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   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   void Init() override;
  40   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     ~GpuWatchdogTaskObserver() override;
  51
  52     // Implements MessageLoop::TaskObserver.
  53     void WillProcessTask(const base::PendingTask& pending_task) override;
  54     void DidProcessTask(const base::PendingTask& pending_task) override;
  55
  56    private:
  57     GpuWatchdogThread* watchdog_;
  58   };
  59
  60   ~GpuWatchdogThread() override;
  61
  62   void OnAcknowledge();
  63   void OnCheck(bool after_suspend);
  64   void DeliberatelyTerminateToRecoverFromHang();
  65
  66   void OnAddPowerObserver();
  67
  68   // Implement PowerObserver.
  69   void OnSuspend() override;
  70   void OnResume() override;
  71
  72 #if defined(OS_WIN)
  73   base::TimeDelta GetWatchedThreadTime();
  74 #endif
  75
  76   base::MessageLoop* watched_message_loop_;
  77   base::TimeDelta timeout_;
  78   volatile bool armed_;
  79   GpuWatchdogTaskObserver task_observer_;
  80
  81 #if defined(OS_WIN)
  82   void* watched_thread_handle_;
  83   base::TimeDelta arm_cpu_time_;
  84 #endif
  85
  86   // Time after which it's assumed that the computer has been suspended since
  87   // the task was posted.
  88   base::Time suspension_timeout_;
  89
  90   bool suspended_;
  91
  92 #if defined(OS_CHROMEOS)
  93   FILE* tty_file_;
  94 #endif
  95
  96   base::WeakPtrFactory<GpuWatchdogThread> weak_factory_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
  99 };
 100
 101 }  // namespace content
 102
 103 #endif  // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_