blob: db7978baa575b1aa688db60269db7d020d6de212 [file] [log] [blame]
// 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.
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/power_monitor/power_observer.h"
#include "base/threading/thread.h"
#include "base/time/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::PowerObserver,
public base::RefCountedThreadSafe<GpuWatchdogThread> {
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;
// Must be called after a PowerMonitor has been created. Can be called from
// any thread.
void AddPowerObserver();
virtual void Init() OVERRIDE;
virtual void CleanUp() OVERRIDE;
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 base::MessageLoop::TaskObserver {
explicit GpuWatchdogTaskObserver(GpuWatchdogThread* watchdog);
virtual ~GpuWatchdogTaskObserver();
// Implements MessageLoop::TaskObserver.
virtual void WillProcessTask(
const base::PendingTask& pending_task) OVERRIDE;
virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE;
GpuWatchdogThread* watchdog_;
virtual ~GpuWatchdogThread();
void OnAcknowledge();
void OnCheck(bool after_suspend);
void DeliberatelyTerminateToRecoverFromHang();
void OnAddPowerObserver();
// Implement PowerObserver.
virtual void OnSuspend() OVERRIDE;
virtual void OnResume() OVERRIDE;
#if defined(OS_WIN)
base::TimeDelta GetWatchedThreadTime();
base::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_;
// 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_;
bool suspended_;
#if defined(OS_CHROMEOS)
FILE* tty_file_;
} // namespace content