67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
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/*
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* Copyright (C) 2021 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/CompletionHandler.h>
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#include <wtf/Condition.h>
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#include <wtf/Deque.h>
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#include <wtf/Lock.h>
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#include <wtf/WorkQueue.h>
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namespace WTF {
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class SuspendableWorkQueue final : public WorkQueue {
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public:
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using QOS = WorkQueue::QOS;
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WTF_EXPORT_PRIVATE static Ref<SuspendableWorkQueue> create(const char* name, QOS = QOS::Default);
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WTF_EXPORT_PRIVATE void suspend(Function<void()>&& suspendFunction, CompletionHandler<void()>&& suspensionCompletionHandler);
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WTF_EXPORT_PRIVATE void resume();
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WTF_EXPORT_PRIVATE void dispatch(Function<void()>&&) final;
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WTF_EXPORT_PRIVATE void dispatchAfter(Seconds, Function<void()>&&) final;
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WTF_EXPORT_PRIVATE void dispatchSync(Function<void()>&&) final;
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private:
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SuspendableWorkQueue(const char* name, QOS);
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void invokeAllSuspensionCompletionHandlers() WTF_REQUIRES_LOCK(m_suspensionLock);
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void suspendIfNeeded();
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#if USE(COCOA_EVENT_LOOP)
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using WorkQueue::dispatchQueue;
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#else
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using WorkQueue::runLoop;
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#endif
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Lock m_suspensionLock;
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Condition m_suspensionCondition;
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bool m_isOrWillBeSuspended WTF_GUARDED_BY_LOCK(m_suspensionLock) { false };
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Function<void()> m_suspendFunction WTF_GUARDED_BY_LOCK(m_suspensionLock);
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Vector<CompletionHandler<void()>> m_suspensionCompletionHandlers WTF_GUARDED_BY_LOCK(m_suspensionLock);
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};
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} // namespace WTF
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using WTF::SuspendableWorkQueue;
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