Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/concurrentGCThread.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | bd02caa94611 |
| children | 6e0aac35bfa9 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 25 // CopyrightVersion 1.2 | |
| 26 | |
| 27 # include "incls/_precompiled.incl" | |
| 28 # include "incls/_concurrentGCThread.cpp.incl" | |
| 29 | |
| 30 int ConcurrentGCThread::_CGC_flag = CGC_nil; | |
| 31 | |
| 32 SuspendibleThreadSet ConcurrentGCThread::_sts; | |
| 33 | |
| 794 | 34 ConcurrentGCThread::ConcurrentGCThread() : |
| 35 _should_terminate(false), _has_terminated(false) { | |
| 342 | 36 _sts.initialize(); |
| 37 }; | |
| 38 | |
| 39 void ConcurrentGCThread::stopWorldAndDo(VoidClosure* op) { | |
| 40 MutexLockerEx x(Heap_lock, | |
| 41 Mutex::_no_safepoint_check_flag); | |
| 42 // warning("CGC: about to try stopping world"); | |
| 43 SafepointSynchronize::begin(); | |
| 44 // warning("CGC: successfully stopped world"); | |
| 45 op->do_void(); | |
| 46 SafepointSynchronize::end(); | |
| 47 // warning("CGC: successfully restarted world"); | |
| 48 } | |
| 49 | |
| 50 void ConcurrentGCThread::safepoint_synchronize() { | |
| 51 _sts.suspend_all(); | |
| 52 } | |
| 53 | |
| 54 void ConcurrentGCThread::safepoint_desynchronize() { | |
| 55 _sts.resume_all(); | |
| 56 } | |
| 57 | |
| 58 void ConcurrentGCThread::create_and_start() { | |
| 59 if (os::create_thread(this, os::cgc_thread)) { | |
| 60 // XXX: need to set this to low priority | |
| 61 // unless "agressive mode" set; priority | |
| 62 // should be just less than that of VMThread. | |
| 63 os::set_priority(this, NearMaxPriority); | |
| 64 if (!_should_terminate && !DisableStartThread) { | |
| 65 os::start_thread(this); | |
| 66 } | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 void ConcurrentGCThread::initialize_in_thread() { | |
| 71 this->record_stack_base_and_size(); | |
| 72 this->initialize_thread_local_storage(); | |
| 73 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 74 // From this time Thread::current() should be working. | |
| 75 assert(this == Thread::current(), "just checking"); | |
| 76 } | |
| 77 | |
| 78 void ConcurrentGCThread::wait_for_universe_init() { | |
| 79 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
| 80 while (!is_init_completed() && !_should_terminate) { | |
| 81 CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200); | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 void ConcurrentGCThread::terminate() { | |
| 86 // Signal that it is terminated | |
| 87 { | |
| 88 MutexLockerEx mu(Terminator_lock, | |
| 89 Mutex::_no_safepoint_check_flag); | |
| 90 _has_terminated = true; | |
| 91 Terminator_lock->notify(); | |
| 92 } | |
| 93 | |
| 94 // Thread destructor usually does this.. | |
| 95 ThreadLocalStorage::set_thread(NULL); | |
| 96 } | |
| 97 | |
| 98 | |
| 99 void SuspendibleThreadSet::initialize_work() { | |
| 100 MutexLocker x(STS_init_lock); | |
| 101 if (!_initialized) { | |
| 102 _m = new Monitor(Mutex::leaf, | |
| 103 "SuspendibleThreadSetLock", true); | |
| 104 _async = 0; | |
| 105 _async_stop = false; | |
| 106 _async_stopped = 0; | |
| 107 _initialized = true; | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 void SuspendibleThreadSet::join() { | |
| 112 initialize(); | |
| 113 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
| 114 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
| 115 _async++; | |
| 116 assert(_async > 0, "Huh."); | |
| 117 } | |
| 118 | |
| 119 void SuspendibleThreadSet::leave() { | |
