зеркало из https://github.com/mozilla/pjs.git
584 строки
16 KiB
C++
584 строки
16 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#include "nsCOMPtr.h"
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#include "nsEventQueue.h"
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#include "nsIEventQueueService.h"
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#include "nsIThread.h"
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#include "nsIServiceManager.h"
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#include "nsIObserverService.h"
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#include "nsString.h"
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#include "prlog.h"
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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/* found these logs useful in conjunction with netlibStreamEvent logging
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from netwerk. */
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PRLogModuleInfo* gEventQueueLog = 0;
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PRUint32 gEventQueueLogCount = 0;
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PRUint32 gEventQueueLogPPCount = 0;
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static int gEventQueueLogPPLevel = 0;
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static PLEventQueue *gEventQueueLogQueue = 0;
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static PRThread *gEventQueueLogThread = 0;
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#endif
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// in a real system, these would be members in a header class...
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static char *gActivatedNotification = "nsIEventQueueActivated";
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static char *gDestroyedNotification = "nsIEventQueueDestroyed";
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nsEventQueueImpl::nsEventQueueImpl()
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{
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NS_INIT_REFCNT();
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NS_ADDREF_THIS();
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/* The slightly weird ownership model for eventqueues goes like this:
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General:
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There's an addref from the factory generally held by whoever asked for
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the queue. The queue addrefs itself (right here) and releases itself
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after someone calls StopAcceptingEvents() on the queue and when it is
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dark and empty (in CheckForDeactivation()).
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Chained queues:
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Eldest queue:
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The eldest queue in a chain is held on to by the EventQueueService
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in a hash table, so it is possible that the eldest queue may not be
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released until the EventQueueService is shutdown.
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You may not call StopAcceptingEvents() on this queue until you have
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done so on all younger queues.
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General:
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Each queue holds a reference to their immediate elder link and a weak
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reference to their immediate younger link. Because you must shut down
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queues from youngest to eldest, all the references will be removed.
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It happens something like:
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queue->StopAcceptingEvents()
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{
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CheckForDeactivation()
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{
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-- hopefully we are able to shutdown now --
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Unlink()
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{
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-- remove the reference we hold to our elder queue --
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-- NULL out our elder queues weak reference to us --
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}
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RELEASE ourself (to balance the ADDREF here in the constructor)
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-- and we should go away. --
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}
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}
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Notes:
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A dark queue no longer accepts events. An empty queue simply has no events.
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*/
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Created [queue=%lx]",(long)mEventQueue));
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++gEventQueueLogCount;
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#endif
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mYoungerQueue = nsnull;
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mEventQueue = nsnull;
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mAcceptingEvents = PR_TRUE;
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mCouldHaveEvents = PR_TRUE;
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}
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nsEventQueueImpl::~nsEventQueueImpl()
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{
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Unlink();
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Destroyed [queue=%lx]",(long)mEventQueue));
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++gEventQueueLogCount;
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#endif
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if (mEventQueue) {
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NotifyObservers(gDestroyedNotification);
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PL_DestroyEventQueue(mEventQueue);
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}
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}
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NS_IMETHODIMP
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nsEventQueueImpl::Init(PRBool aNative)
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{
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PRThread *thread = PR_GetCurrentThread();
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if (aNative)
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mEventQueue = PL_CreateNativeEventQueue("Thread event queue...", thread);
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else
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mEventQueue = PL_CreateMonitoredEventQueue("Thread event queue...", thread);
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NotifyObservers(gActivatedNotification);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::InitFromPRThread(PRThread* thread, PRBool aNative)
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{
