1 // Copyright (c) 2012 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.
5 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
6 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
8 #include "base/memory/ref_counted.h"
9 #include "base/memory/weak_ptr.h"
10 #include "base/message_loop/message_loop.h"
11 #include "base/power_monitor/power_observer.h"
12 #include "base/threading/thread.h"
13 #include "base/time/time.h"
14 #include "content/common/gpu/gpu_watchdog.h"
18 // A thread that intermitently sends tasks to a group of watched message loops
19 // and deliberately crashes if one of them does not respond after a timeout.
20 class GpuWatchdogThread : public base::Thread,
22 public base::PowerObserver,
23 public base::RefCountedThreadSafe<GpuWatchdogThread> {
25 explicit GpuWatchdogThread(int timeout);
27 // Accessible on watched thread but only modified by watchdog thread.
28 bool armed() const { return armed_; }
29 void PostAcknowledge();
31 // Implement GpuWatchdog.
32 virtual void CheckArmed() OVERRIDE;
34 // Must be called after a PowerMonitor has been created. Can be called from
36 void AddPowerObserver();
39 virtual void Init() OVERRIDE;
40 virtual void CleanUp() OVERRIDE;
43 friend class base::RefCountedThreadSafe<GpuWatchdogThread>;
45 // An object of this type intercepts the reception and completion of all tasks
46 // on the watched thread and checks whether the watchdog is armed.
47 class GpuWatchdogTaskObserver : public base::MessageLoop::TaskObserver {
49 explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
50 virtual ~GpuWatchdogTaskObserver();
52 // Implements MessageLoop::TaskObserver.
53 virtual void WillProcessTask(
54 const base::PendingTask& pending_task) OVERRIDE;
55 virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE;
58 GpuWatchdogThread* watchdog_;
61 virtual ~GpuWatchdogThread();
64 void OnCheck(bool after_suspend);
65 void DeliberatelyTerminateToRecoverFromHang();
67 void OnAddPowerObserver();
69 // Implement PowerObserver.
70 virtual void OnSuspend() OVERRIDE;
71 virtual void OnResume() OVERRIDE;
74 base::TimeDelta GetWatchedThreadTime();
77 base::MessageLoop* watched_message_loop_;
78 base::TimeDelta timeout_;
80 GpuWatchdogTaskObserver task_observer_;
83 void* watched_thread_handle_;
84 base::TimeDelta arm_cpu_time_;
87 // Time after which it's assumed that the computer has been suspended since
88 // the task was posted.
89 base::Time suspension_timeout_;
91 base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
95 #if defined(OS_CHROMEOS)
99 DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
102 } // namespace content
104 #endif // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_