зеркало из https://github.com/mozilla/gecko-dev.git
100 строки
2.9 KiB
C++
100 строки
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_workers_WorkerHolder_h
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#define mozilla_dom_workers_WorkerHolder_h
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#include "mozilla/dom/WorkerCommon.h"
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namespace mozilla {
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namespace dom {
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class WorkerPrivate;
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/**
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* Use this chart to help figure out behavior during each of the closing
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* statuses. Details below.
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*
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* +========================================================+
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* | Closing Statuses |
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* +=============+=============+=================+==========+
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* | status | clear queue | abort execution | notified |
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* +=============+=============+=================+==========+
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* | Closing | yes | no | no |
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* +-------------+-------------+-----------------+----------+
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* | Canceling | yes | yes | yes |
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* +-------------+-------------+-----------------+----------+
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* | Killing | yes | yes | yes |
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* +-------------+-------------+-----------------+----------+
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*/
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enum WorkerStatus {
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// Not yet scheduled.
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Pending = 0,
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// This status means that the worker is active.
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Running,
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// Inner script called close() on the worker global scope. Setting this
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// status causes the worker to clear its queue of events but does not abort
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// the currently running script. WorkerHolder/WorkerRef objects are not going
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// to be notified because the behavior of APIs/Components should not change
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// during this status yet.
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Closing,
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// Either the user navigated away from the owning page or the owning page fell
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// out of bfcache. Setting this status causes the worker to abort immediately.
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// Since the page has gone away the worker may not post any messages.
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Canceling,
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// The application is shutting down. Setting this status causes the worker to
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// abort immediately.
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Killing,
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// The worker is effectively dead.
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Dead
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};
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class WorkerHolder {
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public:
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enum Behavior {
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AllowIdleShutdownStart,
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PreventIdleShutdownStart,
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};
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explicit WorkerHolder(const char* aName,
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Behavior aBehavior = PreventIdleShutdownStart);
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virtual ~WorkerHolder();
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bool HoldWorker(WorkerPrivate* aWorkerPrivate, WorkerStatus aFailStatus);
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void ReleaseWorker();
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virtual bool Notify(WorkerStatus aStatus) = 0;
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Behavior GetBehavior() const;
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const char* Name() const { return mName; }
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protected:
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void ReleaseWorkerInternal();
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WorkerPrivate* MOZ_NON_OWNING_REF mWorkerPrivate;
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private:
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void AssertIsOwningThread() const;
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const Behavior mBehavior;
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// For debugging only.
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void* mThread;
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const char* mName;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* mozilla_dom_workers_WorkerHolder_h */
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