gecko-dev/xpcom/threads/nsIEventQueueService.idl

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s): Rick Potts <rpotts@netscape.com>
* David Matiskella <davidm@netscape.com>
* David Hyatt <hyatt@netscape.com>
* Suresh Duddi <dp@netscape.com>
* Scott Collins <scc@netscape.com>
* Dan Matejka <danm@netscape.com>
* Doug Turner <dougt@netscape.com>
* Ray Whitmer <rayw@netscape.com>
* Dan Mosedale <dmose@mozilla.org>
*/
#include "nsISupports.idl"
#include "nsIEventQueue.idl"
%{C++
#include "prthread.h"
#include "plevent.h"
/* be761f00-a3b0-11d2-996c-0080c7cb1080 */
#define NS_EVENTQUEUESERVICE_CID \
{ 0xbe761f00, 0xa3b0, 0x11d2, \
{0x99, 0x6c, 0x00, 0x80, 0xc7, 0xcb, 0x10, 0x80} }
#define NS_EVENTQUEUESERVICE_CONTRACTID "@mozilla.org/event-queue-service;1"
#define NS_EVENTQUEUESERVICE_CLASSNAME "Event Queue Service"
#define NS_CURRENT_THREAD ((PRThread*)0)
#define NS_CURRENT_EVENTQ ((nsIEventQueue*)0)
#define NS_UI_THREAD ((PRThread*)1)
#define NS_UI_THREAD_EVENTQ ((nsIEventQueue*)1)
%}
/* a forward decl */
interface nsIThread;
[scriptable, uuid(a6cf90dc-15b3-11d2-932e-00805f8add32)]
interface nsIEventQueueService : nsISupports
{
/**
* Creates and holds a native event queue for the current thread.
* "Native" queues have an associated callback mechanism which is
* automatically triggered when an event is posted. See plevent.c for
* details.
* @return NS_OK on success, or a host of failure indications
*/
void createThreadEventQueue();
/**
* Creates and hold a monitored event queue for the current thread.
* "Monitored" queues have no callback processing mechanism.
* @return NS_OK on success, or a host of failure indications
*/
void createMonitoredThreadEventQueue();
/**
* Somewhat misnamed, this method releases the service's hold on the event
* queue(s) for this thread. Subsequent attempts to access this thread's
* queue (GetThreadEventQueue, for example) may fail, though the queue itself
* will be destroyed only after all references to it are released and the
* queue itself is no longer actively processing events.
* @return nonsense.
*/
void destroyThreadEventQueue();
nsIEventQueue createFromIThread(in nsIThread aThread,
in boolean aNative);
[noscript] nsIEventQueue createFromPLEventQueue(in PLEventQueuePtr
aPLEventQueue);
// Add a new event queue for the current thread, making it the "current"
// queue. Return that queue, addrefed.
nsIEventQueue pushThreadEventQueue();
// release and disable the queue
void popThreadEventQueue(in nsIEventQueue aQueue);
[noscript] nsIEventQueue getThreadEventQueue(in PRThreadPtr aThread);
/**
* @deprecated in favor of getSpecialEventQueue, since that's
* scriptable and this isn't.
*
* Check for any "magic" event queue constants (NS_CURRENT_EVENTQ,
* NS_UI_THREAD_EVENTQ) and return the real event queue that they
* represent, AddRef()ed. Otherwise, return the event queue passed
* in, AddRef()ed. This is not scriptable because the arguments in
* question may be magic constants rather than real nsIEventQueues.
*
* @arg queueOrConstant either a real event queue or a magic
* constant to be resolved
*
* @return a real event queue, AddRef()ed
*/
[noscript] nsIEventQueue resolveEventQueue(in nsIEventQueue queueOrConstant);
/**
* Returns the appropriate special event queue, AddRef()ed. Really
* just a scriptable version of ResolveEventQueue.
*
* @arg aQueue Either CURRENT_THREAD_EVENT_QUEUE or
* UI_THREAD_EVENT_QUEUE
* @return The requested nsIEventQueue, AddRef()ed
* @exception NS_ERROR_NULL_POINTER Zero pointer passed in for return value
* @exception NS_ERROR_ILLEGAL_VALUE Bogus constant passed in aQueue
* @exception NS_ERROR_FAILURE Error while calling
* GetThreadEventQueue()
*/
nsIEventQueue getSpecialEventQueue(in long aQueue);
const long CURRENT_THREAD_EVENT_QUEUE = 0;
const long UI_THREAD_EVENT_QUEUE = 1;
};