dom/workers/WorkerEventTarget.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_dom_WorkerEventTarget_h
   8 #define mozilla_dom_WorkerEventTarget_h
   9
  10 #include "nsISerialEventTarget.h"
  11 #include "mozilla/Mutex.h"
  12
  13 namespace mozilla {
  14 namespace dom {
  15
  16 class WorkerPrivate;
  17
  18 class WorkerEventTarget final : public nsISerialEventTarget {
  19  public:
  20   // The WorkerEventTarget supports different dispatch behaviors:
  21   //
  22   // * Hybrid targets will attempt to dispatch as a normal runnable,
  23   //   but fallback to a control runnable if that fails.  This is
  24   //   often necessary for code that wants normal dispatch order, but
  25   //   also needs to execute while the worker is shutting down (possibly
  26   //   with a holder in place.)
  27   //
  28   // * ControlOnly targets will simply dispatch a control runnable.
  29   enum class Behavior : uint8_t { Hybrid, ControlOnly };
  30
  31  private:
  32   mozilla::Mutex mMutex;
  33   WorkerPrivate* mWorkerPrivate;
  34   const Behavior mBehavior;
  35
  36   ~WorkerEventTarget() = default;
  37
  38  public:
  39   WorkerEventTarget(WorkerPrivate* aWorkerPrivate, Behavior aBehavior);
  40
  41   void ForgetWorkerPrivate(WorkerPrivate* aWorkerPrivate);
  42
  43   NS_DECL_THREADSAFE_ISUPPORTS
  44   NS_DECL_NSIEVENTTARGET
  45   NS_DECL_NSISERIALEVENTTARGET
  46 };
  47
  48 }  // namespace dom
  49 }  // namespace mozilla
  50
  51 #endif  // mozilla_dom_WorkerEventTarget_h