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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 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_H_ | 5 #ifndef BASE_MESSAGE_LOOP_H_ |
6 #define BASE_MESSAGE_LOOP_H_ | 6 #define BASE_MESSAGE_LOOP_H_ |
7 | 7 |
8 #include <deque> | 8 #include <deque> |
9 #include <queue> | 9 #include <queue> |
10 #include <string> | 10 #include <string> |
11 #include <vector> | 11 #include <vector> |
12 | 12 |
13 #include "base/histogram.h" | 13 #include "base/histogram.h" |
14 #include "base/message_pump.h" | 14 #include "base/message_pump.h" |
15 #include "base/observer_list.h" | 15 #include "base/observer_list.h" |
16 #include "base/ref_counted.h" | 16 #include "base/ref_counted.h" |
17 #include "base/task.h" | 17 #include "base/task.h" |
18 #include "base/timer.h" | 18 #include "base/timer.h" |
19 | 19 |
20 #if defined(OS_WIN) | 20 #if defined(OS_WIN) |
21 // We need this to declare base::MessagePumpWin::Dispatcher, which we should | 21 // We need this to declare base::MessagePumpWin::Dispatcher, which we should |
22 // really just eliminate. | 22 // really just eliminate. |
23 #include "base/message_pump_win.h" | 23 #include "base/message_pump_win.h" |
| 24 #elif defined(OS_LINUX) |
| 25 #include "base/message_pump_libevent.h" |
24 #endif | 26 #endif |
25 | 27 |
26 // A MessageLoop is used to process events for a particular thread. There is | 28 // A MessageLoop is used to process events for a particular thread. There is |
27 // at most one MessageLoop instance per thread. | 29 // at most one MessageLoop instance per thread. |
28 // | 30 // |
29 // Events include at a minimum Task instances submitted to PostTask or those | 31 // Events include at a minimum Task instances submitted to PostTask or those |
30 // managed by TimerManager. Depending on the type of message pump used by the | 32 // managed by TimerManager. Depending on the type of message pump used by the |
31 // MessageLoop other events such as UI messages may be processed. On Windows | 33 // MessageLoop other events such as UI messages may be processed. On Windows |
32 // APC calls (as time permits) and signals sent to a registered set of HANDLEs | 34 // APC calls (as time permits) and signals sent to a registered set of HANDLEs |
33 // may also be processed. | 35 // may also be processed. |
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267 bool operator<(const PendingTask& other) const; | 269 bool operator<(const PendingTask& other) const; |
268 }; | 270 }; |
269 | 271 |
270 typedef std::queue<PendingTask> TaskQueue; | 272 typedef std::queue<PendingTask> TaskQueue; |
271 typedef std::priority_queue<PendingTask> DelayedTaskQueue; | 273 typedef std::priority_queue<PendingTask> DelayedTaskQueue; |
272 | 274 |
273 #if defined(OS_WIN) | 275 #if defined(OS_WIN) |
274 base::MessagePumpWin* pump_win() { | 276 base::MessagePumpWin* pump_win() { |
275 return static_cast<base::MessagePumpWin*>(pump_.get()); | 277 return static_cast<base::MessagePumpWin*>(pump_.get()); |
276 } | 278 } |
| 279 #elif defined(OS_LINUX) |
| 280 public: |
| 281 base::MessagePumpLibevent* pump_libevent() { |
| 282 return static_cast<base::MessagePumpLibevent*>(pump_.get()); |
| 283 } |
| 284 protected: |
277 #endif | 285 #endif |
278 | 286 |
279 // A function to encapsulate all the exception handling capability in the | 287 // A function to encapsulate all the exception handling capability in the |
280 // stacks around the running of a main message loop. It will run the message | 288 // stacks around the running of a main message loop. It will run the message |
281 // loop in a SEH try block or not depending on the set_SEH_restoration() | 289 // loop in a SEH try block or not depending on the set_SEH_restoration() |
282 // flag. | 290 // flag. |
283 void RunHandler(); | 291 void RunHandler(); |
284 | 292 |
285 // A surrounding stack frame around the running of the message loop that | 293 // A surrounding stack frame around the running of the message loop that |
286 // supports all saving and restoring of state, as is needed for any/all (ugly) | 294 // supports all saving and restoring of state, as is needed for any/all (ugly) |
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352 // Contains delayed tasks, sorted by their 'delayed_run_time' property. | 360 // Contains delayed tasks, sorted by their 'delayed_run_time' property. |
353 DelayedTaskQueue delayed_work_queue_; | 361 DelayedTaskQueue delayed_work_queue_; |
354 | 362 |
355 // A queue of non-nestable tasks that we had to defer because when it came | 363 // A queue of non-nestable tasks that we had to defer because when it came |
356 // time to execute them we were in a nested message loop. They will execute | 364 // time to execute them we were in a nested message loop. They will execute |
357 // once we're out of nested message loops. | 365 // once we're out of nested message loops. |
358 TaskQueue deferred_non_nestable_work_queue_; | 366 TaskQueue deferred_non_nestable_work_queue_; |
359 | 367 |
360 scoped_refptr<base::MessagePump> pump_; | 368 scoped_refptr<base::MessagePump> pump_; |
361 | 369 |
| 370 #if defined(OS_LINUX) |
| 371 //struct event_base *iopump_; |
| 372 #endif |
| 373 |
362 ObserverList<DestructionObserver> destruction_observers_; | 374 ObserverList<DestructionObserver> destruction_observers_; |
363 | 375 |
364 // A recursion block that prevents accidentally running additonal tasks when | 376 // A recursion block that prevents accidentally running additonal tasks when |
365 // insider a (accidentally induced?) nested message pump. | 377 // insider a (accidentally induced?) nested message pump. |
366 bool nestable_tasks_allowed_; | 378 bool nestable_tasks_allowed_; |
367 | 379 |
368 bool exception_restoration_; | 380 bool exception_restoration_; |
369 | 381 |
370 std::string thread_name_; | 382 std::string thread_name_; |
371 // A profiling histogram showing the counts of various messages and events. | 383 // A profiling histogram showing the counts of various messages and events. |
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453 #endif // defined(OS_WIN) | 465 #endif // defined(OS_WIN) |
454 }; | 466 }; |
455 | 467 |
456 // Do not add any member variables to MessageLoopForIO! This is important b/c | 468 // Do not add any member variables to MessageLoopForIO! This is important b/c |
457 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra | 469 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra |
458 // data that you need should be stored on the MessageLoop's pump_ instance. | 470 // data that you need should be stored on the MessageLoop's pump_ instance. |
459 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO), | 471 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO), |
460 MessageLoopForIO_should_not_have_extra_member_variables); | 472 MessageLoopForIO_should_not_have_extra_member_variables); |
461 | 473 |
462 #endif // BASE_MESSAGE_LOOP_H_ | 474 #endif // BASE_MESSAGE_LOOP_H_ |
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