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lightning-sunbird  0.9+nobinonly
nsToolkit.cpp
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Lars Knoll <knoll@kde.org>
00024  *   Zack Rusin <zack@kde.org>
00025  *   John C. Griggs <johng@corel.com>
00026  *
00027  * Alternatively, the contents of this file may be used under the terms of
00028  * either the GNU General Public License Version 2 or later (the "GPL"), or
00029  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00030  * in which case the provisions of the GPL or the LGPL are applicable instead
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00038  *
00039  * ***** END LICENSE BLOCK ***** */
00040 
00041 #include "nscore.h"  // needed for 'nsnull'
00042 #include "nsToolkit.h"
00043 #include "nsGUIEvent.h"
00044 #include "plevent.h"
00045 
00046 // Static thread local storage index of the Toolkit
00047 // object associated with a given thread...
00048 static PRUintn gToolkitTLSIndex = 0;
00049 
00050 //-------------------------------------------------------------------------
00051 // constructor
00052 //-------------------------------------------------------------------------
00053 nsToolkit::nsToolkit()
00054 {
00055 }
00056 
00057 //-------------------------------------------------------------------------
00058 // destructor
00059 //-------------------------------------------------------------------------
00060 nsToolkit::~nsToolkit()
00061 {
00062   // Remove the TLS reference to the toolkit...
00063   PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
00064 }
00065 
00066 //-------------------------------------------------------------------------
00067 // nsISupports implementation macro
00068 //-------------------------------------------------------------------------
00069 NS_IMPL_ISUPPORTS1(nsToolkit, nsIToolkit)
00070 
00071 //-------------------------------------------------------------------------
00072 NS_IMETHODIMP nsToolkit::Init(PRThread *aThread)
00073 {
00074   return NS_OK;
00075 }
00076 
00077 //-------------------------------------------------------------------------
00078 // Return the nsIToolkit for the current thread.  If a toolkit does not
00079 // yet exist, then one will be created...
00080 //-------------------------------------------------------------------------
00081 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
00082 {
00083   nsIToolkit* toolkit = nsnull;
00084   nsresult rv = NS_OK;
00085   PRStatus status;
00086 
00087   // Create the TLS index the first time through...
00088   if (0 == gToolkitTLSIndex) {
00089     status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
00090     if (PR_FAILURE == status) {
00091       rv = NS_ERROR_FAILURE;
00092     }
00093   }
00094   if (NS_SUCCEEDED(rv)) {
00095     toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
00096 
00097     // Create a new toolkit for this thread...
00098     if (!toolkit) {
00099       toolkit = new nsToolkit();
00100 
00101       if (!toolkit) {
00102         rv = NS_ERROR_OUT_OF_MEMORY;
00103       }
00104       else {
00105         NS_ADDREF(toolkit);
00106         toolkit->Init(PR_GetCurrentThread());
00107 
00108         // The reference stored in the TLS is weak.  It is removed in the
00109         // nsToolkit destructor...
00110         PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
00111        }
00112     }
00113     else {
00114       NS_ADDREF(toolkit);
00115     }
00116     *aResult = toolkit;
00117   }
00118   return rv;
00119 }