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authorZeno Albisser <zeno.albisser@digia.com>2013-08-15 21:46:11 +0200
committerZeno Albisser <zeno.albisser@digia.com>2013-08-15 21:46:11 +0200
commit679147eead574d186ebf3069647b4c23e8ccace6 (patch)
treefc247a0ac8ff119f7c8550879ebb6d3dd8d1ff69 /chromium/content/gpu/gpu_watchdog_thread.h
downloadqtwebengine-chromium-679147eead574d186ebf3069647b4c23e8ccace6.tar.gz
Initial import.
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+// 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.
+
+#ifndef CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
+#define CONTENT_GPU_GPU_WATCHDOG_THREAD_H_
+
+#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> {
+ public:
+ 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();
+
+ protected:
+ virtual void Init() OVERRIDE;
+ virtual void CleanUp() OVERRIDE;
+
+ private:
+ 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 {
+ public:
+ 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;
+
+ private:
+ 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();
+#endif
+
+ 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_;
+#endif
+
+ // 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_;
+
+ DISALLOW_COPY_AND_ASSIGN(GpuWatchdogThread);
+};
+
+} // namespace content
+
+#endif // CONTENT_GPU_GPU_WATCHDOG_THREAD_H_