зеркало из https://github.com/mozilla/pjs.git
318 строки
7.4 KiB
C++
318 строки
7.4 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 "prmon.h"
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#include "nsIEventQueueService.h"
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#include "nsHashtable.h"
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#include "nsXPComFactory.h"
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static NS_DEFINE_IID(kIEventQueueServiceIID, NS_IEVENTQUEUESERVICE_IID);
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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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* This class maintains the data associated with each entry in the EventQueue
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* 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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~EventQueueEntry();
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// nsISupports interface...
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NS_DECL_ISUPPORTS
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PLEventQueue* GetEventQueue(void);
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private:
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PLEventQueue* mEventQueue;
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};
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/* nsISupports interface implementation... */
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NS_IMPL_ISUPPORTS(EventQueueEntry,kISupportsIID);
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EventQueueEntry::EventQueueEntry()
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{
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NS_INIT_REFCNT();
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mEventQueue = PL_CreateNativeEventQueue("Thread event queue...", PR_GetCurrentThread());
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}
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EventQueueEntry::~EventQueueEntry()
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{
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if (NULL != mEventQueue) {
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PL_DestroyEventQueue(mEventQueue);
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}
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}
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PLEventQueue* EventQueueEntry::GetEventQueue(void)
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{
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return mEventQueue;
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}
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class nsEventQueueServiceImpl : public nsIEventQueueService
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{
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public:
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nsEventQueueServiceImpl();
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// nsISupports interface...
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NS_DECL_ISUPPORTS
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// nsIEventQueueService interface...
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NS_IMETHOD CreateThreadEventQueue(void);
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NS_IMETHOD DestroyThreadEventQueue(void);
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NS_IMETHOD GetThreadEventQueue(PRThread* aThread, PLEventQueue** aResult);
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protected:
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~nsEventQueueServiceImpl();
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private:
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nsHashtable* mEventQTable;
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PRMonitor* mEventQMonitor;
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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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/* nsISupports interface implementation... */
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NS_IMPL_ISUPPORTS(nsEventQueueServiceImpl,kIEventQueueServiceIID);
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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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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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/* Only create one event queue 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::GetThreadEventQueue(PRThread* aThread, PLEventQueue** 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();
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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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//----------------------------------------------------------------------
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static nsEventQueueServiceImpl* gServiceInstance = NULL;
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NS_DEF_FACTORY(EventQueueServiceGen,nsEventQueueServiceImpl)
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class nsEventQueueServiceFactory : public nsEventQueueServiceGenFactory
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{
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public:
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NS_IMETHOD CreateInstance(nsISupports *aOuter,
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const nsIID &aIID,
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void **aResult);
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};
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NS_IMETHODIMP
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nsEventQueueServiceFactory::CreateInstance(nsISupports *aOuter,
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const nsIID &aIID,
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void **aResult)
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{
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nsresult rv;
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nsISupports* inst;
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// Parameter validation...
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if (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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// Do not support aggregatable components...
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*aResult = NULL;
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if (NULL != aOuter) {
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rv = NS_ERROR_NO_AGGREGATION;
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goto done;
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}
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if (NULL == gServiceInstance) {
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// Create a new instance of the component...
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NS_NEWXPCOM(gServiceInstance, nsEventQueueServiceImpl);
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if (NULL == gServiceInstance) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto done;
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}
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NS_ADDREF(gServiceInstance);
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}
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// If the QI fails, the component will be destroyed...
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//
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// Use a local copy so the NS_RELEASE() will not null the global
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// pointer...
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inst = gServiceInstance;
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NS_ADDREF(inst);
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rv = inst->QueryInterface(aIID, aResult);
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NS_RELEASE(inst);
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done:
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return rv;
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}
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// Entry point to create nsEventQueueService factory instances...
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nsresult NS_NewEventQueueServiceFactory(nsIFactory** aResult)
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{
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nsresult rv = NS_OK;
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nsIFactory* inst = new nsEventQueueServiceFactory();
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if (NULL == inst) {
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rv = NS_ERROR_OUT_OF_MEMORY;
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}
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else {
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NS_ADDREF(inst);
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}
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*aResult = inst;
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return rv;
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}
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