Mercurial > hg > truffle
comparison src/share/vm/gc_implementation/shared/concurrentGCThread.cpp @ 362:f8199438385b
Merge
author | apetrusenko |
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date | Wed, 17 Sep 2008 16:49:18 +0400 |
parents | 37f87013dfd8 |
children | 315a5d70b295 |
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316:5fa96a5a7e76 | 362:f8199438385b |
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1 /* | |
2 * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // CopyrightVersion 1.2 | |
26 | |
27 # include "incls/_precompiled.incl" | |
28 # include "incls/_concurrentGCThread.cpp.incl" | |
29 | |
30 bool ConcurrentGCThread::_should_terminate = false; | |
31 bool ConcurrentGCThread::_has_terminated = false; | |
32 int ConcurrentGCThread::_CGC_flag = CGC_nil; | |
33 | |
34 SuspendibleThreadSet ConcurrentGCThread::_sts; | |
35 | |
36 ConcurrentGCThread::ConcurrentGCThread() { | |
37 _sts.initialize(); | |
38 }; | |
39 | |
40 void ConcurrentGCThread::stopWorldAndDo(VoidClosure* op) { | |
41 MutexLockerEx x(Heap_lock, | |
42 Mutex::_no_safepoint_check_flag); | |
43 // warning("CGC: about to try stopping world"); | |
44 SafepointSynchronize::begin(); | |
45 // warning("CGC: successfully stopped world"); | |
46 op->do_void(); | |
47 SafepointSynchronize::end(); | |
48 // warning("CGC: successfully restarted world"); | |
49 } | |
50 | |
51 void ConcurrentGCThread::safepoint_synchronize() { | |
52 _sts.suspend_all(); | |
53 } | |
54 | |
55 void ConcurrentGCThread::safepoint_desynchronize() { | |
56 _sts.resume_all(); | |
57 } | |
58 | |
59 void ConcurrentGCThread::create_and_start() { | |
60 if (os::create_thread(this, os::cgc_thread)) { | |
61 // XXX: need to set this to low priority | |
62 // unless "agressive mode" set; priority | |
63 // should be just less than that of VMThread. | |
64 os::set_priority(this, NearMaxPriority); | |
65 if (!_should_terminate && !DisableStartThread) { | |
66 os::start_thread(this); | |
67 } | |
68 } | |
69 } | |
70 | |
71 void ConcurrentGCThread::initialize_in_thread() { | |
72 this->record_stack_base_and_size(); | |
73 this->initialize_thread_local_storage(); | |
74 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
75 // From this time Thread::current() should be working. | |
76 assert(this == Thread::current(), "just checking"); | |
77 } | |
78 | |
79 void ConcurrentGCThread::wait_for_universe_init() { | |
80 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); | |
81 while (!is_init_completed() && !_should_terminate) { | |
82 CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200); | |
83 } | |
84 } | |
85 | |
86 void ConcurrentGCThread::terminate() { | |
87 // Signal that it is terminated | |
88 { | |
89 MutexLockerEx mu(Terminator_lock, | |
90 Mutex::_no_safepoint_check_flag); | |
91 _has_terminated = true; | |
92 Terminator_lock->notify(); | |
93 } | |
94 | |
95 // Thread destructor usually does this.. | |
96 ThreadLocalStorage::set_thread(NULL); | |
97 } | |
98 | |
99 | |
100 void SuspendibleThreadSet::initialize_work() { | |
101 MutexLocker x(STS_init_lock); | |
102 if (!_initialized) { | |
103 _m = new Monitor(Mutex::leaf, | |
104 "SuspendibleThreadSetLock", true); | |
105 _async = 0; | |
106 _async_stop = false; | |
107 _async_stopped = 0; | |
108 _initialized = true; | |
109 } | |
110 } | |
111 | |
112 void SuspendibleThreadSet::join() { | |
113 initialize(); | |
114 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
