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8039147: Cleanup SuspendibleThreadSet

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Reviewed-by: brutisso, tschatzl, mgerdin
This commit is contained in:
Per Lidén 2014-04-11 12:29:24 +02:00
parent a3425b64f0
commit f1edf66ef8
15 changed files with 268 additions and 302 deletions
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hotspot/src/share/vm/gc_implementation/shared/suspendibleThreadSet.hpp Normal file
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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.
*
*/
#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP
#define SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP
#include "memory/allocation.hpp"
// A SuspendibleThreadSet is a set of threads that can be suspended.
// A thread can join and later leave the set, and periodically yield.
// If some thread (not in the set) requests, via synchronize(), that
// the threads be suspended, then the requesting thread is blocked
// until all the threads in the set have yielded or left the set. Threads
// may not enter the set when an attempted suspension is in progress. The
// suspending thread later calls desynchronize(), allowing the suspended
// threads to continue.
class SuspendibleThreadSet : public AllStatic {
private:
static uint _nthreads;
static uint _nthreads_stopped;
static bool _suspend_all;
static double _suspend_all_start;
public:
// Add the current thread to the set. May block if a suspension is in progress.
static void join();
// Removes the current thread from the set.
static void leave();
// Returns true if an suspension is in progress.
static bool should_yield() { return _suspend_all; }
// Suspends the current thread if a suspension is in progress.
static void yield();
// Returns when all threads in the set are suspended.
static void synchronize();
// Resumes all suspended threads in the set.
static void desynchronize();
};
class SuspendibleThreadSetJoiner : public StackObj {
public:
SuspendibleThreadSetJoiner() {
SuspendibleThreadSet::join();
}
~SuspendibleThreadSetJoiner() {
SuspendibleThreadSet::leave();
}
bool should_yield() {
return SuspendibleThreadSet::should_yield();
}
void yield() {
SuspendibleThreadSet::yield();
}
};
#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_SUSPENDIBLETHREADSET_HPP