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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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