Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/shared/concurrentGCThread.cpp @ 2370:048f98400b8e
Merge
author | jcoomes |
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date | Fri, 18 Mar 2011 09:03:43 -0700 |
parents | 3582bf76420e |
children | 1d1603768966 |
rev | line source |
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342 | 1 /* |
1972 | 2 * Copyright (c) 2001, 2010, 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 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "gc_implementation/shared/concurrentGCThread.hpp" | |
28 #include "oops/instanceRefKlass.hpp" | |
29 #include "oops/oop.inline.hpp" | |
30 #include "runtime/init.hpp" | |
31 #include "runtime/interfaceSupport.hpp" | |
32 #include "runtime/java.hpp" | |
33 #include "runtime/javaCalls.hpp" | |
342 | 34 |
1972 | 35 // CopyrightVersion 1.2 |
342 | 36 |
37 int ConcurrentGCThread::_CGC_flag = CGC_nil; | |
38 | |
39 SuspendibleThreadSet ConcurrentGCThread::_sts; | |
40 | |
794 | 41 ConcurrentGCThread::ConcurrentGCThread() : |
42 _should_terminate(false), _has_terminated(false) { | |
342 | 43 _sts.initialize(); |
44 }; | |
45 | |
46 void ConcurrentGCThread::stopWorldAndDo(VoidClosure* op) { | |
47 MutexLockerEx x(Heap_lock, | |
48 Mutex::_no_safepoint_check_flag); | |
49 // warning("CGC: about to try stopping world"); | |
50 SafepointSynchronize::begin(); | |
51 // warning("CGC: successfully stopped world"); | |
52 op->do_void(); | |
53 SafepointSynchronize::end(); | |
54 // warning("CGC: successfully restarted world"); | |
55 } | |
56 | |
57 void ConcurrentGCThread::safepoint_synchronize() { | |
58 _sts.suspend_all(); | |
59 } | |
60 | |
61 void ConcurrentGCThread::safepoint_desynchronize() { | |
62 _sts.resume_all(); | |
63 } | |
64 | |
65 void ConcurrentGCThread::create_and_start() { | |
66 if (os::create_thread(this, os::cgc_thread)) { | |
67 // XXX: need to set this to low priority | |
68 // unless "agressive mode" set; priority | |
69 // should be just less than that of VMThread. | |
70 os::set_priority(this, NearMaxPriority); | |
71 if (!_should_terminate && !DisableStartThread) { | |
72 os::start_thread(this); | |
73 } | |
74 } | |
75 } | |
76 | |
77 void ConcurrentGCThread::initialize_in_thread() { | |
78 this->record_stack_base_and_size(); | |
79 this->initialize_thread_local_storage(); | |
80 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
81 // From this time Thread::current() should be working. | |
82 assert(this == Thread::current(), "just checking"); | |
83 } | |
84 | |
85 void ConcurrentGCThread::wait_for_universe_init() { | |
86 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
87 while (!is_init_completed() && !_should_terminate) { | |
88 CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200); | |
89 } | |
90 } | |
91 | |
92 void ConcurrentGCThread::terminate() { | |
93 // Signal that it is terminated | |
94 { | |
95 MutexLockerEx mu(Terminator_lock, | |
96 Mutex::_no_safepoint_check_flag); | |
97 _has_terminated = true; | |
98 Terminator_lock->notify(); | |
99 } | |
100 | |
101 // Thread destructor usually does this.. | |
102 ThreadLocalStorage::set_thread(NULL); | |
103 } | |
104 | |
105 | |
106 void SuspendibleThreadSet::initialize_work() { | |
107 MutexLocker x(STS_init_lock); | |
108 if (!_initialized) { | |
109 _m = new Monitor(Mutex::leaf, | |
110 "SuspendibleThreadSetLock", true); | |
111 _async = 0; | |
112 _async_stop = false; | |
113 _async_stopped = 0; | |
114 _initialized = true; | |
115 } | |
116 } | |
117 | |
118 void SuspendibleThreadSet::join() { | |
119 initialize(); | |
