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// Copyright (c) 2012 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 CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
#define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop.h"
#include "base/threading/thread.h"
#include "base/time.h"
#include "content/common/gpu/gpu_watchdog.h"
namespace content {
// 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 GpuWatchdog,
public base::RefCountedThreadSafe<GpuWatchdogThread> {
public:
explicit GpuWatchdogThread(int timeout);
// Accessible on watched thread but only modified by watchdog thread.
bool armed() const { return armed_; }
void PostAcknowledge();
// Implement GpuWatchdog.
virtual void CheckArmed() OVERRIDE;
protected:
virtual void Init() OVERRIDE;
virtual void CleanUp() OVERRIDE;
private:
friend class base::RefCountedThreadSafe<GpuWatchdogThread>;
// 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(base::TimeTicks time_posted) OVERRIDE;
virtual void DidProcessTask(base::TimeTicks time_posted) OVERRIDE;
private:
GpuWatchdogThread* watchdog_;
};
virtual ~GpuWatchdogThread();
void OnAcknowledge();
void OnCheck(bool after_suspend);
void DeliberatelyTerminateToRecoverFromHang();
#if defined(OS_WIN)
base::TimeDelta GetWatchedThreadTime();
#endif
MessageLoop* watched_message_loop_;
base::TimeDelta timeout_;
volatile bool armed_;
GpuWatchdogTaskObserver task_observer_;
#if defined(OS_WIN)
void* watched_thread_handle_;
base::TimeDelta arm_cpu_time_;
#endif
// Time after which it's assumed that the computer has been suspended since
// the task was posted.
base::Time suspension_timeout_;
base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
};
} // namespace content
#endif // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
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