| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_FRAME_TASK_MARSHALLER_H_ |
| #define CHROME_FRAME_TASK_MARSHALLER_H_ |
| |
| #include <windows.h> |
| #include <deque> |
| #include <queue> |
| |
| #include "base/callback.h" |
| #include "base/pending_task.h" |
| #include "base/synchronization/lock.h" |
| #include "base/threading/non_thread_safe.h" |
| #include "base/time/time.h" |
| |
| class Task; |
| |
| namespace tracked_objects { |
| class Location; |
| } |
| |
| // TaskMarshallerThroughMessageQueue is similar to base::MessageLoopForUI |
| // in cases where we do not control the thread lifetime and message retrieval |
| // and dispatching. It uses a HWND to ::PostMessage to it as a signal that |
| // the task queue is not empty. |
| class TaskMarshallerThroughMessageQueue : public base::NonThreadSafe { |
| public: |
| TaskMarshallerThroughMessageQueue(); |
| virtual ~TaskMarshallerThroughMessageQueue(); |
| |
| void SetWindow(HWND wnd, UINT msg) { |
| wnd_ = wnd; |
| msg_ = msg; |
| } |
| |
| virtual void PostTask(const tracked_objects::Location& from_here, |
| const base::Closure& task); |
| virtual void PostDelayedTask(const tracked_objects::Location& source, |
| const base::Closure& task, |
| base::TimeDelta& delay); |
| |
| // Called by the owner of the HWND. |
| BOOL ProcessWindowMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, |
| LRESULT& lResult, DWORD dwMsgMapID = 0); |
| private: |
| void ClearTasks(); |
| inline base::Closure PopTask(); |
| inline void ExecuteQueuedTasks(); |
| void ExecuteDelayedTasks(); |
| |
| // Shortest delays ordered at the top of the queue. |
| base::DelayedTaskQueue delayed_tasks_; |
| |
| // A list of tasks that need to be processed by this instance. |
| std::queue<base::Closure> pending_tasks_; |
| |
| // Lock accesses to |pending_tasks_|. |
| base::Lock lock_; |
| |
| // ::PostMessage parameters. |
| HWND wnd_; |
| UINT msg_; |
| }; |
| |
| #endif // CHROME_FRAME_TASK_MARSHALLER_H_ |