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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "platform/WebTaskRunner.h" | 5 #include "platform/WebTaskRunner.h" |
6 | 6 |
7 #include "base/bind_helpers.h" | 7 #include "base/bind_helpers.h" |
8 #include "base/single_thread_task_runner.h" | 8 #include "base/single_thread_task_runner.h" |
9 | 9 |
10 namespace base { | 10 namespace base { |
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104 TaskHandle& TaskHandle::operator=(TaskHandle&& other) { | 104 TaskHandle& TaskHandle::operator=(TaskHandle&& other) { |
105 TaskHandle tmp(std::move(other)); | 105 TaskHandle tmp(std::move(other)); |
106 runner_.Swap(tmp.runner_); | 106 runner_.Swap(tmp.runner_); |
107 return *this; | 107 return *this; |
108 } | 108 } |
109 | 109 |
110 TaskHandle::TaskHandle(RefPtr<Runner> runner) : runner_(std::move(runner)) { | 110 TaskHandle::TaskHandle(RefPtr<Runner> runner) : runner_(std::move(runner)) { |
111 DCHECK(runner_); | 111 DCHECK(runner_); |
112 } | 112 } |
113 | 113 |
114 bool WebTaskRunner::RunsTasksOnCurrentThread() { | |
115 return RunsTasksInCurrentSequence(); | |
116 } | |
117 | |
118 // Use a custom function for base::Bind instead of convertToBaseCallback to | 114 // Use a custom function for base::Bind instead of convertToBaseCallback to |
119 // avoid copying the closure later in the call chain. Copying the bound state | 115 // avoid copying the closure later in the call chain. Copying the bound state |
120 // can lead to data races with ref counted objects like StringImpl. See | 116 // can lead to data races with ref counted objects like StringImpl. See |
121 // crbug.com/679915 for more details. | 117 // crbug.com/679915 for more details. |
122 void WebTaskRunner::PostTask(const WebTraceLocation& location, | 118 void WebTaskRunner::PostTask(const WebTraceLocation& location, |
123 std::unique_ptr<CrossThreadClosure> task) { | 119 std::unique_ptr<CrossThreadClosure> task) { |
124 ToSingleThreadTaskRunner()->PostTask( | 120 ToSingleThreadTaskRunner()->PostTask( |
125 location, base::Bind(&RunCrossThreadClosure, base::Passed(&task))); | 121 location, base::Bind(&RunCrossThreadClosure, base::Passed(&task))); |
126 } | 122 } |
127 | 123 |
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141 void WebTaskRunner::PostDelayedTask(const WebTraceLocation& location, | 137 void WebTaskRunner::PostDelayedTask(const WebTraceLocation& location, |
142 std::unique_ptr<WTF::Closure> task, | 138 std::unique_ptr<WTF::Closure> task, |
143 TimeDelta delay) { | 139 TimeDelta delay) { |
144 ToSingleThreadTaskRunner()->PostDelayedTask( | 140 ToSingleThreadTaskRunner()->PostDelayedTask( |
145 location, ConvertToBaseCallback(std::move(task)), delay); | 141 location, ConvertToBaseCallback(std::move(task)), delay); |
146 } | 142 } |
147 | 143 |
148 TaskHandle WebTaskRunner::PostCancellableTask( | 144 TaskHandle WebTaskRunner::PostCancellableTask( |
149 const WebTraceLocation& location, | 145 const WebTraceLocation& location, |
150 std::unique_ptr<WTF::Closure> task) { | 146 std::unique_ptr<WTF::Closure> task) { |
151 DCHECK(RunsTasksOnCurrentThread()); | 147 DCHECK(RunsTasksInCurrentSequence()); |
152 RefPtr<TaskHandle::Runner> runner = | 148 RefPtr<TaskHandle::Runner> runner = |
153 AdoptRef(new TaskHandle::Runner(std::move(task))); | 149 AdoptRef(new TaskHandle::Runner(std::move(task))); |
154 PostTask(location, WTF::Bind(&TaskHandle::Runner::Run, runner->AsWeakPtr(), | 150 PostTask(location, WTF::Bind(&TaskHandle::Runner::Run, runner->AsWeakPtr(), |
155 TaskHandle(runner))); | 151 TaskHandle(runner))); |
156 return TaskHandle(runner); | 152 return TaskHandle(runner); |
157 } | 153 } |
158 | 154 |
159 TaskHandle WebTaskRunner::PostDelayedCancellableTask( | 155 TaskHandle WebTaskRunner::PostDelayedCancellableTask( |
160 const WebTraceLocation& location, | 156 const WebTraceLocation& location, |
161 std::unique_ptr<WTF::Closure> task, | 157 std::unique_ptr<WTF::Closure> task, |
162 TimeDelta delay) { | 158 TimeDelta delay) { |
163 DCHECK(RunsTasksOnCurrentThread()); | 159 DCHECK(RunsTasksInCurrentSequence()); |
164 RefPtr<TaskHandle::Runner> runner = | 160 RefPtr<TaskHandle::Runner> runner = |
165 AdoptRef(new TaskHandle::Runner(std::move(task))); | 161 AdoptRef(new TaskHandle::Runner(std::move(task))); |
166 PostDelayedTask(location, | 162 PostDelayedTask(location, |
167 WTF::Bind(&TaskHandle::Runner::Run, runner->AsWeakPtr(), | 163 WTF::Bind(&TaskHandle::Runner::Run, runner->AsWeakPtr(), |
168 TaskHandle(runner)), | 164 TaskHandle(runner)), |
169 delay); | 165 delay); |
170 return TaskHandle(runner); | 166 return TaskHandle(runner); |
171 } | 167 } |
172 | 168 |
173 WebTaskRunner::~WebTaskRunner() = default; | 169 WebTaskRunner::~WebTaskRunner() = default; |
174 | 170 |
175 } // namespace blink | 171 } // namespace blink |
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