content/gpu/gpu_watchdog_thread.h

   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.
   4
   5 #ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
   6 #define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
   7
   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"
  15
  16 namespace content {
  17
  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,
  21                           public GpuWatchdog,
  22                           public base::PowerObserver,
  23                           public base::RefCountedThreadSafe<GpuWatchdogThread> {
  24  public:
  25   explicit GpuWatchdogThread(int timeout);
  26
  27   // Accessible on watched thread but only modified by watchdog thread.
  28   bool armed() const { return armed_; }
  29   void PostAcknowledge();
  30
  31   // Implement GpuWatchdog.
  32   virtual void CheckArmed() OVERRIDE;
  33
  34   // Must be called after a PowerMonitor has been created. Can be called from
  35   // any thread.
  36   void AddPowerObserver();
  37
  38  protected:
  39   virtual void Init() OVERRIDE;
  40   virtual void CleanUp() OVERRIDE;
  41
  42  private:
  43   friend class base::RefCountedThreadSafe<GpuWatchdogThread>;
  44
  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 {
  48    public:
  49     explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
  50     virtual ~GpuWatchdogTaskObserver();
  51
  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;
  56
  57    private:
  58     GpuWatchdogThread* watchdog_;
  59   };
  60
  61   virtual ~GpuWatchdogThread();
  62
  63   void OnAcknowledge();
  64   void OnCheck(bool after_suspend);
  65   void DeliberatelyTerminateToRecoverFromHang();
  66
  67   void OnAddPowerObserver();
  68
  69   // Implement PowerObserver.
  70   virtual void OnSuspend() OVERRIDE;
  71   virtual void OnResume() OVERRIDE;
  72
  73 #if defined(OS_WIN)
  74   base::TimeDelta GetWatchedThreadTime();
  75 #endif
  76
  77   base::MessageLoop* watched_message_loop_;
  78   base::TimeDelta timeout_;
  79   volatile bool armed_;
  80   GpuWatchdogTaskObserver task_observer_;
  81
  82 #if defined(OS_WIN)
  83   void* watched_thread_handle_;
  84   base::TimeDelta arm_cpu_time_;
  85 #endif
  86
  87   // Time after which it's assumed that the computer has been suspended since
  88   // the task was posted.
  89   base::Time suspension_timeout_;
  90
  91   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
  92
  93   bool suspended_;
  94
  95 #if defined(OS_CHROMEOS)
  96   FILE* tty_file_;
  97 #endif
  98
  99   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
 100 };
 101
 102 }  // namespace content
 103
 104 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_