зеркало из https://github.com/mozilla/gecko-dev.git
442 строки
11 KiB
C++
442 строки
11 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 License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* 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 Copyright (C) 1998
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* Netscape Communications Corporation. All Rights Reserved.
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*/
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#include "nsEventQueueService.h"
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#include "prmon.h"
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#include "nsComponentManager.h"
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#include "nsIEventQueue.h"
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#include "nsIThread.h"
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#include "nsPIEventQueueChain.h"
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static NS_DEFINE_CID(kEventQueueCID, NS_EVENTQUEUE_CID);
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////////////////////////////////////////////////////////////////////////////////
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// XXX move to nsID.h or nsHashtable.h? (copied from nsComponentManager.cpp)
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class ThreadKey: public nsHashKey {
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private:
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const PRThread* id;
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public:
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ThreadKey(const PRThread* aID) {
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id = aID;
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}
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PRUint32 HashValue(void) const {
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return (PRUint32)id;
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}
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PRBool Equals(const nsHashKey *aKey) const {
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return (id == ((const ThreadKey *) aKey)->id);
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}
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nsHashKey *Clone(void) const {
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return new ThreadKey(id);
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}
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};
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////////////////////////////////////////////////////////////////////////////////
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/*
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* EventQueueEntry maintains the data associated with each entry in
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* the EventQueue service's hash table...
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*
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* It derives from nsISupports merely as a convienence since the entries are
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* reference counted...
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*/
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class EventQueueEntry : public nsISupports
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{
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public:
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EventQueueEntry();
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virtual ~EventQueueEntry();
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// nsISupports interface...
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NS_DECL_ISUPPORTS
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nsIEventQueue* GetEventQueue(void); // addrefs!
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nsresult MakeNewQueue(nsIEventQueue **aQueue);
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nsresult AddQueue(void);
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void RemoveQueue(nsIEventQueue *aQueue); // queue goes dark, and is released
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private:
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nsIEventQueue *mQueue;
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};
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/* nsISupports interface implementation... */
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NS_IMPL_ISUPPORTS0(EventQueueEntry)
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EventQueueEntry::EventQueueEntry()
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{
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NS_INIT_REFCNT();
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MakeNewQueue(&mQueue);
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NS_ASSERTION(mQueue, "EventQueueEntry constructor failed");
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}
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EventQueueEntry::~EventQueueEntry()
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{
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NS_IF_RELEASE(mQueue);
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}
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// Return the active event queue on our chain
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nsIEventQueue* EventQueueEntry::GetEventQueue(void)
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{
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nsIEventQueue* answer = NULL;
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if (mQueue) {
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nsCOMPtr<nsPIEventQueueChain> ourChain(do_QueryInterface(mQueue));
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if (ourChain)
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ourChain->GetYoungestActive(&answer);
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else {
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NS_ADDREF(mQueue);
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answer = mQueue;
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}
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}
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return answer;
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}
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nsresult EventQueueEntry::MakeNewQueue(nsIEventQueue **aQueue)
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{
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nsIEventQueue *queue = 0;
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nsresult rv;
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rv = nsComponentManager::CreateInstance(kEventQueueCID, NULL,
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NS_GET_IID(nsIEventQueue), (void**) &queue);
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if (NS_SUCCEEDED(rv)) {
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rv = queue->Init();
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if (NS_FAILED(rv)) {
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NS_RELEASE(queue);
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queue = 0; // redundant, but makes me feel better
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}
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}
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*aQueue = queue;
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return rv;
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}
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nsresult EventQueueEntry::AddQueue(void)
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{
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nsIEventQueue *newQueue = NULL;
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nsresult rv = NS_ERROR_NOT_INITIALIZED;
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if (mQueue) {
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rv = MakeNewQueue(&newQueue);
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// add it to our chain of queues
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if (NS_SUCCEEDED(rv)) {
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nsCOMPtr<nsPIEventQueueChain> ourChain(do_QueryInterface(mQueue));
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if (ourChain)
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ourChain->AppendQueue(newQueue);
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else
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NS_RELEASE(newQueue);
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}
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}
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return rv;
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}
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void EventQueueEntry::RemoveQueue(nsIEventQueue *aQueue)
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{
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aQueue->StopAcceptingEvents();
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NS_RELEASE(aQueue);
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// it's now gone dark, and will be deleted and unlinked as soon as
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// everyone else lets go
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}
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////////////////////////////////////////////////////////////////////////////////
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nsEventQueueServiceImpl::nsEventQueueServiceImpl()
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{
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NS_INIT_REFCNT();
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mEventQTable = new nsHashtable(16);
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mEventQMonitor = PR_NewMonitor();
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}
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static PRBool
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DeleteEntry(nsHashKey *aKey, void *aData, void* closure)
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{
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EventQueueEntry* evQueueEntry = (EventQueueEntry*)aData;
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if (NULL != evQueueEntry) {
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delete evQueueEntry;
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}
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return PR_TRUE;
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}
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nsEventQueueServiceImpl::~nsEventQueueServiceImpl()
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{
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// Destroy any remaining PLEventQueue's still in the hash table...