| 120 assert(_initialized, "Must be initialized."); | |
| 121 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
| 122 _async--; | |
| 123 assert(_async >= 0, "Huh."); | |
| 124 if (_async_stop) _m->notify_all(); | |
| 125 } | |
| 126 | |
| 127 void SuspendibleThreadSet::yield(const char* id) { | |
| 128 assert(_initialized, "Must be initialized."); | |
| 129 if (_async_stop) { | |
| 130 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
| 131 if (_async_stop) { | |
| 132 _async_stopped++; | |
| 133 assert(_async_stopped > 0, "Huh."); | |
| 134 if (_async_stopped == _async) { | |
| 135 if (ConcGCYieldTimeout > 0) { | |
| 136 double now = os::elapsedTime(); | |
| 137 guarantee((now - _suspend_all_start) * 1000.0 < | |
| 138 (double)ConcGCYieldTimeout, | |
| 139 "Long delay; whodunit?"); | |
| 140 } | |
| 141 } | |
| 142 _m->notify_all(); | |
| 143 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
| 144 _async_stopped--; | |
| 145 assert(_async >= 0, "Huh"); | |
| 146 _m->notify_all(); | |
| 147 } | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 void SuspendibleThreadSet::suspend_all() { | |
| 152 initialize(); // If necessary. | |
| 153 if (ConcGCYieldTimeout > 0) { | |
| 154 _suspend_all_start = os::elapsedTime(); | |
| 155 } | |
| 156 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
| 157 assert(!_async_stop, "Only one at a time."); | |
| 158 _async_stop = true; | |
| 159 while (_async_stopped < _async) _m->wait(Mutex::_no_safepoint_check_flag); | |
| 160 } | |
| 161 | |
| 162 void SuspendibleThreadSet::resume_all() { | |
| 163 assert(_initialized, "Must be initialized."); | |
| 164 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
| 165 assert(_async_stopped == _async, "Huh."); | |
| 166 _async_stop = false; | |
| 167 _m->notify_all(); | |
| 168 } | |
| 169 | |
| 170 static void _sltLoop(JavaThread* thread, TRAPS) { | |
| 171 SurrogateLockerThread* slt = (SurrogateLockerThread*)thread; | |
| 172 slt->loop(); | |
| 173 } | |
| 174 | |
| 175 SurrogateLockerThread::SurrogateLockerThread() : | |
| 176 JavaThread(&_sltLoop), | |
| 177 _monitor(Mutex::nonleaf, "SLTMonitor"), | |
| 178 _buffer(empty) | |
| 179 {} | |
| 180 | |
| 181 SurrogateLockerThread* SurrogateLockerThread::make(TRAPS) { | |
| 182 klassOop k = | |
| 183 SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), | |
| 184 true, CHECK_NULL); | |
| 185 instanceKlassHandle klass (THREAD, k); | |
| 186 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 187 | |
| 188 const char thread_name[] = "Surrogate Locker Thread (CMS)"; | |
| 189 Handle string = java_lang_String::create_from_str(thread_name, CHECK_NULL); | |
| 190 | |
| 191 // Initialize thread_oop to put it into the system threadGroup | |
| 192 Handle thread_group (THREAD, Universe::system_thread_group()); | |
| 193 JavaValue result(T_VOID); | |
| 194 JavaCalls::call_special(&result, thread_oop, | |
| 195 klass, | |
| 196 vmSymbolHandles::object_initializer_name(), | |
| 197 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 198 thread_group, | |
| 199 string, | |
| 200 CHECK_NULL); | |
| 201 | |
| 202 SurrogateLockerThread* res; | |
| 203 { | |
| 204 MutexLocker mu(Threads_lock); | |
| 205 res = new SurrogateLockerThread(); | |
| 206 | |
| 207 // At this point it may be possible that no osthread was created for the | |
| 208 // JavaThread due to lack of memory. We would have to throw an exception | |
| 209 // in that case. However, since this must work and we do not allow | |
| 210 // exceptions anyway, check and abort if this fails. | |
