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C/C++ Source or Header  |  2006-05-08  |  6.3 KB  |  113 lines
  1. /* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
  2. /* ***** BEGIN LICENSE BLOCK *****
  3.  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  4.  *
  5.  * The contents of this file are subject to the Mozilla Public License Version
  6.  * 1.1 (the "License"); you may not use this file except in compliance with
  7.  * the License. You may obtain a copy of the License at
  8.  * http://www.mozilla.org/MPL/
  9.  *
  10.  * Software distributed under the License is distributed on an "AS IS" basis,
  11.  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12.  * for the specific language governing rights and limitations under the
  13.  * License.
  14.  *
  15.  * The Original Code is mozilla.org code.
  16.  *
  17.  * The Initial Developer of the Original Code is
  18.  * Netscape Communications Corporation.
  19.  * Portions created by the Initial Developer are Copyright (C) 1998
  20.  * the Initial Developer. All Rights Reserved.
  21.  *
  22.  * Contributor(s):
  23.  *
  24.  * Alternatively, the contents of this file may be used under the terms of
  25.  * either of the GNU General Public License Version 2 or later (the "GPL"),
  26.  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  27.  * in which case the provisions of the GPL or the LGPL are applicable instead
  28.  * of those above. If you wish to allow use of your version of this file only
  29.  * under the terms of either the GPL or the LGPL, and not to allow others to
  30.  * use your version of this file under the terms of the MPL, indicate your
  31.  * decision by deleting the provisions above and replace them with the notice
  32.  * and other provisions required by the GPL or the LGPL. If you do not delete
  33.  * the provisions above, a recipient may use your version of this file under
  34.  * the terms of any one of the MPL, the GPL or the LGPL.
  35.  *
  36.  * ***** END LICENSE BLOCK ***** */
  37.  
  38. #ifndef nsProxyRelease_h_
  39. #define nsProxyRelease_h__
  40.  
  41. #include "nsIEventQueueService.h"
  42. #include "pratom.h"
  43. #include "prmem.h"
  44.  
  45. /**
  46.  * Ensures that the delete of a nsISupports object occurs on the target thread.
  47.  *
  48.  * @param target
  49.  *        the target thread where the doomed object should be released.
  50.  * @param doomed
  51.  *        the doomed object; the object to be released on the target thread.
  52.  * @param alwaysProxy
  53.  *        normally, if NS_ProxyRelease is called on the target thread, then the
  54.  *        doomed object will released directly.  however, if this parameter is
  55.  *        true, then a PLEvent will always be posted to the target thread and
  56.  *        the release will happen when that PLEvent is handled.
  57.  */
  58. NS_COM nsresult NS_ProxyRelease
  59.     (nsIEventTarget *target, nsISupports *doomed, PRBool alwaysProxy=PR_FALSE);
  60.  
  61.  
  62. #define NS_IMPL_PROXY_RELEASE(_class)                                           \
  63. NS_IMETHODIMP_(nsrefcnt) _class::Release(void)                                  \
  64. {                                                                               \
  65.   NS_PRECONDITION(0 != mRefCnt, "dup release");                                 \
  66.   nsrefcnt count = PR_AtomicDecrement((PRInt32 *)&mRefCnt);                     \
  67.   NS_LOG_RELEASE(this, count, #_class);                                         \
  68.                                                                                 \
  69.   if (count == 0)                                                               \
  70.   {                                                                             \
  71.     mRefCnt = 1; /* stabilize */                                                \
  72.     PRBool callDirectly = PR_TRUE;                                              \
  73.     static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);      \
  74.     nsCOMPtr<nsIEventQueueService> eventQService                                \
  75.       = do_GetService(kEventQueueServiceCID);                                   \
  76.     NS_ASSERTION(eventQService, "event queue service is unavailable");          \
  77.                                                                                 \
  78.     nsCOMPtr<nsIEventQueue> eventQ;                                             \
  79.     if (eventQService) {                                                        \
  80.       eventQService->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eventQ)); \
  81.       if (eventQ)                                                               \
  82.         eventQ->IsOnCurrentThread(&callDirectly);                          \
  83.     }                                                                           \
  84.                                                                                 \
  85.     if (callDirectly)                                                           \
  86.     {                                                                           \
  87.       NS_RELEASE(this);                                                         \
  88.       return 0;                                                                 \
  89.     }                                                                           \
  90.     PLEvent *event = new PLEvent;                                               \
  91.     if (event == nsnull)                                                        \
  92.     {                                                                           \
  93.       NS_ASSERTION(0, "Could not create a plevent. Deleting on wrong thread!"); \
  94.       NS_DELETEXPCOM(this);                                                     \
  95.       return 0;                                                                 \
  96.     }                                                                           \
  97.                                                                                 \
  98.     PL_InitEvent(event,                                                         \
  99.                  NS_STATIC_CAST(nsISupports*, this),                            \
  100.                  ReleaseDestructorEventHandler,                                 \
  101.                  ReleaseDestructorDestroyHandler);                              \
  102.                                                                                 \
  103.     eventQ->PostEvent(event);                                                   \
  104.     return 0;                                                                   \
  105.   }                                                                             \
  106.   return count;                                                                 \
  107. }                                                                               \
  108.  
  109.  
  110.  
  111.            
  112. #endif
  113.