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