gecko-dev/xpcom/threads/nsICancelableRunnable.idl

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsIRunnable.idl"
/**
* Represents a task which can be dispatched to a thread for execution and
* which can be cancelled if necessary.
*/
[scriptable, uuid(de93dc4c-5eea-4eb7-b6d1-dbf1e0cef65c)]
interface nsICancelableRunnable : nsIRunnable
{
/**
* Cancels a pending task. If the task has already been executed this will
* be a no-op. Calling this method twice is considered an error.
*
* @throws NS_ERROR_UNEXPECTED
* Indicates that the runnable has already been canceled.
*/
void cancel();
};