120 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
121 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
122 _async++; | |
123 assert(_async > 0, "Huh."); | |
124 } | |
125 | |
126 void SuspendibleThreadSet::leave() { | |
127 assert(_initialized, "Must be initialized."); | |
128 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
129 _async--; | |
130 assert(_async >= 0, "Huh."); | |
131 if (_async_stop) _m->notify_all(); | |
132 } | |
133 | |
134 void SuspendibleThreadSet::yield(const char* id) { | |
135 assert(_initialized, "Must be initialized."); | |
136 if (_async_stop) { | |
137 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
138 if (_async_stop) { | |
139 _async_stopped++; | |
140 assert(_async_stopped > 0, "Huh."); | |
141 if (_async_stopped == _async) { | |
142 if (ConcGCYieldTimeout > 0) { | |
143 double now = os::elapsedTime(); | |
144 guarantee((now - _suspend_all_start) * 1000.0 < | |
145 (double)ConcGCYieldTimeout, | |
146 "Long delay; whodunit?"); | |
147 } | |
148 } | |
149 _m->notify_all(); | |
150 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
151 _async_stopped--; | |
152 assert(_async >= 0, "Huh"); | |
153 _m->notify_all(); | |
154 } | |
155 } | |
156 } | |
157 | |
158 void SuspendibleThreadSet::suspend_all() { | |
159 initialize(); // If necessary. | |
160 if (ConcGCYieldTimeout > 0) { | |
161 _suspend_all_start = os::elapsedTime(); | |
162 } | |
163 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
164 assert(!_async_stop, "Only one at a time."); | |
165 _async_stop = true; | |
166 while (_async_stopped < _async) _m->wait(Mutex::_no_safepoint_check_flag); | |
167 } | |
168 | |
169 void SuspendibleThreadSet::resume_all() { | |
170 assert(_initialized, "Must be initialized."); | |
171 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
172 assert(_async_stopped == _async, "Huh."); | |
173 _async_stop = false; | |
174 _m->notify_all(); | |
175 } | |
176 | |
177 static void _sltLoop(JavaThread* thread, TRAPS) { | |
178 SurrogateLockerThread* slt = (SurrogateLockerThread*)thread; | |
179 slt->loop(); | |
180 } | |
181 | |
182 SurrogateLockerThread::SurrogateLockerThread() : | |
183 JavaThread(&_sltLoop), | |
184 _monitor(Mutex::nonleaf, "SLTMonitor"), | |
185 _buffer(empty) | |
186 {} | |
187 | |
188 SurrogateLockerThread* SurrogateLockerThread::make(TRAPS) { | |
189 klassOop k = | |
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190 SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), |
342 | 191 true, CHECK_NULL); |
192 instanceKlassHandle klass (THREAD, k); | |
193 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
194 | |
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195 const char thread_name[] = "Surrogate Locker Thread (Concurrent GC)"; |
342 | 196 Handle string = java_lang_String::create_from_str(thread_name, CHECK_NULL); |
197 | |
198 // Initialize thread_oop to put it into the system threadGroup | |
199 Handle thread_group (THREAD, Universe::system_thread_group()); | |
200 JavaValue result(T_VOID); | |
201 JavaCalls::call_special(&result, thread_oop, | |
202 klass, | |
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203 vmSymbols::object_initializer_name(), |
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204 vmSymbols::threadgroup_string_void_signature(), |
342 | 205 thread_group, |
206 string, | |
207 CHECK_NULL); | |
208 | |
209 SurrogateLockerThread* res; | |
210 { | |
211 MutexLocker mu(Threads_lock); | |
212 res = new SurrogateLockerThread(); | |
213 | |
214 // At this point it may be possible that no osthread was created for the | |
