110 lines
4.5 KiB
C++
110 lines
4.5 KiB
C++
/*
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* Copyright (C) 2013, 2015, 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/CrossThreadCopier.h>
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#include <wtf/Function.h>
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#include <wtf/RefPtr.h>
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#include <wtf/StdLibExtras.h>
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#include <wtf/ThreadSafeRefCounted.h>
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namespace WTF {
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class CrossThreadTask {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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CrossThreadTask() = default;
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CrossThreadTask(Function<void ()>&& taskFunction)
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: m_taskFunction(WTFMove(taskFunction))
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{
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ASSERT(m_taskFunction);
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}
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void performTask()
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{
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m_taskFunction();
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}
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explicit operator bool() const { return !!m_taskFunction; }
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protected:
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Function<void ()> m_taskFunction;
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};
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template <typename F, typename ArgsTuple, size_t... ArgsIndex>
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void callFunctionForCrossThreadTaskImpl(F function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
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{
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function(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
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}
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template <typename F, typename ArgsTuple, typename ArgsIndices = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
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void callFunctionForCrossThreadTask(F function, ArgsTuple&& args)
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{
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callFunctionForCrossThreadTaskImpl(function, std::forward<ArgsTuple>(args), ArgsIndices());
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}
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template<typename... Parameters, typename... Arguments>
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CrossThreadTask createCrossThreadTask(void (*method)(Parameters...), const Arguments&... arguments)
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{
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return CrossThreadTask([method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
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callFunctionForCrossThreadTask(method, WTFMove(arguments));
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});
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}
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template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex>
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void callMemberFunctionForCrossThreadTaskImpl(C* object, MF function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
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{
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(object->*function)(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
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}
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template <typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
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void callMemberFunctionForCrossThreadTask(C* object, MF function, ArgsTuple&& args)
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{
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callMemberFunctionForCrossThreadTaskImpl(object, function, std::forward<ArgsTuple>(args), ArgsIndicies());
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}
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template<typename T, typename std::enable_if<std::is_base_of<ThreadSafeRefCountedBase, T>::value, int>::type = 0, typename... Parameters, typename... Arguments>
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CrossThreadTask createCrossThreadTask(T& callee, void (T::*method)(Parameters...), const Arguments&... arguments)
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{
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return CrossThreadTask([callee = makeRefPtr(&callee), method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
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callMemberFunctionForCrossThreadTask(callee.get(), method, WTFMove(arguments));
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});
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}
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template<typename T, typename std::enable_if<!std::is_base_of<ThreadSafeRefCountedBase, T>::value, int>::type = 0, typename... Parameters, typename... Arguments>
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CrossThreadTask createCrossThreadTask(T& callee, void (T::*method)(Parameters...), const Arguments&... arguments)
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{
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return CrossThreadTask([callee = &callee, method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
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callMemberFunctionForCrossThreadTask(callee, method, WTFMove(arguments));
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});
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}
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} // namespace WTF
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using WTF::CrossThreadTask;
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using WTF::createCrossThreadTask;
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