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mEventQTable->Enumerate(DeleteEntry);
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delete mEventQTable;
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PR_DestroyMonitor(mEventQMonitor);
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}
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NS_METHOD
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nsEventQueueServiceImpl::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
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{
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if (aOuter)
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return NS_ERROR_NO_AGGREGATION;
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nsEventQueueServiceImpl* eqs = new nsEventQueueServiceImpl();
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if (eqs == NULL)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(eqs);
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nsresult rv = eqs->QueryInterface(aIID, aResult);
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NS_RELEASE(eqs);
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return rv;
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}
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/* nsISupports interface implementation... */
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NS_IMPL_ISUPPORTS1(nsEventQueueServiceImpl,nsIEventQueueService)
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/* nsIEventQueueService interface implementation... */
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NS_IMETHODIMP
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nsEventQueueServiceImpl::CreateThreadEventQueue(void)
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{
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return CreateEventQueue(PR_GetCurrentThread());
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}
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NS_IMETHODIMP
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nsEventQueueServiceImpl::CreateFromIThread(
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nsIThread *aThread, nsIEventQueue **aResult)
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{
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nsresult rv;
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PRThread *prThread;
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rv = aThread->GetPRThread(&prThread);
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if (NS_SUCCEEDED(rv)) {
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rv = CreateEventQueue(prThread); // addrefs
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if (NS_SUCCEEDED(rv))
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rv = GetThreadEventQueue(prThread, aResult); // doesn't addref
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}
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return rv;
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}
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NS_IMETHODIMP
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nsEventQueueServiceImpl::CreateEventQueue(PRThread *aThread)
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{
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nsresult rv = NS_OK;
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ThreadKey key(aThread);
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EventQueueEntry* evQueueEntry;
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/* Enter the lock which protects the EventQ hashtable... */
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PR_EnterMonitor(mEventQMonitor);
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/* create only one event queue chain per thread... */
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evQueueEntry = (EventQueueEntry*)mEventQTable->Get(&key);
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if (NULL == evQueueEntry) {
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evQueueEntry = new EventQueueEntry();
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if (NULL == evQueueEntry) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto done;
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}
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mEventQTable->Put(&key, evQueueEntry);
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}
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NS_ADDREF(evQueueEntry);
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done:
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// Release the EventQ lock...
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PR_ExitMonitor(mEventQMonitor);
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return rv;
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}
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NS_IMETHODIMP
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nsEventQueueServiceImpl::DestroyThreadEventQueue(void)
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{
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nsresult rv = NS_OK;
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ThreadKey key(PR_GetCurrentThread());
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EventQueueEntry* evQueueEntry;
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/* Enter the lock which protects the EventQ hashtable... */
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PR_EnterMonitor(mEventQMonitor);
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evQueueEntry = (EventQueueEntry*)mEventQTable->Get(&key);
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if (NULL != evQueueEntry) {
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nsrefcnt refcnt;
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NS_RELEASE2(evQueueEntry, refcnt);
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// Remove the entry from the hash table if this was the last reference...
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if (0 == refcnt) {
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mEventQTable->Remove(&key);
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}
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} else {
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rv = NS_ERROR_FAILURE;
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}
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// Release the EventQ lock...
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PR_ExitMonitor(mEventQMonitor);
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return rv;
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}
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NS_IMETHODIMP
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nsEventQueueServiceImpl::CreateFromPLEventQueue(PLEventQueue* aPLEventQueue, nsIEventQueue** aResult)
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{
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// Create our thread queue using the component manager
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nsresult rv;
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nsIEventQueue* aQueue;
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if (NS_FAILED(rv = nsComponentManager::CreateInstance(kEventQueueCID, NULL, NS_GET_IID(nsIEventQueue),
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(void**)&aQueue))) {
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return rv;
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}
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if (NS_FAILED(rv = aQueue->InitFromPLQueue(aPLEventQueue))) {
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NS_IF_RELEASE(aQueue);
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return rv;
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}
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*aResult = aQueue;
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return NS_OK;
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}
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// create new event queue, append it to the current thread's chain of event queues.
