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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ | 5 #ifndef BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ |
6 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ | 6 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ |
7 | 7 |
8 #include <queue> | 8 #include <queue> |
9 #include <string> | 9 #include <string> |
10 | 10 |
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108 TYPE_JAVA, | 108 TYPE_JAVA, |
109 #endif // defined(OS_ANDROID) | 109 #endif // defined(OS_ANDROID) |
110 }; | 110 }; |
111 | 111 |
112 // Normally, it is not necessary to instantiate a MessageLoop. Instead, it | 112 // Normally, it is not necessary to instantiate a MessageLoop. Instead, it |
113 // is typical to make use of the current thread's MessageLoop instance. | 113 // is typical to make use of the current thread's MessageLoop instance. |
114 explicit MessageLoop(Type type = TYPE_DEFAULT); | 114 explicit MessageLoop(Type type = TYPE_DEFAULT); |
115 // Creates a TYPE_CUSTOM MessageLoop with the supplied MessagePump, which must | 115 // Creates a TYPE_CUSTOM MessageLoop with the supplied MessagePump, which must |
116 // be non-NULL. | 116 // be non-NULL. |
117 explicit MessageLoop(scoped_ptr<base::MessagePump> pump); | 117 explicit MessageLoop(scoped_ptr<base::MessagePump> pump); |
118 virtual ~MessageLoop(); | 118 ~MessageLoop() override; |
119 | 119 |
120 // Returns the MessageLoop object for the current thread, or null if none. | 120 // Returns the MessageLoop object for the current thread, or null if none. |
121 static MessageLoop* current(); | 121 static MessageLoop* current(); |
122 | 122 |
123 static void EnableHistogrammer(bool enable_histogrammer); | 123 static void EnableHistogrammer(bool enable_histogrammer); |
124 | 124 |
125 typedef scoped_ptr<MessagePump> (MessagePumpFactory)(); | 125 typedef scoped_ptr<MessagePump> (MessagePumpFactory)(); |
126 // Uses the given base::MessagePumpForUIFactory to override the default | 126 // Uses the given base::MessagePumpForUIFactory to override the default |
127 // MessagePump implementation for 'TYPE_UI'. Returns true if the factory | 127 // MessagePump implementation for 'TYPE_UI'. Returns true if the factory |
128 // was successfully registered. | 128 // was successfully registered. |
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435 // Start recording histogram info about events and action IF it was enabled | 435 // Start recording histogram info about events and action IF it was enabled |
436 // and IF the statistics recorder can accept a registration of our histogram. | 436 // and IF the statistics recorder can accept a registration of our histogram. |
437 void StartHistogrammer(); | 437 void StartHistogrammer(); |
438 | 438 |
439 // Add occurrence of event to our histogram, so that we can see what is being | 439 // Add occurrence of event to our histogram, so that we can see what is being |
440 // done in a specific MessageLoop instance (i.e., specific thread). | 440 // done in a specific MessageLoop instance (i.e., specific thread). |
441 // If message_histogram_ is NULL, this is a no-op. | 441 // If message_histogram_ is NULL, this is a no-op. |
442 void HistogramEvent(int event); | 442 void HistogramEvent(int event); |
443 | 443 |
444 // MessagePump::Delegate methods: | 444 // MessagePump::Delegate methods: |
445 virtual bool DoWork() override; | 445 bool DoWork() override; |
446 virtual bool DoDelayedWork(TimeTicks* next_delayed_work_time) override; | 446 bool DoDelayedWork(TimeTicks* next_delayed_work_time) override; |
447 virtual bool DoIdleWork() override; | 447 bool DoIdleWork() override; |
448 | 448 |
449 const Type type_; | 449 const Type type_; |
450 | 450 |
451 // A list of tasks that need to be processed by this instance. Note that | 451 // A list of tasks that need to be processed by this instance. Note that |
452 // this queue is only accessed (push/pop) by our current thread. | 452 // this queue is only accessed (push/pop) by our current thread. |
453 TaskQueue work_queue_; | 453 TaskQueue work_queue_; |
454 | 454 |
455 // How many high resolution tasks are in the pending task queue. This value | 455 // How many high resolution tasks are in the pending task queue. This value |
456 // increases by N every time we call ReloadWorkQueue() and decreases by 1 | 456 // increases by N every time we call ReloadWorkQueue() and decreases by 1 |
457 // every time we call RunTask() if the task needs a high resolution timer. | 457 // every time we call RunTask() if the task needs a high resolution timer. |
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647 | 647 |
648 // Do not add any member variables to MessageLoopForIO! This is important b/c | 648 // Do not add any member variables to MessageLoopForIO! This is important b/c |
649 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra | 649 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra |
650 // data that you need should be stored on the MessageLoop's pump_ instance. | 650 // data that you need should be stored on the MessageLoop's pump_ instance. |
651 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO), | 651 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO), |
652 MessageLoopForIO_should_not_have_extra_member_variables); | 652 MessageLoopForIO_should_not_have_extra_member_variables); |
653 | 653 |
654 } // namespace base | 654 } // namespace base |
655 | 655 |
656 #endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ | 656 #endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_ |
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