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// Copyright (c) 2010 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_GPU_GPU_WATCHDOG_THREAD_H_
#define CHROME_GPU_GPU_WATCHDOG_THREAD_H_
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "base/task.h"
#include "base/threading/thread.h"
// A thread that intermitently sends tasks to a group of watched message loops
// and deliberately crashes if one of them does not respond after a timeout.
class GpuWatchdogThread : public base::Thread,
public base::RefCountedThreadSafe<GpuWatchdogThread> {
public:
explicit GpuWatchdogThread(int timeout);
virtual ~GpuWatchdogThread();
// Accessible on watched thread but only modified by watchdog thread.
bool armed() const { return armed_; }
void PostAcknowledge();
protected:
virtual void Init();
virtual void CleanUp();
private:
// An object of this type intercepts the reception and completion of all tasks
// on the watched thread and checks whether the watchdog is armed.
class GpuWatchdogTaskObserver : public MessageLoop::TaskObserver {
public:
explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
virtual ~GpuWatchdogTaskObserver();
// Implements MessageLoop::TaskObserver.
virtual void WillProcessTask(const Task* task);
virtual void DidProcessTask(const Task* task);
private:
void CheckArmed();
GpuWatchdogThread* watchdog_;
};
void OnAcknowledge();
void OnCheck();
void OnExit();
void Disable();
int64 GetWatchedThreadTime();
MessageLoop* watched_message_loop_;
int timeout_;
volatile bool armed_;
GpuWatchdogTaskObserver task_observer_;
#if defined(OS_WIN)
void* watched_thread_handle_;
int64 arm_time_;
#endif
typedef ScopedRunnableMethodFactory<GpuWatchdogThread> MethodFactory;
scoped_ptr<MethodFactory> method_factory_;
DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
};
#endif // CHROME_GPU_GPU_WATCHDOG_THREAD_H_
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