1/*
2 * Copyright (C) 2013, 2015, 2016 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <wtf/CrossThreadCopier.h>
29#include <wtf/Function.h>
30#include <wtf/RefPtr.h>
31#include <wtf/StdLibExtras.h>
32#include <wtf/ThreadSafeRefCounted.h>
33
34namespace WTF {
35
36class CrossThreadTask {
37 WTF_MAKE_FAST_ALLOCATED;
38public:
39 CrossThreadTask() = default;
40
41 CrossThreadTask(Function<void ()>&& taskFunction)
42 : m_taskFunction(WTFMove(taskFunction))
43 {
44 ASSERT(m_taskFunction);
45 }
46
47 void performTask()
48 {
49 m_taskFunction();
50 }
51
52protected:
53 Function<void ()> m_taskFunction;
54};
55
56template <typename F, typename ArgsTuple, size_t... ArgsIndex>
57void callFunctionForCrossThreadTaskImpl(F function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
58{
59 function(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
60}
61
62template <typename F, typename ArgsTuple, typename ArgsIndices = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
63void callFunctionForCrossThreadTask(F function, ArgsTuple&& args)
64{
65 callFunctionForCrossThreadTaskImpl(function, std::forward<ArgsTuple>(args), ArgsIndices());
66}
67
68template<typename... Parameters, typename... Arguments>
69CrossThreadTask createCrossThreadTask(void (*method)(Parameters...), const Arguments&... arguments)
70{
71 return CrossThreadTask([method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
72 callFunctionForCrossThreadTask(method, WTFMove(arguments));
73 });
74}
75
76template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex>
77void callMemberFunctionForCrossThreadTaskImpl(C* object, MF function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
78{
79 (object->*function)(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
80}
81
82template <typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
83void callMemberFunctionForCrossThreadTask(C* object, MF function, ArgsTuple&& args)
84{
85 callMemberFunctionForCrossThreadTaskImpl(object, function, std::forward<ArgsTuple>(args), ArgsIndicies());
86}
87
88template<typename T, typename std::enable_if<std::is_base_of<ThreadSafeRefCounted<T>, T>::value, int>::type = 0, typename... Parameters, typename... Arguments>
89CrossThreadTask createCrossThreadTask(T& callee, void (T::*method)(Parameters...), const Arguments&... arguments)
90{
91 return CrossThreadTask([callee = makeRefPtr(&callee), method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
92 callMemberFunctionForCrossThreadTask(callee.get(), method, WTFMove(arguments));
93 });
94}
95
96template<typename T, typename std::enable_if<!std::is_base_of<ThreadSafeRefCounted<T>, T>::value, int>::type = 0, typename... Parameters, typename... Arguments>
97CrossThreadTask createCrossThreadTask(T& callee, void (T::*method)(Parameters...), const Arguments&... arguments)
98{
99 return CrossThreadTask([callee = &callee, method, arguments = std::make_tuple(crossThreadCopy(arguments)...)]() mutable {
100 callMemberFunctionForCrossThreadTask(callee, method, WTFMove(arguments));
101 });
102}
103
104} // namespace WTF
105
106using WTF::CrossThreadTask;
107using WTF::createCrossThreadTask;
108