зеркало из https://github.com/mozilla/pjs.git
514 строки
14 KiB
C++
514 строки
14 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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AddRef();
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/* The slightly weird ownership model for eventqueues goes like this:
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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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when it goes dark and empty. Chained queues also hold references to
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their immediate elder link, because we have code that assumes the random
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release of a queue can't break a chain earlier than our current pointer.
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A queue releases itself immediately upon being chained, dropping
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the addref given it by the factory. Only the references held to it by
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a younger chained queue (and from the outside), and this one here in the
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constructor, keep it alive. The release when it goes dark and empty
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will queue it, as it were, for destruction.
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(A dark queue no longer accepts events, an empty one has none.)
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*/
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mEventQueue = NULL;
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mYoungerQueue = NULL;
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mElderQueue = NULL;
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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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#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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Unlink();
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if (mEventQueue != NULL) {
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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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NS_ASSERTION(mElderQueue, "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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nsAutoString topic;
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topic.AssignWithConversion(aTopic);
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nsISupports *us = NS_STATIC_CAST(nsISupports *,(NS_STATIC_CAST(nsIEventQueue *,this)));
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NS_WITH_SERVICE(nsIObserverService, os, NS_OBSERVERSERVICE_PROGID, &rv);
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if (NS_SUCCEEDED(rv))
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os->Notify(us, topic.GetUnicode(), NULL);
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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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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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*aEventQueue = mEventQueue;
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if (mEventQueue == NULL)
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return NS_ERROR_NULL_POINTER;
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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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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(&end); // addrefs. released by Unlink.
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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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NS_RELEASE(aQueue); // the addref from the constructor
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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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nsPIEventQueueChain *young = mYoungerQueue,
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*old = mElderQueue;
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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 = 0;
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mElderQueue = 0;
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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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if (!young)
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NS_RELEASE(old); // release addref from AppendQueue
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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;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::GetYoungestActive(nsIEventQueue **aQueue)
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{
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nsIEventQueue *answer = NULL;
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if (mYoungerQueue)
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mYoungerQueue->GetYoungestActive(&answer);
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if (answer == NULL)
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if (mAcceptingEvents && mCouldHaveEvents) {
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answer = NS_STATIC_CAST(nsIEventQueue *, this);
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NS_ADDREF(answer);
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} else
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CheckForDeactivation();
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*aQueue = answer;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::SetYounger(nsPIEventQueueChain *aQueue)
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{
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mYoungerQueue = aQueue;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsEventQueueImpl::SetElder(nsPIEventQueueChain *aQueue)
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{
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mElderQueue = aQueue;
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return NS_OK;
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}
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