/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_ProcessHangMonitor_h

#define mozilla_ProcessHangMonitor_h

#include "mozilla/AlreadyAddRefed.h"

#include "mozilla/Atomics.h"

#include "nsCOMPtr.h"

#include "nsIObserver.h"

#include "nsStringFwd.h"

class nsIRunnable;

class nsITabChild;

class nsIThread;

namespace mozilla {

namespace dom {

class ContentParent;

class TabParent;

} // namespace dom

namespace layers {

struct LayersObserverEpoch;

} // namespace layers

class PProcessHangMonitorParent;

class ProcessHangMonitor final

  : public nsIObserver

{

 private:

  ProcessHangMonitor();

  virtual ~ProcessHangMonitor();

 public:

  static ProcessHangMonitor* Get() { return sInstance; }

  static ProcessHangMonitor* GetOrCreate();

  NS_DECL_ISUPPORTS

  NS_DECL_NSIOBSERVER

  static PProcessHangMonitorParent* AddProcess(dom::ContentParent* aContentParent);

  static void RemoveProcess(PProcessHangMonitorParent* aParent);

  static void ClearHang();

  static void PaintWhileInterruptingJS(PProcessHangMonitorParent* aParent,

                                       dom::TabParent* aTab,

                                       bool aForceRepaint,

                                       const layers::LayersObserverEpoch& aEpoch);

  static void ClearPaintWhileInterruptingJS(const layers::LayersObserverEpoch& aEpoch);

  static void MaybeStartPaintWhileInterruptingJS();

  enum SlowScriptAction {

    Continue,

    Terminate,

    StartDebugger,

    TerminateGlobal,

  };

  SlowScriptAction NotifySlowScript(nsITabChild* aTabChild,

                                    const char* aFileName,

                                    const nsString& aAddonId);

  void NotifyPluginHang(uint32_t aPluginId);

  bool IsDebuggerStartupComplete();

  void InitiateCPOWTimeout();

  bool ShouldTimeOutCPOWs();

  void Dispatch(already_AddRefed<nsIRunnable> aRunnable);

  bool IsOnThread();

 private:

  static ProcessHangMonitor* sInstance;

  Atomic<bool> mCPOWTimeout;

  nsCOMPtr<nsIThread> mThread;

};

} // namespace mozilla

#endif // mozilla_ProcessHangMonitor_h