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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef CHROME_FRAME_TASK_MARSHALLER_H_ | |
6 #define CHROME_FRAME_TASK_MARSHALLER_H_ | |
7 | |
8 #include <windows.h> | |
9 #include <deque> | |
10 #include <queue> | |
11 | |
12 #include "base/callback.h" | |
13 #include "base/pending_task.h" | |
14 #include "base/synchronization/lock.h" | |
15 #include "base/threading/non_thread_safe.h" | |
16 #include "base/time/time.h" | |
17 | |
18 class Task; | |
19 | |
20 namespace tracked_objects { | |
21 class Location; | |
22 } | |
23 | |
24 // TaskMarshallerThroughMessageQueue is similar to base::MessageLoopForUI | |
25 // in cases where we do not control the thread lifetime and message retrieval | |
26 // and dispatching. It uses a HWND to ::PostMessage to it as a signal that | |
27 // the task queue is not empty. | |
28 class TaskMarshallerThroughMessageQueue : public base::NonThreadSafe { | |
29 public: | |
30 TaskMarshallerThroughMessageQueue(); | |
31 virtual ~TaskMarshallerThroughMessageQueue(); | |
32 | |
33 void SetWindow(HWND wnd, UINT msg) { | |
34 wnd_ = wnd; | |
35 msg_ = msg; | |
36 } | |
37 | |
38 virtual void PostTask(const tracked_objects::Location& from_here, | |
39 const base::Closure& task); | |
40 virtual void PostDelayedTask(const tracked_objects::Location& source, | |
41 const base::Closure& task, | |
42 base::TimeDelta& delay); | |
43 | |
44 // Called by the owner of the HWND. | |
45 BOOL ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, | |
46 LRESULT& lResult, DWORD dwMsgMapID = 0); | |
47 private: | |
48 void ClearTasks(); | |
49 inline base::Closure PopTask(); | |
50 inline void ExecuteQueuedTasks(); | |
51 void ExecuteDelayedTasks(); | |
52 | |
53 // Shortest delays ordered at the top of the queue. | |
54 base::DelayedTaskQueue delayed_tasks_; | |
55 | |
56 // A list of tasks that need to be processed by this instance. | |
57 std::queue<base::Closure> pending_tasks_; | |
58 | |
59 // Lock accesses to |pending_tasks_|. | |
60 base::Lock lock_; | |
61 | |
62 // ::PostMessage parameters. | |
63 HWND wnd_; | |
64 UINT msg_; | |
65 }; | |
66 | |
67 #endif // CHROME_FRAME_TASK_MARSHALLER_H_ | |
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