215 // JavaThread due to lack of memory. We would have to throw an exception | |
216 // in that case. However, since this must work and we do not allow | |
217 // exceptions anyway, check and abort if this fails. | |
218 if (res == NULL || res->osthread() == NULL) { | |
219 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
220 "unable to create new native thread"); | |
221 } | |
222 java_lang_Thread::set_thread(thread_oop(), res); | |
223 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
224 java_lang_Thread::set_daemon(thread_oop()); | |
225 | |
226 res->set_threadObj(thread_oop()); | |
227 Threads::add(res); | |
228 Thread::start(res); | |
229 } | |
230 os::yield(); // This seems to help with initial start-up of SLT | |
231 return res; | |
232 } | |
233 | |
234 void SurrogateLockerThread::manipulatePLL(SLT_msg_type msg) { | |
235 MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); | |
236 assert(_buffer == empty, "Should be empty"); | |
237 assert(msg != empty, "empty message"); | |
238 _buffer = msg; | |
239 while (_buffer != empty) { | |
240 _monitor.notify(); | |
241 _monitor.wait(Mutex::_no_safepoint_check_flag); | |
242 } | |
243 } | |
244 | |
245 // ======= Surrogate Locker Thread ============= | |
246 | |
247 void SurrogateLockerThread::loop() { | |
248 BasicLock pll_basic_lock; | |
249 SLT_msg_type msg; | |
250 debug_only(unsigned int owned = 0;) | |
251 | |
252 while (/* !isTerminated() */ 1) { | |
253 { | |
254 MutexLocker x(&_monitor); | |
255 // Since we are a JavaThread, we can't be here at a safepoint. | |
256 assert(!SafepointSynchronize::is_at_safepoint(), | |
257 "SLT is a JavaThread"); | |
258 // wait for msg buffer to become non-empty | |
259 while (_buffer == empty) { | |
260 _monitor.notify(); | |
261 _monitor.wait(); | |
262 } | |
263 msg = _buffer; | |
264 } | |
265 switch(msg) { | |
266 case acquirePLL: { | |
267 instanceRefKlass::acquire_pending_list_lock(&pll_basic_lock); | |
268 debug_only(owned++;) | |
269 break; | |
270 } | |
271 case releaseAndNotifyPLL: { | |
272 assert(owned > 0, "Don't have PLL"); | |
273 instanceRefKlass::release_and_notify_pending_list_lock(&pll_basic_lock); | |
274 debug_only(owned--;) | |
275 break; | |
276 } | |
277 case empty: | |
278 default: { | |
279 guarantee(false,"Unexpected message in _buffer"); | |
280 break; | |
281 } | |
282 } | |
283 { | |
284 MutexLocker x(&_monitor); | |
285 // Since we are a JavaThread, we can't be here at a safepoint. | |
286 assert(!SafepointSynchronize::is_at_safepoint(), | |
287 "SLT is a JavaThread"); | |
288 _buffer = empty; | |
289 _monitor.notify(); | |
290 } | |
291 } | |
292 assert(!_monitor.owned_by_self(), "Should unlock before exit."); | |
293 } | |
294 | |
295 | |
296 // ===== STS Access From Outside CGCT ===== | |
297 | |
298 void ConcurrentGCThread::stsYield(const char* id) { | |
299 assert( Thread::current()->is_ConcurrentGC_thread(), | |
300 "only a conc GC thread can call this" ); | |
301 _sts.yield(id); | |
302 } | |
303 | |
304 bool ConcurrentGCThread::stsShouldYield() { | |
305 assert( Thread::current()->is_ConcurrentGC_thread(), | |
306 "only a conc GC thread can call this" ); | |
307 return _sts.should_yield(); | |
308 } | |
309 | |
310 void ConcurrentGCThread::stsJoin() { | |
311 assert( Thread::current()->is_ConcurrentGC_thread(), | |
312 "only a conc GC thread can call this" ); | |
313 _sts.join(); | |
314 } | |
315 | |
316 void ConcurrentGCThread::stsLeave() { | |
317 assert( Thread::current()->is_ConcurrentGC_thread(), | |
318 "only a conc GC thread can call this" ); | |
319 _sts.leave(); | |
320 } |