gecko-dev/xpcom/threads/nsIThread.idl

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
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*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is Google Inc.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
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#include "nsIEventTarget.idl"
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[ptr] native PRThread(PRThread);
/**
* This interface provides a high-level abstraction for an operating system
* thread.
*
* Threads have a built-in event queue, and a thread is an event target that
* can receive nsIRunnable objects (events) to be processed on the thread.
*
* See nsIThreadManager for the API used to create and locate threads.
*/
[scriptable, uuid(9c889946-a73a-4af3-ae9a-ea64f7d4e3ca)]
interface nsIThread : nsIEventTarget
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{
/**
* @returns
* The NSPR thread object corresponding to this nsIThread.
*/
[noscript] readonly attribute PRThread PRThread;
/**
* Shutdown the thread. This method prevents further dispatch of events to
* the thread, and it causes any pending events to run to completion before
* the thread joins (see PR_JoinThread) with the current thread. During this
* method call, events for the current thread may be processed.
*
* This method MAY NOT be executed from the thread itself. Instead, it is
* meant to be executed from another thread (usually the thread that created
* this thread or the main application thread). When this function returns,
* the thread will be shutdown, and it will no longer be possible to dispatch
* events to the thread.
*
* @throws NS_ERROR_UNEXPECTED
* Indicates that this method was erroneously called when this thread was
* the current thread, that this thread was not created with a call to
* nsIThreadManager::NewThread, or if this method was called more than once
* on the thread object.
*/
void shutdown();
/**
* This method may be called to determine if there are any events ready to be
* processed. It may only be called when this thread is the current thread.
*
* Because events may be added to this thread by another thread, a "false"
* result does not mean that this thread has no pending events. It only
* means that there were no pending events when this method was called.
*
* @returns
* A boolean value that if "true" indicates that this thread has one or
* more pending events.
*
* @throws NS_ERROR_UNEXPECTED
* Indicates that this method was erroneously called when this thread was
* not the current thread.
*/
boolean hasPendingEvents();
/**
* Process the next event. If there are no pending events, then this method
* may wait -- depending on the value of the mayWait parameter -- until an
* event is dispatched to this thread. This method is re-entrant but may
* only be called if this thread is the current thread.
*
* @param mayWait
* A boolean parameter that if "true" indicates that the method may block
* the calling thread to wait for a pending event.
*
* @returns
* A boolean value that if "true" indicates that an event was processed.
*
* @throws NS_ERROR_UNEXPECTED
* Indicates that this method was erroneously called when this thread was
* not the current thread.
*/
boolean processNextEvent(in boolean mayWait);
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};