WorkerEventTarget.h

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/* -*- 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_dom_WorkerEventTarget_h

#define mozilla_dom_WorkerEventTarget_h

#include "nsISerialEventTarget.h"

#include "mozilla/Mutex.h"

#include "mozilla/dom/WorkerPrivate.h"

namespace mozilla::dom {

class WorkerEventTarget final : public nsISerialEventTarget {

 public:

  // The WorkerEventTarget supports different dispatch behaviors:

//

  // * Hybrid targets will attempt to dispatch as a normal runnable,

  //   but fallback to a control runnable if that fails.  This is

  //   often necessary for code that wants normal dispatch order, but

  //   also needs to execute while the worker is shutting down (possibly

  //   with a holder in place.)

//

  // * ControlOnly targets will simply dispatch a control runnable.

  enum class Behavior : uint8_t { Hybrid, ControlOnly };

 private:

  mozilla::Mutex mMutex;

  CheckedUnsafePtr<WorkerPrivate> mWorkerPrivate MOZ_GUARDED_BY(mMutex);

  const Behavior mBehavior MOZ_GUARDED_BY(mMutex);

  ~WorkerEventTarget() = default;

 public:

  WorkerEventTarget(WorkerPrivate* aWorkerPrivate, Behavior aBehavior);

  void ForgetWorkerPrivate(WorkerPrivate* aWorkerPrivate);

  NS_DECL_THREADSAFE_ISUPPORTS

  NS_DECL_NSIEVENTTARGET

  NS_DECL_NSISERIALEVENTTARGET

};

}  // namespace mozilla::dom

#endif  // mozilla_dom_WorkerEventTarget_h