mirror of
https://github.com/mozilla/gecko-dev.git
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370 lines
8.9 KiB
C++
370 lines
8.9 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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static NS_DEFINE_IID(kIEventQueueServiceIID, NS_IEVENTQUEUESERVICE_IID);
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static NS_DEFINE_IID(kIEventQueueIID, NS_IEVENTQUEUE_IID);
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static NS_DEFINE_IID(kEventQueueCID, NS_EVENTQUEUE_CID);
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EventQueueStack::EventQueueStack(EventQueueStack* next)
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:mNextQueue(next)
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{
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// Create our thread queue using the component manager
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if (NS_FAILED(nsComponentManager::CreateInstance(kEventQueueCID, NULL, kIEventQueueIID,
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(void**)&mEventQueue))) {
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mEventQueue = NULL;
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}
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if (mEventQueue) {
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if (NS_FAILED(mEventQueue->Init()))
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mEventQueue = NULL;
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}
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}
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EventQueueStack::~EventQueueStack()
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{
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// Destroy our thread queue.
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NS_IF_RELEASE(mEventQueue);
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if (mNextQueue)
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{
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delete mNextQueue;
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}
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}
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nsIEventQueue* EventQueueStack::GetEventQueue()
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{
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if (mEventQueue) {
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NS_ADDREF(mEventQueue);
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}
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return mEventQueue;
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}
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EventQueueStack* EventQueueStack::GetNext()
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{
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return mNextQueue;
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}
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void EventQueueStack::SetNext(EventQueueStack* aStack)
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{
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mNextQueue = aStack;
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}
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////////////////////////////////////////////////////////////////////////////////
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/* nsISupports interface implementation... */
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NS_IMPL_ISUPPORTS(EventQueueEntry,nsISupports::GetIID());
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EventQueueEntry::EventQueueEntry()
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{
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NS_INIT_REFCNT();
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mQueueStack = new EventQueueStack();
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}
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EventQueueEntry::~EventQueueEntry()
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{
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// Delete our stack
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delete mQueueStack;
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}
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nsIEventQueue* EventQueueEntry::GetEventQueue(void)
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{
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// Return the current event queue on our stack.
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nsIEventQueue* answer = NULL;
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if (mQueueStack)
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answer = mQueueStack->GetEventQueue(); // This call addrefs the queue
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return answer;
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}
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void EventQueueEntry::PushQueue(void)
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{
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// Make a new thread queue, connect it to our current stack, and then
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// set it to be the top of our stack.
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mQueueStack = new EventQueueStack(mQueueStack);
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}
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void EventQueueEntry::PopQueue(void)
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{
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EventQueueStack* popped = mQueueStack;
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if (mQueueStack) {
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mQueueStack = mQueueStack->GetNext();
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popped->SetNext(NULL);
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}
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// This will result in the queue being released.
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delete popped;
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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_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::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, kIEventQueueIID,
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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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NS_IMETHODIMP
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nsEventQueueServiceImpl::PushThreadEventQueue()
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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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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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evQueueEntry->PushQueue();
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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::PopThreadEventQueue(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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// We must be popping.
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evQueueEntry->PopQueue();
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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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