59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
/*
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* Copyright (c) 2019, 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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#ifndef SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
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#define SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
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#include "memory/allocation.hpp"
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#include "runtime/semaphore.hpp"
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#include "utilities/globalDefinitions.hpp"
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// In addition to the barrier tag, it uses two counters to keep the semaphore
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// count correct and not leave any late thread waiting.
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class GenericWaitBarrier : public CHeapObj<mtInternal> {
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volatile int _barrier_tag;
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// The number of threads waiting on or about to wait on the semaphore.
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volatile int _waiters;
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// The number of threads in the wait path, before or after the tag check.
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// These threads can become waiters.
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volatile int _barrier_threads;
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Semaphore _sem_barrier;
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NONCOPYABLE(GenericWaitBarrier);
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int wake_if_needed();
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public:
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GenericWaitBarrier() : _barrier_tag(0), _waiters(0), _barrier_threads(0), _sem_barrier(0) {}
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~GenericWaitBarrier() {}
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const char* description() { return "semaphore"; }
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void arm(int barrier_tag);
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void disarm();
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void wait(int barrier_tag);
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};
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#endif // SHARE_UTILITIES_WAITBARRIER_GENERIC_HPP
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