor.wait() reentry phase. |
aoqi@0 | 319 | // We have reentered the contended monitor, but while we were |
aoqi@0 | 320 | // waiting another thread suspended us. We don't want to reenter |
aoqi@0 | 321 | // the monitor while suspended because that would surprise the |
aoqi@0 | 322 | // thread that suspended us. |
aoqi@0 | 323 | // |
aoqi@0 | 324 | // Drop the lock - |
aoqi@0 | 325 | SimpleExit (THREAD) ; |
aoqi@0 | 326 | |
aoqi@0 | 327 | jt->java_suspend_self(); |
aoqi@0 | 328 | } |
aoqi@0 | 329 | |
aoqi@0 | 330 | assert(_owner == THREAD, "Fatal error with monitor owner!"); |
aoqi@0 | 331 | assert(_recursions == 0, "Fatal error with monitor recursions!"); |
aoqi@0 | 332 | } |
aoqi@0 | 333 | |
aoqi@0 | 334 | THREAD->set_current_pending_monitor(NULL); |
aoqi@0 | 335 | guarantee (_recursions == 0, "invariant") ; |
aoqi@0 | 336 | return OM_OK; |
aoqi@0 | 337 | } |
aoqi@0 | 338 | |
aoqi@0 | 339 | // Used mainly for JVMTI raw monitor implementation |
aoqi@0 | 340 | // Also used for JvmtiRawMonitor::wait(). |
aoqi@0 | 341 | int JvmtiRawMonitor::raw_exit(TRAPS) { |
aoqi@0 | 342 | TEVENT (raw_exit) ; |
aoqi@0 | 343 | if (THREAD != _owner) { |
aoqi@0 | 344 | return OM_ILLEGAL_MONITOR_STATE; |
aoqi@0 | 345 | } |
aoqi@0 | 346 | if (_recursions > 0) { |
aoqi@0 | 347 | --_recursions ; |
aoqi@0 | 348 | return OM_OK ; |
aoqi@0 | 349 | } |
aoqi@0 | 350 | |
aoqi@0 | 351 | void * List = _EntryList ; |
aoqi@0 | 352 | SimpleExit (THREAD) ; |
aoqi@0 | 353 | |
aoqi@0 | 354 | return OM_OK; |
aoqi@0 | 355 | } |
aoqi@0 | 356 | |
aoqi@0 | 357 | // Used for JVMTI raw monitor implementation. |
aoqi@0 | 358 | // All JavaThreads will enter here with state _thread_blocked |
aoqi@0 | 359 | |
aoqi@0 | 360 | int JvmtiRawMonitor::raw_wait(jlong millis, bool interruptible, TRAPS) { |
aoqi@0 | 361 | TEVENT (raw_wait) ; |
aoqi@0 | 362 | if (THREAD != _owner) { |
aoqi@0 | 363 | return OM_ILLEGAL_MONITOR_STATE; |
aoqi@0 | 364 | } |
aoqi@0 | 365 | |
aoqi@0 | 366 | // To avoid spurious wakeups we reset the parkevent -- This is strictly optional. |
aoqi@0 | 367 | // The caller must be able to tolerate spurious returns from raw_wait(). |
aoqi@0 | 368 | THREAD->_ParkEvent->reset() ; |
aoqi@0 | 369 | OrderAccess::fence() ; |
aoqi@0 | 370 | |
aoqi@0 | 371 | // check interrupt event |
aoqi@0 | 372 | if (interruptible && Thread::is_interrupted(THREAD, true)) { |
aoqi@0 | 373 | return OM_INTERRUPTED; |
aoqi@0 | 374 | } |
aoqi@0 | 375 | |
aoqi@0 | 376 | intptr_t save = _recursions ; |
aoqi@0 | 377 | _recursions = 0 ; |
aoqi@0 | 378 | _waiters ++ ; |
aoqi@0 | 379 | if (THREAD->is_Java_thread()) { |
aoqi@0 | 380 | guarantee (((JavaThread *) THREAD)->thread_state() == _thread_blocked, "invariant") ; |
aoqi@0 | 381 | ((JavaThread *)THREAD)->set_suspend_equivalent(); |
aoqi@0 | 382 | } |
aoqi@0 | 383 | int rv = SimpleWait (THREAD, millis) ; |
aoqi@0 | 384 | _recursions = save ; |
aoqi@0 | 385 | _waiters -- ; |
aoqi@0 | 386 | |
aoqi@0 | 387 | guarantee (THREAD == _owner, "invariant") ; |
aoqi@0 | 388 | if (THREAD->is_Java_thread()) { |
aoqi@0 | 389 | JavaThread * jSelf = (JavaThread *) THREAD ; |
aoqi@0 | 390 | for (;;) { |
aoqi@0 | 391 | if (!jSelf->handle_special_suspend_equivalent_condition()) break ; |
aoqi@0 | 392 | SimpleExit (THREAD) ; |
aoqi@0 | 393 | jSelf->java_suspend_self(); |
aoqi@0 | 394 | SimpleEnter (THREAD) ; |
aoqi@0 | 395 | jSelf->set_suspend_equivalent() ; |
aoqi@0 | 396 | } |
aoqi@0 | 397 | } |
aoqi@0 | 398 | guarantee (THREAD == _owner, "invariant") ; |
aoqi@0 | 399 | |
aoqi@0 | 400 | if (interruptible && Thread::is_interrupted(THREAD, true)) { |
aoqi@0 | 401 | return OM_INTERRUPTED; |
aoqi@0 | 402 | } |
aoqi@0 | 403 | return OM_OK ; |
aoqi@0 | 404 | } |
aoqi@0 | 405 | |
aoqi@0 | 406 | int JvmtiRawMonitor::raw_notify(TRAPS) { |
aoqi@0 | 407 | TEVENT (raw_notify) ; |
aoqi@0 | 408 | if (THREAD != _owner) { |
aoqi@0 | 409 | return OM_ILLEGAL_MONITOR_STATE; |
aoqi@0 | 410 | } |
aoqi@0 | 411 | SimpleNotify (THREAD, false) ; |
aoqi@0 | 412 | return OM_OK; |
aoqi@0 | 413 | } |
aoqi@0 | 414 | |
aoqi@0 | 415 | int JvmtiRawMonitor::raw_notifyAll(TRAPS) { |
aoqi@0 | 416 | TEVENT (raw_notifyAll) ; |
aoqi@0 | 417 | if (THREAD != _owner) { |
aoqi@0 | 418 | return OM_ILLEGAL_MONITOR_STATE; |
aoqi@0 | 419 | } |
aoqi@0 | 420 | SimpleNotify (THREAD, true) ; |
aoqi@0 | 421 | return OM_OK; |
aoqi@0 | 422 | } |
aoqi@0 | 423 |