63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
/*
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* Copyright (C) 2010-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Condition.h>
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#include <wtf/Lock.h>
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#include <wtf/Noncopyable.h>
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#include <wtf/TimeWithDynamicClockType.h>
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namespace WTF {
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class BinarySemaphore final {
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WTF_MAKE_NONCOPYABLE(BinarySemaphore);
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WTF_MAKE_FAST_ALLOCATED;
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public:
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constexpr BinarySemaphore() = default;
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WTF_EXPORT_PRIVATE void signal();
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WTF_EXPORT_PRIVATE bool waitUntil(const TimeWithDynamicClockType&);
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bool waitFor(Seconds relativeTimeout)
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{
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return waitUntil(MonotonicTime::now() + relativeTimeout);
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}
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void wait()
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{
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waitUntil(ParkingLot::Time::infinity());
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}
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private:
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bool m_isSet WTF_GUARDED_BY_LOCK(m_lock) { false };
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Lock m_lock;
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Condition m_condition;
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};
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} // namespace WTF
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using WTF::BinarySemaphore;
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