1.1 --- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentGCThread.cpp Fri Nov 14 14:23:05 2008 -0800
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,314 +0,0 @@
1.4 -/*
1.5 - * Copyright 2001-2005 Sun Microsystems, Inc. All Rights Reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation.
1.11 - *
1.12 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 - * version 2 for more details (a copy is included in the LICENSE file that
1.16 - * accompanied this code).
1.17 - *
1.18 - * You should have received a copy of the GNU General Public License version
1.19 - * 2 along with this work; if not, write to the Free Software Foundation,
1.20 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 - *
1.22 - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 - * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 - * have any questions.
1.25 - *
1.26 - */
1.27 -
1.28 -// CopyrightVersion 1.2
1.29 -
1.30 -# include "incls/_precompiled.incl"
1.31 -# include "incls/_concurrentGCThread.cpp.incl"
1.32 -
1.33 -bool ConcurrentGCThread::_should_terminate = false;
1.34 -bool ConcurrentGCThread::_has_terminated = false;
1.35 -int ConcurrentGCThread::_CGC_flag = CGC_nil;
1.36 -
1.37 -SuspendibleThreadSet ConcurrentGCThread::_sts;
1.38 -
1.39 -ConcurrentGCThread::ConcurrentGCThread() {
1.40 - _sts.initialize();
1.41 -};
1.42 -
1.43 -void ConcurrentGCThread::stopWorldAndDo(VoidClosure* op) {
1.44 - MutexLockerEx x(Heap_lock,
1.45 - Mutex::_no_safepoint_check_flag);
1.46 - // warning("CGC: about to try stopping world");
1.47 - SafepointSynchronize::begin();
1.48 - // warning("CGC: successfully stopped world");
1.49 - op->do_void();
1.50 - SafepointSynchronize::end();
1.51 - // warning("CGC: successfully restarted world");
1.52 -}
1.53 -
1.54 -void ConcurrentGCThread::safepoint_synchronize() {
1.55 - _sts.suspend_all();
1.56 -}
1.57 -
1.58 -void ConcurrentGCThread::safepoint_desynchronize() {
1.59 - _sts.resume_all();
1.60 -}
1.61 -
1.62 -void ConcurrentGCThread::create_and_start() {
1.63 - if (os::create_thread(this, os::cgc_thread)) {
1.64 - // XXX: need to set this to low priority
1.65 - // unless "agressive mode" set; priority
1.66 - // should be just less than that of VMThread.
1.67 - os::set_priority(this, NearMaxPriority);
1.68 - if (!_should_terminate && !DisableStartThread) {
1.69 - os::start_thread(this);
1.70 - }
1.71 - }
1.72 -}
1.73 -
1.74 -void ConcurrentGCThread::initialize_in_thread() {
1.75 - this->record_stack_base_and_size();
1.76 - this->initialize_thread_local_storage();
1.77 - this->set_active_handles(JNIHandleBlock::allocate_block());
1.78 - // From this time Thread::current() should be working.
1.79 - assert(this == Thread::current(), "just checking");
1.80 -}
1.81 -
1.82 -void ConcurrentGCThread::wait_for_universe_init() {
1.83 - MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
1.84 - while (!is_init_completed() && !_should_terminate) {
1.85 - CGC_lock->wait(Mutex::_no_safepoint_check_flag, 200);
1.86 - }
1.87 -}
1.88 -
1.89 -void ConcurrentGCThread::terminate() {
1.90 - // Signal that it is terminated
1.91 - {
1.92 - MutexLockerEx mu(Terminator_lock,
1.93 - Mutex::_no_safepoint_check_flag);
1.94 - _has_terminated = true;
1.95 - Terminator_lock->notify();
1.96 - }
1.97 -
1.98 - // Thread destructor usually does this..