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if (thread == NS_CURRENT_THREAD)
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{
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thread = PR_GetCurrentThread();
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}
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else if (thread == NS_UI_THREAD)
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{
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nsCOMPtr<nsIThread> mainIThread;
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nsresult rv;
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// Get the primordial thread
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rv = nsIThread::GetMainThread(getter_AddRefs(mainIThread));
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if (NS_FAILED(rv)) return rv;
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rv = mainIThread->GetPRThread(&thread);
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if (NS_FAILED(rv)) return rv;
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}
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if (aNative)
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mEventQueue = PL_CreateNativeEventQueue("Thread event queue...", thread);
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else
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mEventQueue = PL_CreateMonitoredEventQueue("Thread event queue...", thread);
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NotifyObservers(gActivatedNotification);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::InitFromPLQueue(PLEventQueue* aQueue)
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{
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mEventQueue = aQueue;
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NotifyObservers(gActivatedNotification);
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return NS_OK;
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}
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/* nsISupports interface implementation... */
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NS_IMPL_THREADSAFE_ISUPPORTS2(nsEventQueueImpl,
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nsIEventQueue,
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nsPIEventQueueChain)
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/* nsIEventQueue interface implementation... */
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NS_IMETHODIMP
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nsEventQueueImpl::StopAcceptingEvents()
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{
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// this assertion is bogus. I should be able to shut down the eldest queue,
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// as long as there are no younger children
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NS_ASSERTION(mElderQueue || !mYoungerQueue, "attempted to disable eldest queue in chain");
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mAcceptingEvents = PR_FALSE;
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CheckForDeactivation();
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: StopAccepting [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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++gEventQueueLogCount;
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#endif
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return NS_OK;
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}
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// utility funtion to send observers a notification
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void
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nsEventQueueImpl::NotifyObservers(const char *aTopic)
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{
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nsresult rv;
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nsCOMPtr<nsIObserverService> os = do_GetService(NS_OBSERVERSERVICE_CONTRACTID, &rv);
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if (NS_SUCCEEDED(rv)) {
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nsAutoString topic;
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topic.AssignWithConversion(aTopic);
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nsCOMPtr<nsIEventQueue> kungFuDeathGrip(this);
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nsCOMPtr<nsISupports> us(do_QueryInterface(kungFuDeathGrip));
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os->Notify(us, topic.GetUnicode(), NULL);
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}
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}
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NS_IMETHODIMP
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nsEventQueueImpl::InitEvent(PLEvent* aEvent,
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void* owner,
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PLHandleEventProc handler,
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PLDestroyEventProc destructor)
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{
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PL_InitEvent(aEvent, owner, handler, destructor);
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return NS_OK;
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}
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NS_IMETHODIMP_(PRStatus)
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nsEventQueueImpl::PostEvent(PLEvent* aEvent)
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{
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if (!mAcceptingEvents) {
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Punt posted event [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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++gEventQueueLogCount;
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#endif
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PRStatus rv = PR_FAILURE;
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NS_ASSERTION(mElderQueue, "event dropped because event chain is dead");
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if (mElderQueue) {
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nsCOMPtr<nsIEventQueue> elder(do_QueryInterface(mElderQueue));
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if (elder)
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rv = elder->PostEvent(aEvent);
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}
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return rv;
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}
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Posting event [queue=%lx]", (long)mEventQueue));
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++gEventQueueLogCount;
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#endif
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return PL_PostEvent(mEventQueue, aEvent);
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}
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NS_IMETHODIMP
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nsEventQueueImpl::PostSynchronousEvent(PLEvent* aEvent, void** aResult)
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{
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if (!mAcceptingEvents) {
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Punt posted synchronous event [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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++gEventQueueLogCount;
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#endif
