mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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72 lines
2.6 KiB
C++
72 lines
2.6 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 <wtf/Lock.h>
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#include <wtf/SharedTask.h>
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namespace JSC {
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template<typename OuterType, typename InnerType, typename UnwrapFunc>
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class ParallelSourceAdapter final : public SharedTask<InnerType()> {
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public:
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ParallelSourceAdapter(RefPtr<SharedTask<OuterType()>> outerSource, const UnwrapFunc& unwrapFunc)
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: m_outerSource(outerSource)
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, m_unwrapFunc(unwrapFunc)
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{
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}
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InnerType run() final
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{
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auto locker = holdLock(m_lock);
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do {
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if (m_innerSource) {
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if (InnerType result = m_innerSource->run())
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return result;
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m_innerSource = nullptr;
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}
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m_innerSource = m_unwrapFunc(m_outerSource->run());
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} while (m_innerSource);
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return InnerType();
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}
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private:
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RefPtr<SharedTask<OuterType()>> m_outerSource;
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RefPtr<SharedTask<InnerType()>> m_innerSource;
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UnwrapFunc m_unwrapFunc;
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Lock m_lock;
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};
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template<typename OuterType, typename InnerType, typename UnwrapFunc>
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Ref<ParallelSourceAdapter<OuterType, InnerType, UnwrapFunc>> createParallelSourceAdapter(RefPtr<SharedTask<OuterType()>> outerSource, const UnwrapFunc& unwrapFunc)
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{
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return adoptRef(*new ParallelSourceAdapter<OuterType, InnerType, UnwrapFunc>(outerSource, unwrapFunc));
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}
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} // namespace JSC
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