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// 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_
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