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nsresult rv = NS_ERROR_NO_INTERFACE;
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NS_ASSERTION(mElderQueue, "event dropped because event chain is dead");
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if (mElderQueue) {
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nsCOMPtr<nsIEventQueue> elder(do_QueryInterface(mElderQueue));
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if (elder)
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rv = elder->PostSynchronousEvent(aEvent, aResult);
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return rv;
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}
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return NS_ERROR_ABORT;
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}
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Posting synchronous event [queue=%lx]", (long)mEventQueue));
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++gEventQueueLogCount;
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#endif
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void* result = PL_PostSynchronousEvent(mEventQueue, aEvent);
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if (aResult)
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*aResult = result;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::EnterMonitor()
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{
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PL_ENTER_EVENT_QUEUE_MONITOR(mEventQueue);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::ExitMonitor()
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{
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PL_EXIT_EVENT_QUEUE_MONITOR(mEventQueue);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::RevokeEvents(void* owner)
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{
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PL_RevokeEvents(mEventQueue, owner);
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if (mElderQueue) {
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nsCOMPtr<nsIEventQueue> elder(do_QueryInterface(mElderQueue));
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if (elder)
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elder->RevokeEvents(owner);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::GetPLEventQueue(PLEventQueue** aEventQueue)
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{
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if (!mEventQueue)
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return NS_ERROR_NULL_POINTER;
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*aEventQueue = mEventQueue;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::IsQueueOnCurrentThread(PRBool *aResult)
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{
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*aResult = PL_IsQueueOnCurrentThread( mEventQueue );
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::IsQueueNative(PRBool *aResult)
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{
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*aResult = PL_IsQueueNative(mEventQueue);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::ProcessPendingEvents()
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{
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PRBool correctThread = PL_IsQueueOnCurrentThread(mEventQueue);
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NS_ASSERTION(correctThread, "attemping to process events on the wrong thread");
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if (!correctThread)
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return NS_ERROR_FAILURE;
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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++gEventQueueLogPPLevel;
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if ((gEventQueueLogQueue != mEventQueue || gEventQueueLogThread != PR_GetCurrentThread() ||
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gEventQueueLogCount != gEventQueueLogPPCount) && gEventQueueLogPPLevel == 1) {
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: Process pending [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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gEventQueueLogPPCount = ++gEventQueueLogCount;
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gEventQueueLogQueue = mEventQueue;
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gEventQueueLogThread = PR_GetCurrentThread();
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}
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#endif
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PL_ProcessPendingEvents(mEventQueue);
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CheckForDeactivation();
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if (mElderQueue) {
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nsCOMPtr<nsIEventQueue> elder(do_QueryInterface(mElderQueue));
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if (elder)
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elder->ProcessPendingEvents();
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}
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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--gEventQueueLogPPLevel;
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#endif
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::EventLoop()
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{
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PRBool correctThread = PL_IsQueueOnCurrentThread(mEventQueue);
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NS_ASSERTION(correctThread, "attemping to process events on the wrong thread");
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if (!correctThread)
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return NS_ERROR_FAILURE;
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PL_EventLoop(mEventQueue);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::EventAvailable(PRBool& aResult)
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{
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aResult = PL_EventAvailable(mEventQueue);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::GetEvent(PLEvent** aResult)
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{
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*aResult = PL_GetEvent(mEventQueue);
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CheckForDeactivation();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::HandleEvent(PLEvent* aEvent)
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{
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PRBool correctThread = PL_IsQueueOnCurrentThread(mEventQueue);
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NS_ASSERTION(correctThread, "attemping to process events on the wrong thread");
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if (!correctThread)
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return NS_ERROR_FAILURE;
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: handle event [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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++gEventQueueLogCount;
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#endif
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PL_HandleEvent(aEvent);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::WaitForEvent(PLEvent** aResult)
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{
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PRBool correctThread = PL_IsQueueOnCurrentThread(mEventQueue);
