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