mirror of
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113 lines
6.3 KiB
C
113 lines
6.3 KiB
C
/* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsProxyRelease_h_
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#define nsProxyRelease_h__
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#include "nsIEventQueueService.h"
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#include "pratom.h"
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#include "prmem.h"
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/**
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* Ensures that the delete of a nsISupports object occurs on the target thread.
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*
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* @param target
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* the target thread where the doomed object should be released.
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* @param doomed
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* the doomed object; the object to be released on the target thread.
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* @param alwaysProxy
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* normally, if NS_ProxyRelease is called on the target thread, then the
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* doomed object will released directly. however, if this parameter is
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* true, then a PLEvent will always be posted to the target thread and
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* the release will happen when that PLEvent is handled.
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*/
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NS_COM nsresult NS_ProxyRelease
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(nsIEventTarget *target, nsISupports *doomed, PRBool alwaysProxy=PR_FALSE);
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#define NS_IMPL_PROXY_RELEASE(_class) \
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NS_IMETHODIMP_(nsrefcnt) _class::Release(void) \
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{ \
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NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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nsrefcnt count = PR_AtomicDecrement((PRInt32 *)&mRefCnt); \
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NS_LOG_RELEASE(this, count, #_class); \
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\
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if (count == 0) \
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{ \
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mRefCnt = 1; /* stabilize */ \
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PRBool callDirectly = PR_TRUE; \
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static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID); \
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nsCOMPtr<nsIEventQueueService> eventQService \
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= do_GetService(kEventQueueServiceCID); \
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NS_ASSERTION(eventQService, "event queue service is unavailable"); \
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\
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nsCOMPtr<nsIEventQueue> eventQ; \
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if (eventQService) { \
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eventQService->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eventQ)); \
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if (eventQ) \
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eventQ->IsOnCurrentThread(&callDirectly); \
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} \
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\
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if (callDirectly) \
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{ \
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NS_RELEASE(this); \
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return 0; \
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} \
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PLEvent *event = new PLEvent; \
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if (event == nsnull) \
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{ \
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NS_ASSERTION(0, "Could not create a plevent. Deleting on wrong thread!"); \
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NS_DELETEXPCOM(this); \
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return 0; \
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} \
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\
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PL_InitEvent(event, \
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NS_STATIC_CAST(nsISupports*, this), \
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ReleaseDestructorEventHandler, \
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ReleaseDestructorDestroyHandler); \
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\
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eventQ->PostEvent(event); \
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return 0; \
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} \
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return count; \
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} \
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#endif
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