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NS_ASSERTION(correctThread, "attemping to process events on the wrong thread");
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if (!correctThread)
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return NS_ERROR_FAILURE;
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: wait for event [queue=%lx, accept=%d, could=%d]",
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(long)mEventQueue,(int)mAcceptingEvents,(int)mCouldHaveEvents));
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++gEventQueueLogCount;
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#endif
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*aResult = PL_WaitForEvent(mEventQueue);
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CheckForDeactivation();
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return NS_OK;
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}
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NS_IMETHODIMP_(PRInt32)
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nsEventQueueImpl::GetEventQueueSelectFD()
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{
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return PL_GetEventQueueSelectFD(mEventQueue);
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}
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NS_METHOD
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nsEventQueueImpl::Create(nsISupports *aOuter,
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REFNSIID aIID,
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void **aResult)
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{
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nsEventQueueImpl* evt = new nsEventQueueImpl();
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if (evt == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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nsresult rv = evt->QueryInterface(aIID, aResult);
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if (NS_FAILED(rv)) {
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delete evt;
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}
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return rv;
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}
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// ---------------- nsPIEventQueueChain -----------------
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NS_IMETHODIMP
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nsEventQueueImpl::AppendQueue(nsIEventQueue *aQueue)
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{
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nsresult rv;
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nsCOMPtr<nsIEventQueue> end;
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nsCOMPtr<nsPIEventQueueChain> queueChain(do_QueryInterface(aQueue));
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if (!aQueue)
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return NS_ERROR_NO_INTERFACE;
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/* this would be nice
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NS_ASSERTION(aQueue->mYoungerQueue == NULL && aQueue->mElderQueue == NULL,
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"event queue repeatedly appended to queue chain");
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*/
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rv = NS_ERROR_NO_INTERFACE;
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// (be careful doing this outside nsEventQueueService's mEventQMonitor)
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GetYoungest(getter_AddRefs(end));
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nsCOMPtr<nsPIEventQueueChain> endChain(do_QueryInterface(end));
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if (endChain) {
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endChain->SetYounger(queueChain);
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queueChain->SetElder(endChain);
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rv = NS_OK;
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}
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return rv;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::Unlink()
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{
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nsCOMPtr<nsPIEventQueueChain> young = mYoungerQueue,
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old = mElderQueue;
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#if defined(PR_LOGGING) && defined(DEBUG_danm)
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PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
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("EventQueue: unlink [queue=%lx, younger=%lx, elder=%lx]",
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(long)mEventQueue,(long)mYoungerQueue, (long)mElderQueue.get()));
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++gEventQueueLogCount;
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#endif
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// this is probably OK, but shouldn't happen by design, so tell me if it does
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NS_ASSERTION(!mYoungerQueue, "event queue chain broken in middle");
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// break links early in case the Release cascades back onto us
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mYoungerQueue = nsnull;
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mElderQueue = nsnull;
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if (young)
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young->SetElder(old);
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if (old) {
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old->SetYounger(young);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::GetYoungest(nsIEventQueue **aQueue)
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{
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if (mYoungerQueue)
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return mYoungerQueue->GetYoungest(aQueue);
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nsIEventQueue *answer = NS_STATIC_CAST(nsIEventQueue *, this);
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NS_ADDREF(answer);
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*aQueue = answer;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsEventQueueImpl::GetYoungestActive(nsIEventQueue **aQueue)
|
|
{
|
|
nsCOMPtr<nsIEventQueue> answer;
|
|
|
|
if (mYoungerQueue)
|
|
mYoungerQueue->GetYoungestActive(getter_AddRefs(answer));
|
|
if (!answer) {
|
|
if (mAcceptingEvents && mCouldHaveEvents)
|
|
answer = NS_STATIC_CAST(nsIEventQueue *, this);
|
|
else
|
|
CheckForDeactivation();
|
|
}
|
|
*aQueue = answer;
|
|
NS_IF_ADDREF(*aQueue);
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsEventQueueImpl::SetYounger(nsPIEventQueueChain *aQueue)
|
|
{
|
|
mYoungerQueue = aQueue;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsEventQueueImpl::SetElder(nsPIEventQueueChain *aQueue)
|
|
{
|
|
mElderQueue = aQueue;
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsEventQueueImpl::GetYounger(nsIEventQueue **aQueue)
|
|
{
|
|
if (!mYoungerQueue) {
|
|
*aQueue = nsnull;
|
|
return NS_OK;
|
|
}
|
|
return mYoungerQueue->QueryInterface(NS_GET_IID(nsIEventQueue), (void**)&aQueue);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsEventQueueImpl::GetElder(nsIEventQueue **aQueue)
|
|
{
|
|
if (!mElderQueue) {
|
|
*aQueue = nsnull;
|
|
return NS_OK;
|
|
}
|
|
return mElderQueue->QueryInterface(NS_GET_IID(nsIEventQueue), (void**)&aQueue);
|
|
}
|
|
|