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https://github.com/darlinghq/darling-JavaScriptCore.git
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58 lines
2.3 KiB
C++
58 lines
2.3 KiB
C++
/*
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* Copyright (C) 2017 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. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "MutatorScheduler.h"
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namespace JSC {
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// The JSC concurrent GC relies on stopping the world to stay ahead of the retreating wavefront.
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// It so happens that the same API can be reused to implement a non-concurrent GC mode, which we
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// use on platforms that don't support the GC's atomicity protocols. That means anything other
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// than X86-64 and ARM64. This scheduler is a drop-in replacement for the concurrent GC's
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// SpaceTimeMutatorScheduler. It tells the GC to never resume the world once the GC cycle begins.
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class SynchronousStopTheWorldMutatorScheduler final : public MutatorScheduler {
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public:
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SynchronousStopTheWorldMutatorScheduler();
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~SynchronousStopTheWorldMutatorScheduler() final;
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State state() const final;
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void beginCollection() final;
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MonotonicTime timeToStop() final;
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MonotonicTime timeToResume() final;
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void endCollection() final;
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private:
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State m_state { Normal };
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};
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} // namespace JSC
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