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fe53cdd395
Classes that inherit from DiscardableRunnable are only promising that it is OK for Run() to be skipped, rather than promising that Cancel() is effective. Differential Revision: https://phabricator.services.mozilla.com/D98117
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=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 XPCOM_THREADS_NSIDISCARDABLERUNNABLE_H_
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#define XPCOM_THREADS_NSIDISCARDABLERUNNABLE_H_
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#include "nsISupports.h"
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/**
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* An interface implemented by nsIRunnable tasks for which nsIRunnable::Run()
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* might not be called.
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*/
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#define NS_IDISCARDABLERUNNABLE_IID \
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{ \
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0xde93dc4c, 0x755c, 0x4cdc, { \
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0x96, 0x76, 0x35, 0xc6, 0x48, 0x81, 0x59, 0x78 \
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} \
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}
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class NS_NO_VTABLE nsIDiscardableRunnable : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IDISCARDABLERUNNABLE_IID)
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/**
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* Called exactly once on a queued task only if nsIRunnable::Run() is not
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* called.
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*/
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virtual void OnDiscard() = 0;
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protected:
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nsIDiscardableRunnable() = default;
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virtual ~nsIDiscardableRunnable() = default;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIDiscardableRunnable,
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NS_IDISCARDABLERUNNABLE_IID)
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#endif // XPCOM_THREADS_NSIDISCARDABLERUNNABLE_H_
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