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// return it, addrefed.
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NS_IMETHODIMP
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nsEventQueueServiceImpl::PushThreadEventQueue(nsIEventQueue **aNewQueue)
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{
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nsresult rv = NS_OK;
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ThreadKey key(PR_GetCurrentThread());
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EventQueueEntry* evQueueEntry;
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NS_ASSERTION(aNewQueue, "PushThreadEventQueue called with null param");
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*aNewQueue = NULL;
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/* Enter the lock which protects the EventQ hashtable... */
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PR_EnterMonitor(mEventQMonitor);
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evQueueEntry = (EventQueueEntry*)mEventQTable->Get(&key);
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if (NULL == evQueueEntry) {
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evQueueEntry = new EventQueueEntry();
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if (NULL == evQueueEntry) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto done;
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}
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mEventQTable->Put(&key, evQueueEntry);
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}
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else {
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// An entry was already present. We need to push a new
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// queue onto our stack.
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rv = evQueueEntry->AddQueue();
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}
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if (NS_SUCCEEDED(rv)) {
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*aNewQueue = evQueueEntry->GetEventQueue();
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NS_ADDREF(evQueueEntry);
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}
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done:
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// Release the EventQ lock...
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PR_ExitMonitor(mEventQMonitor);
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return rv;
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}
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// disable and release the given queue (though the last one won't be released)
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NS_IMETHODIMP
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nsEventQueueServiceImpl::PopThreadEventQueue(nsIEventQueue *aQueue)
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{
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nsresult rv = NS_OK;
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ThreadKey key(PR_GetCurrentThread());
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EventQueueEntry* evQueueEntry;
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/* Enter the lock which protects the EventQ hashtable... */
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PR_EnterMonitor(mEventQMonitor);
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evQueueEntry = (EventQueueEntry*)mEventQTable->Get(&key);
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if (NULL != evQueueEntry) {
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nsrefcnt refcnt;
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NS_RELEASE2(evQueueEntry, refcnt);
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// Remove the entry from the hash table if this was the last reference...
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if (0 == refcnt) {
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mEventQTable->Remove(&key);
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}
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else {
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// We must be popping. (note: doesn't this always want to be executed?)
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// aQueue->ProcessPendingEvents(); // (theoretically not necessary)
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evQueueEntry->RemoveQueue(aQueue);
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}
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} else {
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rv = NS_ERROR_FAILURE;
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}
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// Release the EventQ lock...
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PR_ExitMonitor(mEventQMonitor);
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return rv;
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}
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NS_IMETHODIMP
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nsEventQueueServiceImpl::GetThreadEventQueue(PRThread* aThread, nsIEventQueue** aResult)
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{
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nsresult rv = NS_OK;
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EventQueueEntry* evQueueEntry;
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ThreadKey key(aThread);
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/* Enter the lock which protects the EventQ hashtable... */
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PR_EnterMonitor(mEventQMonitor);
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/* Parameter validation... */
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if ((NULL == aThread) || (NULL == aResult)) {
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rv = NS_ERROR_NULL_POINTER;
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goto done;
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}
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evQueueEntry = (EventQueueEntry*)mEventQTable->Get(&key);
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if (NULL != evQueueEntry) {
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*aResult = evQueueEntry->GetEventQueue(); // Queue addrefing is done by this call.
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} else {
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// XXX: Need error code for requesting an event queue when none exists...
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*aResult = NULL;
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rv = NS_ERROR_FAILURE;
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goto done;
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}
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done:
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// Release the EventQ lock...
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PR_ExitMonitor(mEventQMonitor);
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return rv;
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}
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#ifdef XP_MAC
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// Callback from the enumeration of the HashTable.
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static PRBool EventDispatchingFunc(nsHashKey *aKey, void *aData, void* closure)
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{
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EventQueueEntry* entry = (EventQueueEntry*) aData;
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nsIEventQueue* eventQueue = entry->GetEventQueue();
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if (eventQueue) {
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eventQueue->ProcessPendingEvents();
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NS_RELEASE(eventQueue);
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}
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return true;
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}
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// MAC specific. Will go away someday
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NS_IMETHODIMP nsEventQueueServiceImpl::ProcessEvents()
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{
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if ( mEventQTable )
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mEventQTable->Enumerate( EventDispatchingFunc, NULL );
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return NS_OK;
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}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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