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annotate src/share/vm/gc_implementation/shared/concurrentGCThread.cpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
parents | c18cbe5936b8 |
children | 6e0aac35bfa9 |
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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 } |