Mercurial > hg > truffle
diff src/share/vm/gc_implementation/shared/suspendibleThreadSet.cpp @ 20192:581e70386ec9
8039147: Cleanup SuspendibleThreadSet
Reviewed-by: brutisso, tschatzl, mgerdin
author | pliden |
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date | Fri, 11 Apr 2014 12:29:24 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/shared/suspendibleThreadSet.cpp Fri Apr 11 12:29:24 2014 +0200 @@ -0,0 +1,93 @@ +/* + * 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(); +}