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Side by Side Diff: base/message_loop.h

Issue 2986002: More header cleanup: (Closed) Base URL: http://src.chromium.org/git/chromium.git
Patch Set: mac compile fixes (tested locally) Created 10 years, 5 months ago
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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 <queue> 8 #include <queue>
9 #include <string> 9 #include <string>
10 10
11 #include "base/basictypes.h" 11 #include "base/basictypes.h"
12 #include "base/histogram.h" 12 #include "base/lock.h"
13 #include "base/message_pump.h" 13 #include "base/message_pump.h"
14 #include "base/observer_list.h" 14 #include "base/observer_list.h"
15 #include "base/ref_counted.h" 15 #include "base/ref_counted.h"
16 #include "base/scoped_ptr.h"
17 #include "base/task.h" 16 #include "base/task.h"
18 17
19 #if defined(OS_WIN) 18 #if defined(OS_WIN)
20 // We need this to declare base::MessagePumpWin::Dispatcher, which we should 19 // We need this to declare base::MessagePumpWin::Dispatcher, which we should
21 // really just eliminate. 20 // really just eliminate.
22 #include "base/message_pump_win.h" 21 #include "base/message_pump_win.h"
23 #elif defined(OS_POSIX) 22 #elif defined(OS_POSIX)
24 #include "base/message_pump_libevent.h" 23 #include "base/message_pump_libevent.h"
25 #if !defined(OS_MACOSX) 24 #if !defined(OS_MACOSX)
26 #include "base/message_pump_glib.h" 25 #include "base/message_pump_glib.h"
27 #endif 26 #endif
28 #endif 27 #endif
29 28
29 class Histogram;
30
30 // A MessageLoop is used to process events for a particular thread. There is 31 // A MessageLoop is used to process events for a particular thread. There is
31 // at most one MessageLoop instance per thread. 32 // at most one MessageLoop instance per thread.
32 // 33 //
33 // Events include at a minimum Task instances submitted to PostTask or those 34 // Events include at a minimum Task instances submitted to PostTask or those
34 // managed by TimerManager. Depending on the type of message pump used by the 35 // managed by TimerManager. Depending on the type of message pump used by the
35 // MessageLoop other events such as UI messages may be processed. On Windows 36 // MessageLoop other events such as UI messages may be processed. On Windows
36 // APC calls (as time permits) and signals sent to a registered set of HANDLEs 37 // APC calls (as time permits) and signals sent to a registered set of HANDLEs
37 // may also be processed. 38 // may also be processed.
38 // 39 //
39 // NOTE: Unless otherwise specified, a MessageLoop's methods may only be called 40 // NOTE: Unless otherwise specified, a MessageLoop's methods may only be called
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420 421
421 // Start recording histogram info about events and action IF it was enabled 422 // Start recording histogram info about events and action IF it was enabled
422 // and IF the statistics recorder can accept a registration of our histogram. 423 // and IF the statistics recorder can accept a registration of our histogram.
423 void StartHistogrammer(); 424 void StartHistogrammer();
424 425
425 // Add occurence of event to our histogram, so that we can see what is being 426 // Add occurence of event to our histogram, so that we can see what is being
426 // done in a specific MessageLoop instance (i.e., specific thread). 427 // done in a specific MessageLoop instance (i.e., specific thread).
427 // If message_histogram_ is NULL, this is a no-op. 428 // If message_histogram_ is NULL, this is a no-op.
428 void HistogramEvent(int event); 429 void HistogramEvent(int event);
429 430
430 static const LinearHistogram::DescriptionPair event_descriptions_[];
431 static bool enable_histogrammer_;
432
433 Type type_; 431 Type type_;
434 432
435 // A list of tasks that need to be processed by this instance. Note that 433 // A list of tasks that need to be processed by this instance. Note that
436 // this queue is only accessed (push/pop) by our current thread. 434 // this queue is only accessed (push/pop) by our current thread.
437 TaskQueue work_queue_; 435 TaskQueue work_queue_;
438 436
439 // Contains delayed tasks, sorted by their 'delayed_run_time' property. 437 // Contains delayed tasks, sorted by their 'delayed_run_time' property.
440 DelayedTaskQueue delayed_work_queue_; 438 DelayedTaskQueue delayed_work_queue_;
441 439
442 // A queue of non-nestable tasks that we had to defer because when it came 440 // A queue of non-nestable tasks that we had to defer because when it came
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595 #endif // defined(OS_POSIX) 593 #endif // defined(OS_POSIX)
596 }; 594 };
597 595
598 // Do not add any member variables to MessageLoopForIO! This is important b/c 596 // Do not add any member variables to MessageLoopForIO! This is important b/c
599 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra 597 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO). Any extra
600 // data that you need should be stored on the MessageLoop's pump_ instance. 598 // data that you need should be stored on the MessageLoop's pump_ instance.
601 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO), 599 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
602 MessageLoopForIO_should_not_have_extra_member_variables); 600 MessageLoopForIO_should_not_have_extra_member_variables);
603 601
604 #endif // BASE_MESSAGE_LOOP_H_ 602 #endif // BASE_MESSAGE_LOOP_H_
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