115 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
116 _async++; | |
117 assert(_async > 0, "Huh."); | |
118 } | |
119 | |
120 void SuspendibleThreadSet::leave() { | |
121 assert(_initialized, "Must be initialized."); | |
122 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
123 _async--; | |
124 assert(_async >= 0, "Huh."); | |
125 if (_async_stop) _m->notify_all(); | |
126 } | |
127 | |
128 void SuspendibleThreadSet::yield(const char* id) { | |
129 assert(_initialized, "Must be initialized."); | |
130 if (_async_stop) { | |
131 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
132 if (_async_stop) { | |
133 _async_stopped++; | |
134 assert(_async_stopped > 0, "Huh."); | |
135 if (_async_stopped == _async) { | |
136 if (ConcGCYieldTimeout > 0) { | |
137 double now = os::elapsedTime(); | |
138 guarantee((now - _suspend_all_start) * 1000.0 < | |
139 (double)ConcGCYieldTimeout, | |
140 "Long delay; whodunit?"); | |
141 } | |
142 } | |
143 _m->notify_all(); | |
144 while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag); | |
145 _async_stopped--; | |
146 assert(_async >= 0, "Huh"); | |
147 _m->notify_all(); | |
148 } | |
149 } | |
150 } | |
151 | |
152 void SuspendibleThreadSet::suspend_all() { | |
153 initialize(); // If necessary. | |
154 if (ConcGCYieldTimeout > 0) { | |
155 _suspend_all_start = os::elapsedTime(); | |
156 } | |
157 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
158 assert(!_async_stop, "Only one at a time."); | |
159 _async_stop = true; | |
160 while (_async_stopped < _async) _m->wait(Mutex::_no_safepoint_check_flag); | |
161 } | |
162 | |
163 void SuspendibleThreadSet::resume_all() { | |
164 assert(_initialized, "Must be initialized."); | |
165 MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag); | |
166 assert(_async_stopped == _async, "Huh."); | |
167 _async_stop = false; | |
168 _m->notify_all(); | |
169 } | |
170 | |
171 static void _sltLoop(JavaThread* thread, TRAPS) { | |
172 SurrogateLockerThread* slt = (SurrogateLockerThread*)thread; | |
173 slt->loop(); | |
174 } | |
175 | |
176 SurrogateLockerThread::SurrogateLockerThread() : | |
177 JavaThread(&_sltLoop), | |
178 _monitor(Mutex::nonleaf, "SLTMonitor"), | |
179 _buffer(empty) | |
180 {} | |
181 | |
182 SurrogateLockerThread* SurrogateLockerThread::make(TRAPS) { | |
183 klassOop k = | |
184 SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), | |
185 true, CHECK_NULL); | |
186 instanceKlassHandle klass (THREAD, k); | |
187 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
188 | |
189 const char thread_name[] = "Surrogate Locker Thread (CMS)"; | |
190 Handle string = java_lang_String::create_from_str(thread_name, CHECK_NULL); | |
191 | |
192 // Initialize thread_oop to put it into the system threadGroup | |
193 Handle thread_group (THREAD, Universe::system_thread_group()); | |
194 JavaValue result(T_VOID); | |
195 JavaCalls::call_special(&result, thread_oop, | |
196 klass, | |
197 vmSymbolHandles::object_initializer_name(), | |
198 vmSymbolHandles::threadgroup_string_void_signature(), | |
199 thread_group, | |
200 string, | |
201 CHECK_NULL); | |
202 | |
203 SurrogateLockerThread* res; | |
204 { | |
205 MutexLocker mu(Threads_lock); | |
206 res = new SurrogateLockerThread(); | |
207 | |
208 // At this point it may be possible that no osthread was created for the | |
209 // JavaThread due to lack of memory. We would have to throw an exception | |
210 // in that case. However, since this must work and we do not allow | |
