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 void CheckArmed() override;
34 // Must be called after a PowerMonitor has been created. Can be called from
36 void AddPowerObserver();
40 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 ~GpuWatchdogTaskObserver() override;
52 // Implements MessageLoop::TaskObserver.
53 void WillProcessTask(const base::PendingTask& pending_task) override;
54 void DidProcessTask(const base::PendingTask& pending_task) override;
57 GpuWatchdogThread* watchdog_;
60 ~GpuWatchdogThread() override;
63 void OnCheck(bool after_suspend);
64 void DeliberatelyTerminateToRecoverFromHang();
66 void OnAddPowerObserver();
68 // Implement PowerObserver.
69 void OnSuspend() override;
70 void OnResume() override;
73 base::TimeDelta GetWatchedThreadTime();
76 base::MessageLoop* watched_message_loop_;
77 base::TimeDelta timeout_;
79 GpuWatchdogTaskObserver task_observer_;
82 void* watched_thread_handle_;
83 base::TimeDelta arm_cpu_time_;
86 // Time after which it's assumed that the computer has been suspended since
87 // the task was posted.
88 base::Time suspension_timeout_;
92 #if defined(OS_CHROMEOS)
96 base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
98 DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
101 } // namespace content
103 #endif // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_