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 #include "mozilla/dom/WorkerPrivate.h"
  13
  14 namespace mozilla::dom {
  15
  16 class WorkerEventTarget final : public nsISerialEventTarget {
  17  public:
  18   // The WorkerEventTarget supports different dispatch behaviors:
  19   //
  20   // * Hybrid targets will attempt to dispatch as a normal runnable,
  21   //   but fallback to a control runnable if that fails.  This is
  22   //   often necessary for code that wants normal dispatch order, but
  23   //   also needs to execute while the worker is shutting down (possibly
  24   //   with a holder in place.)
  25   //
  26   // * ControlOnly targets will simply dispatch a control runnable.
  27   enum class Behavior : uint8_t { Hybrid, ControlOnly };
  28
  29  private:
  30   mozilla::Mutex mMutex;
  31   CheckedUnsafePtr<WorkerPrivate> mWorkerPrivate MOZ_GUARDED_BY(mMutex);
  32   const Behavior mBehavior MOZ_GUARDED_BY(mMutex);
  33
  34   ~WorkerEventTarget() = default;
  35
  36  public:
  37   WorkerEventTarget(WorkerPrivate* aWorkerPrivate, Behavior aBehavior);
  38
  39   void ForgetWorkerPrivate(WorkerPrivate* aWorkerPrivate);
  40
  41   NS_DECL_THREADSAFE_ISUPPORTS
  42   NS_DECL_NSIEVENTTARGET
  43   NS_DECL_NSISERIALEVENTTARGET
  44 };
  45
  46 }  // namespace mozilla::dom
  47
  48 #endif  // mozilla_dom_WorkerEventTarget_h