widget/src/photon/nsToolkit.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   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 the GNU General Public License Version 2 or later (the "GPL"), or
  26  * 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 #include "nsToolkit.h"
  39 #include "nscore.h"
  40 #include "nsWidgetAtoms.h"
  41
  42 //
  43 // Static thread local storage index of the Toolkit
  44 // object associated with a given thread...
  45 //
  46 static PRUintn gToolkitTLSIndex = 0;
  47
  48 NS_IMPL_ISUPPORTS1(nsToolkit,nsIToolkit)
  49
  50 //-------------------------------------------------------------------------
  51 //
  52 // constructor
  53 //
  54 //-------------------------------------------------------------------------
  55 nsToolkit::nsToolkit()
  56 {
  57 }
  58
  59
  60 //-------------------------------------------------------------------------
  61 //
  62 // destructor
  63 //
  64 //-------------------------------------------------------------------------
  65 nsToolkit::~nsToolkit()
  66 {
  67   // Remove the TLS reference to the toolkit...
  68   PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
  69 }
  70
  71
  72 //-------------------------------------------------------------------------
  73 //
  74 //
  75 //-------------------------------------------------------------------------
  76 NS_METHOD nsToolkit::Init(PRThread *aThread)
  77 {
  78   nsWidgetAtoms::RegisterAtoms();
  79
  80   return NS_OK;
  81 }
  82
  83 //-------------------------------------------------------------------------
  84 //
  85 // Return the nsIToolkit for the current thread.  If a toolkit does not
  86 // yet exist, then one will be created...
  87 //
  88 //-------------------------------------------------------------------------
  89 NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
  90 {
  91   nsIToolkit* toolkit = nsnull;
  92   nsresult rv = NS_OK;
  93   PRStatus status;
  94
  95   // Create the TLS index the first time through...
  96   if (0 == gToolkitTLSIndex) {
  97     status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
  98     if (PR_FAILURE == status) {
  99       rv = NS_ERROR_FAILURE;
 100     }
 101   }
 102
 103   if (NS_SUCCEEDED(rv)) {
 104     toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);
 105
 106     //
 107     // Create a new toolkit for this thread...
 108     //
 109     if (!toolkit) {
 110       toolkit = new nsToolkit();
 111
 112       if (!toolkit) {
 113         rv = NS_ERROR_OUT_OF_MEMORY;
 114       } else {
 115         NS_ADDREF(toolkit);
 116         toolkit->Init(PR_GetCurrentThread());
 117         //
 118         // The reference stored in the TLS is weak.  It is removed in the
 119         // nsToolkit destructor...
 120         //
 121         PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
 122       }
 123     } else {
 124       NS_ADDREF(toolkit);
 125     }
 126     *aResult = toolkit;
 127   }
 128
 129   return rv;
 130 }