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