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Side by Side Diff: content/public/browser/browser_thread.h

Issue 2726523002: Pass Callback to TaskRunner by value and consume it on invocation (1) (Closed)
Patch Set: s/base::ResetAndReturn/std::move/ Created 3 years, 9 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 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 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_ 5 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_
6 #define CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_ 6 #define CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_
7 7
8 #include <string> 8 #include <string>
9 #include <utility> 9 #include <utility>
10 10
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99 ID_COUNT 99 ID_COUNT
100 }; 100 };
101 101
102 // These are the same methods in message_loop.h, but are guaranteed to either 102 // These are the same methods in message_loop.h, but are guaranteed to either
103 // get posted to the MessageLoop if it's still alive, or be deleted otherwise. 103 // get posted to the MessageLoop if it's still alive, or be deleted otherwise.
104 // They return true iff the thread existed and the task was posted. Note that 104 // They return true iff the thread existed and the task was posted. Note that
105 // even if the task is posted, there's no guarantee that it will run, since 105 // even if the task is posted, there's no guarantee that it will run, since
106 // the target thread may already have a Quit message in its queue. 106 // the target thread may already have a Quit message in its queue.
107 static bool PostTask(ID identifier, 107 static bool PostTask(ID identifier,
108 const tracked_objects::Location& from_here, 108 const tracked_objects::Location& from_here,
109 const base::Closure& task); 109 base::Closure task);
110 static bool PostDelayedTask(ID identifier, 110 static bool PostDelayedTask(ID identifier,
111 const tracked_objects::Location& from_here, 111 const tracked_objects::Location& from_here,
112 const base::Closure& task, 112 base::Closure task,
113 base::TimeDelta delay); 113 base::TimeDelta delay);
114 static bool PostNonNestableTask(ID identifier, 114 static bool PostNonNestableTask(ID identifier,
115 const tracked_objects::Location& from_here, 115 const tracked_objects::Location& from_here,
116 const base::Closure& task); 116 base::Closure task);
117 static bool PostNonNestableDelayedTask( 117 static bool PostNonNestableDelayedTask(
118 ID identifier, 118 ID identifier,
119 const tracked_objects::Location& from_here, 119 const tracked_objects::Location& from_here,
120 const base::Closure& task, 120 base::Closure task,
121 base::TimeDelta delay); 121 base::TimeDelta delay);
122 122
123 static bool PostTaskAndReply(ID identifier, 123 static bool PostTaskAndReply(ID identifier,
124 const tracked_objects::Location& from_here, 124 const tracked_objects::Location& from_here,
125 base::Closure task, 125 base::Closure task,
126 base::Closure reply); 126 base::Closure reply);
127 127
128 template <typename ReturnType, typename ReplyArgType> 128 template <typename ReturnType, typename ReplyArgType>
129 static bool PostTaskAndReplyWithResult( 129 static bool PostTaskAndReplyWithResult(
130 ID identifier, 130 ID identifier,
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166 // something slow and noncritical that doesn't need to block shutdown), 166 // something slow and noncritical that doesn't need to block shutdown),
167 // or you want to manually provide a sequence token (which saves a map 167 // or you want to manually provide a sequence token (which saves a map
168 // lookup and is guaranteed unique without you having to come up with a 168 // lookup and is guaranteed unique without you having to come up with a
169 // unique string), you can access the sequenced worker pool directly via 169 // unique string), you can access the sequenced worker pool directly via
170 // GetBlockingPool(). 170 // GetBlockingPool().
171 // 171 //
172 // If you need to PostTaskAndReplyWithResult, use 172 // If you need to PostTaskAndReplyWithResult, use
173 // base::PostTaskAndReplyWithResult() with GetBlockingPool() as the task 173 // base::PostTaskAndReplyWithResult() with GetBlockingPool() as the task
174 // runner. 174 // runner.
175 static bool PostBlockingPoolTask(const tracked_objects::Location& from_here, 175 static bool PostBlockingPoolTask(const tracked_objects::Location& from_here,
176 const base::Closure& task); 176 base::Closure task);
177 static bool PostBlockingPoolTaskAndReply( 177 static bool PostBlockingPoolTaskAndReply(
178 const tracked_objects::Location& from_here, 178 const tracked_objects::Location& from_here,
179 base::Closure task, 179 base::Closure task,
180 base::Closure reply); 180 base::Closure reply);
181 static bool PostBlockingPoolSequencedTask( 181 static bool PostBlockingPoolSequencedTask(
182 const std::string& sequence_token_name, 182 const std::string& sequence_token_name,
183 const tracked_objects::Location& from_here, 183 const tracked_objects::Location& from_here,
184 const base::Closure& task); 184 base::Closure task);
185 185
186 // For use with scheduling non-critical tasks for execution after startup. 186 // For use with scheduling non-critical tasks for execution after startup.
187 // The order or execution of tasks posted here is unspecified even when 187 // The order or execution of tasks posted here is unspecified even when
188 // posting to a SequencedTaskRunner and tasks are not guaranteed to be run 188 // posting to a SequencedTaskRunner and tasks are not guaranteed to be run
189 // prior to browser shutdown. 189 // prior to browser shutdown.
190 // When called after the browser startup is complete, will post |task| 190 // When called after the browser startup is complete, will post |task|
191 // to |task_runner| immediately. 191 // to |task_runner| immediately.
192 // Note: see related ContentBrowserClient::PostAfterStartupTask. 192 // Note: see related ContentBrowserClient::PostAfterStartupTask.
193 static void PostAfterStartupTask( 193 static void PostAfterStartupTask(
194 const tracked_objects::Location& from_here, 194 const tracked_objects::Location& from_here,
195 const scoped_refptr<base::TaskRunner>& task_runner, 195 const scoped_refptr<base::TaskRunner>& task_runner,
196 const base::Closure& task); 196 base::Closure task);
197 197
198 // Returns the thread pool used for blocking file I/O. Use this object to 198 // Returns the thread pool used for blocking file I/O. Use this object to
199 // perform random blocking operations such as file writes or querying the 199 // perform random blocking operations such as file writes or querying the
200 // Windows registry. 200 // Windows registry.
201 static base::SequencedWorkerPool* GetBlockingPool() WARN_UNUSED_RESULT; 201 static base::SequencedWorkerPool* GetBlockingPool() WARN_UNUSED_RESULT;
202 202
203 // Callable on any thread. Returns whether the given well-known thread is 203 // Callable on any thread. Returns whether the given well-known thread is
204 // initialized. 204 // initialized.
205 static bool IsThreadInitialized(ID identifier) WARN_UNUSED_RESULT; 205 static bool IsThreadInitialized(ID identifier) WARN_UNUSED_RESULT;
206 206
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292 private: 292 private:
293 friend class BrowserThreadImpl; 293 friend class BrowserThreadImpl;
294 294
295 BrowserThread() {} 295 BrowserThread() {}
296 DISALLOW_COPY_AND_ASSIGN(BrowserThread); 296 DISALLOW_COPY_AND_ASSIGN(BrowserThread);
297 }; 297 };
298 298
299 } // namespace content 299 } // namespace content
300 300
301 #endif // CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_ 301 #endif // CONTENT_PUBLIC_BROWSER_BROWSER_THREAD_H_
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