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nsProxyRelease.h
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00001 /* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 3 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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00014  *
00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
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00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00037 
00038 #ifndef nsProxyRelease_h_
00039 #define nsProxyRelease_h__
00040 
00041 #include "nsIEventQueueService.h"
00042 #include "pratom.h"
00043 #include "prmem.h"
00044 
00058 NS_COM nsresult NS_ProxyRelease
00059     (nsIEventTarget *target, nsISupports *doomed, PRBool alwaysProxy=PR_FALSE);
00060 
00061 
00062 #define NS_IMPL_PROXY_RELEASE(_class)                                           \
00063 NS_IMETHODIMP_(nsrefcnt) _class::Release(void)                                  \
00064 {                                                                               \
00065   NS_PRECONDITION(0 != mRefCnt, "dup release");                                 \
00066   nsrefcnt count = PR_AtomicDecrement((PRInt32 *)&mRefCnt);                     \
00067   NS_LOG_RELEASE(this, count, #_class);                                         \
00068                                                                                 \
00069   if (count == 0)                                                               \
00070   {                                                                             \
00071     mRefCnt = 1; /* stabilize */                                                \
00072     PRBool callDirectly = PR_TRUE;                                              \
00073     static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);      \
00074     nsCOMPtr<nsIEventQueueService> eventQService                                \
00075       = do_GetService(kEventQueueServiceCID);                                   \
00076     NS_ASSERTION(eventQService, "event queue service is unavailable");          \
00077                                                                                 \
00078     nsCOMPtr<nsIEventQueue> eventQ;                                             \
00079     if (eventQService) {                                                        \
00080       eventQService->GetThreadEventQueue(NS_UI_THREAD, getter_AddRefs(eventQ)); \
00081       if (eventQ)                                                               \
00082         eventQ->IsOnCurrentThread(&callDirectly);                          \
00083     }                                                                           \
00084                                                                                 \
00085     if (callDirectly)                                                           \
00086     {                                                                           \
00087       NS_RELEASE(this);                                                         \
00088       return 0;                                                                 \
00089     }                                                                           \
00090     PLEvent *event = new PLEvent;                                               \
00091     if (event == nsnull)                                                        \
00092     {                                                                           \
00093       NS_ASSERTION(0, "Could not create a plevent. Deleting on wrong thread!"); \
00094       NS_DELETEXPCOM(this);                                                     \
00095       return 0;                                                                 \
00096     }                                                                           \
00097                                                                                 \
00098     PL_InitEvent(event,                                                         \
00099                  NS_STATIC_CAST(nsISupports*, this),                            \
00100                  ReleaseDestructorEventHandler,                                 \
00101                  ReleaseDestructorDestroyHandler);                              \
00102                                                                                 \
00103     eventQ->PostEvent(event);                                                   \
00104     return 0;                                                                   \
00105   }                                                                             \
00106   return count;                                                                 \
00107 }                                                                               \
00108 
00109 
00110 
00111            
00112 #endif