1.99 - ThreadLocalStorage::set_thread(NULL);
1.100 -}
1.101 -
1.102 -
1.103 -void SuspendibleThreadSet::initialize_work() {
1.104 - MutexLocker x(STS_init_lock);
1.105 - if (!_initialized) {
1.106 - _m = new Monitor(Mutex::leaf,
1.107 - "SuspendibleThreadSetLock", true);
1.108 - _async = 0;
1.109 - _async_stop = false;
1.110 - _async_stopped = 0;
1.111 - _initialized = true;
1.112 - }
1.113 -}
1.114 -
1.115 -void SuspendibleThreadSet::join() {
1.116 - initialize();
1.117 - MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
1.118 - while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag);
1.119 - _async++;
1.120 - assert(_async > 0, "Huh.");
1.121 -}
1.122 -
1.123 -void SuspendibleThreadSet::leave() {
1.124 - assert(_initialized, "Must be initialized.");
1.125 - MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
1.126 - _async--;
1.127 - assert(_async >= 0, "Huh.");
1.128 - if (_async_stop) _m->notify_all();
1.129 -}
1.130 -
1.131 -void SuspendibleThreadSet::yield(const char* id) {
1.132 - assert(_initialized, "Must be initialized.");
1.133 - if (_async_stop) {
1.134 - MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
1.135 - if (_async_stop) {
1.136 - _async_stopped++;
1.137 - assert(_async_stopped > 0, "Huh.");
1.138 - if (_async_stopped == _async) {
1.139 - if (ConcGCYieldTimeout > 0) {
1.140 - double now = os::elapsedTime();
1.141 - guarantee((now - _suspend_all_start) * 1000.0 <
1.142 - (double)ConcGCYieldTimeout,
1.143 - "Long delay; whodunit?");
1.144 - }
1.145 - }
1.146 - _m->notify_all();
1.147 - while (_async_stop) _m->wait(Mutex::_no_safepoint_check_flag);
1.148 - _async_stopped--;
1.149 - assert(_async >= 0, "Huh");
1.150 - _m->notify_all();
1.151 - }
1.152 - }
1.153 -}
1.154 -
1.155 -void SuspendibleThreadSet::suspend_all() {
1.156 - initialize(); // If necessary.
1.157 - if (ConcGCYieldTimeout > 0) {
1.158 - _suspend_all_start = os::elapsedTime();
1.159 - }
1.160 - MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
1.161 - assert(!_async_stop, "Only one at a time.");
1.162 - _async_stop = true;
1.163 - while (_async_stopped < _async) _m->wait(Mutex::_no_safepoint_check_flag);
1.164 -}
1.165 -
1.166 -void SuspendibleThreadSet::resume_all() {
1.167 - assert(_initialized, "Must be initialized.");
1.168 - MutexLockerEx x(_m, Mutex::_no_safepoint_check_flag);
1.169 - assert(_async_stopped == _async, "Huh.");
1.170 - _async_stop = false;
1.171 - _m->notify_all();
1.172 -}
1.173 -
1.174 -static void _sltLoop(JavaThread* thread, TRAPS) {
1.175 - SurrogateLockerThread* slt = (SurrogateLockerThread*)thread;
1.176 - slt->loop();
1.177 -}
1.178 -
1.179 -SurrogateLockerThread::SurrogateLockerThread() :
1.180 - JavaThread(&_sltLoop),
1.181 - _monitor(Mutex::nonleaf, "SLTMonitor"),
1.182 - _buffer(empty)
1.183 -{}
1.184 -
1.185 -SurrogateLockerThread* SurrogateLockerThread::make(TRAPS) {
1.186 - klassOop k =
1.187 - SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(),
1.188 - true, CHECK_NULL);
1.189 - instanceKlassHandle klass (THREAD, k);
1.190 - instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL);
1.191 -
1.192 - const char thread_name[] = "Surrogate Locker Thread (CMS)";
1.193 - Handle string = java_lang_String::create_from_str(thread_name, CHECK_NULL);
1.194 -
1.195 - // Initialize thread_oop to put it into the system threadGroup
1.196 - Handle thread_group (THREAD, Universe::system_thread_group());
1.197 - JavaValue result(T_VOID);
1.198 - JavaCalls::call_special(&result, thread_oop,
1.199 - klass,
1.200 - vmSymbolHandles::object_initializer_name(),
1.201 - vmSymbolHandles::threadgroup_string_void_signature(),
1.202 - thread_group,
1.203 - string,
1.204 - CHECK_NULL);
1.205 -
1.206 - SurrogateLockerThread* res;
1.207 - {
1.208 - MutexLocker mu(Threads_lock);
1.209 - res = new SurrogateLockerThread();
1.210 -
1.211 - // At this point it may be possible that no osthread was created for the
1.212 - // JavaThread due to lack of memory. We would have to throw an exception
1.213 - // in that case. However, since this must work and we do not allow
1.214 - // exceptions anyway, check and abort if this fails.