211 // exceptions anyway, check and abort if this fails. | |
212 if (res == NULL || res->osthread() == NULL) { | |
213 vm_exit_during_initialization("java.lang.OutOfMemoryError", | |
214 "unable to create new native thread"); | |
215 } | |
216 java_lang_Thread::set_thread(thread_oop(), res); | |
217 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority); | |
218 java_lang_Thread::set_daemon(thread_oop()); | |
219 | |
220 res->set_threadObj(thread_oop()); | |
221 Threads::add(res); | |
222 Thread::start(res); | |
223 } | |
224 os::yield(); // This seems to help with initial start-up of SLT | |
225 return res; | |
226 } | |
227 | |
228 void SurrogateLockerThread::manipulatePLL(SLT_msg_type msg) { | |
229 MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag); | |
230 assert(_buffer == empty, "Should be empty"); | |
231 assert(msg != empty, "empty message"); | |
232 _buffer = msg; | |
233 while (_buffer != empty) { | |
234 _monitor.notify(); | |
235 _monitor.wait(Mutex::_no_safepoint_check_flag); | |
236 } | |
237 } | |
238 | |
239 // ======= Surrogate Locker Thread ============= | |
240 | |
241 void SurrogateLockerThread::loop() { | |
242 BasicLock pll_basic_lock; | |
243 SLT_msg_type msg; | |
244 debug_only(unsigned int owned = 0;) | |
245 | |
246 while (/* !isTerminated() */ 1) { | |
247 { | |
248 MutexLocker x(&_monitor); | |
249 // Since we are a JavaThread, we can't be here at a safepoint. | |
250 assert(!SafepointSynchronize::is_at_safepoint(), | |
251 "SLT is a JavaThread"); | |
252 // wait for msg buffer to become non-empty | |
253 while (_buffer == empty) { | |
254 _monitor.notify(); | |
255 _monitor.wait(); | |
256 } | |
257 msg = _buffer; | |
258 } | |
259 switch(msg) { | |
260 case acquirePLL: { | |
261 instanceRefKlass::acquire_pending_list_lock(&pll_basic_lock); | |
262 debug_only(owned++;) | |
263 break; | |
264 } | |
265 case releaseAndNotifyPLL: { | |
266 assert(owned > 0, "Don't have PLL"); | |
267 instanceRefKlass::release_and_notify_pending_list_lock(&pll_basic_lock); | |
268 debug_only(owned--;) | |
269 break; | |
270 } | |
271 case empty: | |
272 default: { | |
273 guarantee(false,"Unexpected message in _buffer"); | |
274 break; | |
275 } | |
276 } | |
277 { | |
278 MutexLocker x(&_monitor); | |
279 // Since we are a JavaThread, we can't be here at a safepoint. | |
280 assert(!SafepointSynchronize::is_at_safepoint(), | |
281 "SLT is a JavaThread"); | |
282 _buffer = empty; | |
283 _monitor.notify(); | |
284 } | |
285 } | |
286 assert(!_monitor.owned_by_self(), "Should unlock before exit."); | |
287 } | |
288 | |
289 | |
290 // ===== STS Access From Outside CGCT ===== | |
291 | |
292 void ConcurrentGCThread::stsYield(const char* id) { | |
293 assert( Thread::current()->is_ConcurrentGC_thread(), | |
294 "only a conc GC thread can call this" ); | |
295 _sts.yield(id); | |
296 } | |
297 | |
298 bool ConcurrentGCThread::stsShouldYield() { | |
299 assert( Thread::current()->is_ConcurrentGC_thread(), | |
300 "only a conc GC thread can call this" ); | |
301 return _sts.should_yield(); | |
302 } | |
303 | |
304 void ConcurrentGCThread::stsJoin() { | |
305 assert( Thread::current()->is_ConcurrentGC_thread(), | |
306 "only a conc GC thread can call this" ); | |
307 _sts.join(); | |
308 } | |
309 | |
310 void ConcurrentGCThread::stsLeave() { | |
311 assert( Thread::current()->is_ConcurrentGC_thread(), | |
312 "only a conc GC thread can call this" ); | |
313 _sts.leave(); | |
314 } |