WorkerEventTarget.h (1708B)
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 "mozilla/Mutex.h" 11 #include "mozilla/dom/WorkerPrivate.h" 12 #include "nsISerialEventTarget.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 // 28 // * DebuggerOnly targets will simply dispatch a debugger runnable. 29 enum class Behavior : uint8_t { Hybrid, ControlOnly, DebuggerOnly }; 30 31 private: 32 mozilla::Mutex mMutex; 33 CheckedUnsafePtr<WorkerPrivate> mWorkerPrivate MOZ_GUARDED_BY(mMutex); 34 const Behavior mBehavior MOZ_GUARDED_BY(mMutex); 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 mozilla::dom 49 50 #endif // mozilla_dom_WorkerEventTarget_h