gecko-dev/xpcom/threads/nsEventQueue.h

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3.2 KiB
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*/
#include "prmon.h"
#include "nsIEventQueue.h"
#include "nsPIEventQueueChain.h"
class nsEventQueueImpl : public nsIEventQueue,
public nsPIEventQueueChain
{
public:
nsEventQueueImpl();
virtual ~nsEventQueueImpl();
// nsISupports interface...
NS_DECL_ISUPPORTS
// nsIEventQueue interface...
NS_IMETHOD InitEvent(PLEvent* aEvent, void* owner,
PLHandleEventProc handler, PLDestroyEventProc destructor);
NS_IMETHOD_(PRStatus) PostEvent(PLEvent* aEvent);
NS_IMETHOD PostSynchronousEvent(PLEvent* aEvent, void** aResult);
NS_IMETHOD ProcessPendingEvents();
NS_IMETHOD EventLoop();
NS_IMETHOD EventAvailable(PRBool& aResult);
NS_IMETHOD GetEvent(PLEvent** aResult);
NS_IMETHOD HandleEvent(PLEvent* aEvent);
NS_IMETHOD WaitForEvent(PLEvent** aResult);
NS_IMETHOD_(PRInt32) GetEventQueueSelectFD();
NS_IMETHOD Init();
NS_IMETHOD InitFromPRThread(PRThread* thread);
NS_IMETHOD InitFromPLQueue(PLEventQueue* aQueue);
NS_IMETHOD EnterMonitor();
NS_IMETHOD ExitMonitor();
NS_IMETHOD RevokeEvents(void* owner);
NS_IMETHOD GetPLEventQueue(PLEventQueue** aEventQueue);
NS_IMETHOD IsQueueOnCurrentThread(PRBool *aResult);
NS_IMETHOD StopAcceptingEvents();
// Helpers
static NS_METHOD Create(nsISupports* outer, const nsIID& aIID, void* *aInstancePtr);
static const nsCID& CID() { static nsCID cid = NS_EVENTQUEUE_CID; return cid; }
// nsPIEventQueueChain interface
NS_IMETHOD AppendQueue(nsIEventQueue *aQueue);
NS_IMETHOD Unlink();
NS_IMETHOD GetYoungest(nsIEventQueue **aQueue);
NS_IMETHOD GetYoungestActive(nsIEventQueue **aQueue);
NS_IMETHOD SetYounger(nsPIEventQueueChain *aQueue);
NS_IMETHOD SetElder(nsPIEventQueueChain *aQueue);
private:
PLEventQueue *mEventQueue;
PRBool mAcceptingEvents, // accept new events or pass them on?
mCouldHaveEvents; // accepting new ones, or still have old ones?
nsPIEventQueueChain *mYoungerQueue,
*mElderQueue;
void NotifyObservers(const char *aTopic);
void CheckForDeactivation() {
if (mCouldHaveEvents && !mAcceptingEvents && !PL_EventAvailable(mEventQueue)) {
mCouldHaveEvents = PR_FALSE;
Release();
}
}
};