Mercurial > hg > truffle
view src/share/vm/gc_implementation/shared/suspendibleThreadSet.cpp @ 20340:fbc31318922c hs25.40-b06
Merge
author | amurillo |
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date | Thu, 21 Aug 2014 14:42:54 -0700 |
parents | 581e70386ec9 |
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/* * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "gc_implementation/shared/suspendibleThreadSet.hpp" #include "runtime/mutexLocker.hpp" #include "runtime/thread.inline.hpp" uint SuspendibleThreadSet::_nthreads = 0; uint SuspendibleThreadSet::_nthreads_stopped = 0; bool SuspendibleThreadSet::_suspend_all = false; double SuspendibleThreadSet::_suspend_all_start = 0.0; void SuspendibleThreadSet::join() { MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); while (_suspend_all) { ml.wait(Mutex::_no_safepoint_check_flag); } _nthreads++; } void SuspendibleThreadSet::leave() { MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); assert(_nthreads > 0, "Invalid"); _nthreads--; if (_suspend_all) { ml.notify_all(); } } void SuspendibleThreadSet::yield() { if (_suspend_all) { MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); if (_suspend_all) { _nthreads_stopped++; if (_nthreads_stopped == _nthreads) { if (ConcGCYieldTimeout > 0) { double now = os::elapsedTime(); guarantee((now - _suspend_all_start) * 1000.0 < (double)ConcGCYieldTimeout, "Long delay"); } } ml.notify_all(); while (_suspend_all) { ml.wait(Mutex::_no_safepoint_check_flag); } assert(_nthreads_stopped > 0, "Invalid"); _nthreads_stopped--; ml.notify_all(); } } } void SuspendibleThreadSet::synchronize() { assert(Thread::current()->is_VM_thread(), "Must be the VM thread"); if (ConcGCYieldTimeout > 0) { _suspend_all_start = os::elapsedTime(); } MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); assert(!_suspend_all, "Only one at a time"); _suspend_all = true; while (_nthreads_stopped < _nthreads) { ml.wait(Mutex::_no_safepoint_check_flag); } } void SuspendibleThreadSet::desynchronize() { assert(Thread::current()->is_VM_thread(), "Must be the VM thread"); MonitorLockerEx ml(STS_lock, Mutex::_no_safepoint_check_flag); assert(_nthreads_stopped == _nthreads, "Invalid"); _suspend_all = false; ml.notify_all(); }