1.215 - if (res == NULL || res->osthread() == NULL) {
1.216 - vm_exit_during_initialization("java.lang.OutOfMemoryError",
1.217 - "unable to create new native thread");
1.218 - }
1.219 - java_lang_Thread::set_thread(thread_oop(), res);
1.220 - java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
1.221 - java_lang_Thread::set_daemon(thread_oop());
1.222 -
1.223 - res->set_threadObj(thread_oop());
1.224 - Threads::add(res);
1.225 - Thread::start(res);
1.226 - }
1.227 - os::yield(); // This seems to help with initial start-up of SLT
1.228 - return res;
1.229 -}
1.230 -
1.231 -void SurrogateLockerThread::manipulatePLL(SLT_msg_type msg) {
1.232 - MutexLockerEx x(&_monitor, Mutex::_no_safepoint_check_flag);
1.233 - assert(_buffer == empty, "Should be empty");
1.234 - assert(msg != empty, "empty message");
1.235 - _buffer = msg;
1.236 - while (_buffer != empty) {
1.237 - _monitor.notify();
1.238 - _monitor.wait(Mutex::_no_safepoint_check_flag);
1.239 - }
1.240 -}
1.241 -
1.242 -// ======= Surrogate Locker Thread =============
1.243 -
1.244 -void SurrogateLockerThread::loop() {
1.245 - BasicLock pll_basic_lock;
1.246 - SLT_msg_type msg;
1.247 - debug_only(unsigned int owned = 0;)
1.248 -
1.249 - while (/* !isTerminated() */ 1) {
1.250 - {
1.251 - MutexLocker x(&_monitor);
1.252 - // Since we are a JavaThread, we can't be here at a safepoint.
1.253 - assert(!SafepointSynchronize::is_at_safepoint(),
1.254 - "SLT is a JavaThread");
1.255 - // wait for msg buffer to become non-empty
1.256 - while (_buffer == empty) {
1.257 - _monitor.notify();
1.258 - _monitor.wait();
1.259 - }
1.260 - msg = _buffer;
1.261 - }
1.262 - switch(msg) {
1.263 - case acquirePLL: {
1.264 - instanceRefKlass::acquire_pending_list_lock(&pll_basic_lock);
1.265 - debug_only(owned++;)
1.266 - break;
1.267 - }
1.268 - case releaseAndNotifyPLL: {
1.269 - assert(owned > 0, "Don't have PLL");
1.270 - instanceRefKlass::release_and_notify_pending_list_lock(&pll_basic_lock);
1.271 - debug_only(owned--;)
1.272 - break;
1.273 - }
1.274 - case empty:
1.275 - default: {
1.276 - guarantee(false,"Unexpected message in _buffer");
1.277 - break;
1.278 - }
1.279 - }
1.280 - {
1.281 - MutexLocker x(&_monitor);
1.282 - // Since we are a JavaThread, we can't be here at a safepoint.
1.283 - assert(!SafepointSynchronize::is_at_safepoint(),
1.284 - "SLT is a JavaThread");
1.285 - _buffer = empty;
1.286 - _monitor.notify();
1.287 - }
1.288 - }
1.289 - assert(!_monitor.owned_by_self(), "Should unlock before exit.");
1.290 -}
1.291 -
1.292 -
1.293 -// ===== STS Access From Outside CGCT =====
1.294 -
1.295 -void ConcurrentGCThread::stsYield(const char* id) {
1.296 - assert( Thread::current()->is_ConcurrentGC_thread(),
1.297 - "only a conc GC thread can call this" );
1.298 - _sts.yield(id);
1.299 -}
1.300 -
1.301 -bool ConcurrentGCThread::stsShouldYield() {
1.302 - assert( Thread::current()->is_ConcurrentGC_thread(),
1.303 - "only a conc GC thread can call this" );
1.304 - return _sts.should_yield();
1.305 -}
1.306 -
1.307 -void ConcurrentGCThread::stsJoin() {
1.308 - assert( Thread::current()->is_ConcurrentGC_thread(),
1.309 - "only a conc GC thread can call this" );
1.310 - _sts.join();
1.311 -}
1.312 -
1.313 -void ConcurrentGCThread::stsLeave() {
1.314 - assert( Thread::current()->is_ConcurrentGC_thread(),
1.315 - "only a conc GC thread can call this" );
1.316 - _sts.leave();
1.317 -}