| 211 if (res == NULL || res->osthread() == NULL) { | |
| 212 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
| 213 "unable to create new native thread"); | |
| 214 } | |
| 215 java_lang_Thread::set_thread(thread_oop(), res); | |
| 216 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
| 217 java_lang_Thread::set_daemon(thread_oop()); | |
| 218 | |
| 219 res->set_threadObj(thread_oop()); | |
| 220 Threads::add(res); | |
| 221 Thread::start(res); | |
| 222 } | |
| 223 os::yield(); // This seems to help with initial start-up of SLT | |
| 224 return res; | |
| 225 } | |
| 226 | |
| 227 void SurrogateLockerThread::manipulatePLL(SLT_msg_type msg) { | |
| 228 MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); | |
| 229 assert(_buffer == empty, "Should be empty"); | |
| 230 assert(msg != empty, "empty message"); | |
| 231 _buffer = msg; | |
| 232 while (_buffer != empty) { | |
| 233 _monitor.notify(); | |
| 234 _monitor.wait(Mutex::_no_safepoint_check_flag); | |
| 235 } | |
| 236 } | |
| 237 | |
| 238 // ======= Surrogate Locker Thread ============= | |
| 239 | |
| 240 void SurrogateLockerThread::loop() { | |
| 241 BasicLock pll_basic_lock; | |
| 242 SLT_msg_type msg; | |
| 243 debug_only(unsigned int owned = 0;) | |
| 244 | |
| 245 while (/* !isTerminated() */ 1) { | |
| 246 { | |
| 247 MutexLocker x(&_monitor); | |
| 248 // Since we are a JavaThread, we can't be here at a safepoint. | |
| 249 assert(!SafepointSynchronize::is_at_safepoint(), | |
| 250 "SLT is a JavaThread"); | |
| 251 // wait for msg buffer to become non-empty | |
| 252 while (_buffer == empty) { | |
| 253 _monitor.notify(); | |
| 254 _monitor.wait(); | |
| 255 } | |
| 256 msg = _buffer; | |
| 257 } | |
| 258 switch(msg) { | |
| 259 case acquirePLL: { | |
| 260 instanceRefKlass::acquire_pending_list_lock(&pll_basic_lock); | |
| 261 debug_only(owned++;) | |
| 262 break; | |
| 263 } | |
| 264 case releaseAndNotifyPLL: { | |
| 265 assert(owned > 0, "Don't have PLL"); | |
| 266 instanceRefKlass::release_and_notify_pending_list_lock(&pll_basic_lock); | |
| 267 debug_only(owned--;) | |
| 268 break; | |
| 269 } | |
| 270 case empty: | |
| 271 default: { | |
| 272 guarantee(false,"Unexpected message in _buffer"); | |
| 273 break; | |
| 274 } | |
| 275 } | |
| 276 { | |
| 277 MutexLocker x(&_monitor); | |
| 278 // Since we are a JavaThread, we can't be here at a safepoint. | |
| 279 assert(!SafepointSynchronize::is_at_safepoint(), | |
| 280 "SLT is a JavaThread"); | |
| 281 _buffer = empty; | |
| 282 _monitor.notify(); | |
| 283 } | |
| 284 } | |
| 285 assert(!_monitor.owned_by_self(), "Should unlock before exit."); | |
| 286 } | |
| 287 | |
| 288 | |
| 289 // ===== STS Access From Outside CGCT ===== | |
| 290 | |
| 291 void ConcurrentGCThread::stsYield(const char* id) { | |
| 292 assert( Thread::current()->is_ConcurrentGC_thread(), | |
| 293 "only a conc GC thread can call this" ); | |
| 294 _sts.yield(id); | |
| 295 } | |
| 296 | |
| 297 bool ConcurrentGCThread::stsShouldYield() { | |
| 298 assert( Thread::current()->is_ConcurrentGC_thread(), | |
| 299 "only a conc GC thread can call this" ); | |
| 300 return _sts.should_yield(); | |
| 301 } | |
| 302 | |
| 303 void ConcurrentGCThread::stsJoin() { | |
| 304 assert( Thread::current()->is_ConcurrentGC_thread(), | |
| 305 "only a conc GC thread can call this" ); | |
| 306 _sts.join(); | |
| 307 } | |
| 308 | |
| 309 void ConcurrentGCThread::stsLeave() { | |
| 310 assert( Thread::current()->is_ConcurrentGC_thread(), | |
| 311 "only a conc GC thread can call this" ); | |
| 312 _sts.leave(); | |
| 313 } |