| 1 | /* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
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| 2 | /* ***** BEGIN LICENSE BLOCK *****
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| 3 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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| 4 | *
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| 5 | * The contents of this file are subject to the Mozilla Public License Version
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| 6 | * 1.1 (the "License"); you may not use this file except in compliance with
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| 7 | * the License. You may obtain a copy of the License at
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| 8 | * http://www.mozilla.org/MPL/
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| 9 | *
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| 10 | * Software distributed under the License is distributed on an "AS IS" basis,
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| 11 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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| 12 | * for the specific language governing rights and limitations under the
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| 13 | * License.
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| 14 | *
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| 15 | * The Original Code is mozilla.org code.
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| 16 | *
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| 17 | * The Initial Developer of the Original Code is
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| 18 | * Netscape Communications Corporation.
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| 19 | * Portions created by the Initial Developer are Copyright (C) 1998
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| 20 | * the Initial Developer. All Rights Reserved.
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| 21 | *
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| 22 | * Contributor(s):
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| 23 | *
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| 24 | * Alternatively, the contents of this file may be used under the terms of
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| 25 | * either of the GNU General Public License Version 2 or later (the "GPL"),
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| 26 | * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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| 27 | * in which case the provisions of the GPL or the LGPL are applicable instead
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| 28 | * of those above. If you wish to allow use of your version of this file only
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| 29 | * under the terms of either the GPL or the LGPL, and not to allow others to
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| 30 | * use your version of this file under the terms of the MPL, indicate your
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| 31 | * decision by deleting the provisions above and replace them with the notice
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| 32 | * and other provisions required by the GPL or the LGPL. If you do not delete
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| 33 | * the provisions above, a recipient may use your version of this file under
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| 34 | * the terms of any one of the MPL, the GPL or the LGPL.
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| 35 | *
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| 36 | * ***** END LICENSE BLOCK ***** */
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| 37 |
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| 38 | #ifndef nsProxyRelease_h__
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| 39 | #define nsProxyRelease_h__
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| 40 |
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| 41 | #include "nsIEventQueueService.h"
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| 42 | #include "prmem.h"
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| 43 |
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| 44 | /**
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| 45 | * Ensures that the delete of a nsISupports object occurs on the target thread.
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| 46 | *
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| 47 | * @param target
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| 48 | * the target thread where the doomed object should be released.
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| 49 | * @param doomed
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| 50 | * the doomed object; the object to be released on the target thread.
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| 51 | * @param alwaysProxy
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| 52 | * normally, if NS_ProxyRelease is called on the target thread, then the
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| 53 | * doomed object will released directly. however, if this parameter is
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| 54 | * true, then a PLEvent will always be posted to the target thread and
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| 55 | * the release will happen when that PLEvent is handled.
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| 56 | */
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| 57 | NS_COM nsresult NS_ProxyRelease
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| 58 | (nsIEventTarget *target, nsISupports *doomed, PRBool alwaysProxy=PR_FALSE);
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| 59 |
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| 60 |
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| 61 | #define NS_IMPL_PROXY_RELEASE(_class) \
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| 62 | NS_IMETHODIMP_(nsrefcnt) _class::Release(void) \
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| 63 | { \
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| 64 | NS_PRECONDITION(0 != mRefCnt, "dup release"); \
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| 65 | nsrefcnt count = ASMAtomicDecU32((volatile uint32_t *)&mRefCnt); \
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| 66 | NS_LOG_RELEASE(this, count, #_class); \
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| 67 | \
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| 68 | if (count == 0) \
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| 69 | { \
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| 70 | mRefCnt = 1; /* stabilize */ \
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| 71 | PRBool callDirectly = PR_TRUE; \
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| 72 | static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID); \
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| 73 | nsCOMPtr<nsIEventQueueService> eventQService \
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| 74 | = do_GetService(kEventQueueServiceCID); \
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| 75 | NS_ASSERTION(eventQService, "event queue service is unavailable"); \
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| 76 | \
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| 77 | nsCOMPtr<nsIEventQueue> eventQ; \
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| 78 | if (eventQService) { \
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| 79 | eventQService->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eventQ)); \
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| 80 | if (eventQ) \
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| 81 | eventQ->IsOnCurrentThread(&callDirectly); \
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| 82 | } \
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| 83 | \
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| 84 | if (callDirectly) \
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| 85 | { \
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| 86 | NS_RELEASE(this); \
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| 87 | return 0; \
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| 88 | } \
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| 89 | PLEvent *event = new PLEvent; \
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| 90 | if (event == nsnull) \
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| 91 | { \
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| 92 | NS_ASSERTION(0, "Could not create a plevent. Deleting on wrong thread!"); \
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| 93 | NS_DELETEXPCOM(this); \
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| 94 | return 0; \
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| 95 | } \
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| 96 | \
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| 97 | PL_InitEvent(event, \
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| 98 | NS_STATIC_CAST(nsISupports*, this), \
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| 99 | ReleaseDestructorEventHandler, \
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| 100 | ReleaseDestructorDestroyHandler); \
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| 101 | \
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| 102 | eventQ->PostEvent(event); \
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| 103 | return 0; \
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| 104 | } \
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| 105 | return count; \
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| 106 | } \
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| 107 |
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| 108 |
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| 109 |
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| 110 |
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| 111 | #endif
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