atk/atkmisc.c

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2007 Sun Microsystems Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "atkmisc.h"
  21
  22 static void atk_misc_class_init (AtkMiscClass *klass);
  23
  24 GType
  25 atk_misc_get_type (void)
  26 {
  27   static GType type = 0;
  28
  29   if (!type)
  30     {
  31       static const GTypeInfo typeInfo =
  32       {
  33         sizeof (AtkMiscClass),
  34         (GBaseInitFunc) NULL,
  35         (GBaseFinalizeFunc) NULL,
  36         (GClassInitFunc) atk_misc_class_init,
  37         (GClassFinalizeFunc) NULL,
  38         NULL,
  39         sizeof (AtkMisc),
  40         0,
  41         (GInstanceInitFunc) NULL,
  42       } ;
  43       type = g_type_register_static (G_TYPE_OBJECT, "AtkMisc", &typeInfo, 0) ;
  44     }
  45   return type;
  46 }
  47
  48 static void
  49 atk_misc_class_init (AtkMiscClass *klass)
  50 {
  51   klass->threads_enter = NULL;
  52   klass->threads_leave = NULL;
  53 }
  54
  55 /**
  56  * atk_misc_threads_enter:
  57  * @misc: an AtkMisc instance for this application.
  58  *
  59  * Take the thread mutex for the GUI toolkit,
  60  * if one exists.
  61  * (This method is implemented by the toolkit ATK implementation layer;
  62  *  for instance, for GTK+, GAIL implements this via GDK_THREADS_ENTER).
  63  *
  64  * Since: 1.13
  65  *
  66  **/
  67 void
  68 atk_misc_threads_enter (AtkMisc *misc)
  69 {
  70   AtkMiscClass *klass;
  71
  72   if (misc == NULL)
  73     return;
  74
  75   klass = ATK_MISC_GET_CLASS (misc);
  76
  77   if (klass->threads_enter)
  78     {
  79       klass->threads_enter (misc);
  80     }
  81 }
  82
  83 /**
  84  * atk_misc_threads_leave:
  85  * @misc: an AtkMisc instance for this application.
  86  *
  87  * Release the thread mutex for the GUI toolkit,
  88  * if one exists. This method, and atk_misc_threads_enter,
  89  * are needed in some situations by threaded application code which
  90  * services ATK requests, since fulfilling ATK requests often
  91  * requires calling into the GUI toolkit.  If a long-running or
  92  * potentially blocking call takes place inside such a block, it should
  93  * be bracketed by atk_misc_threads_leave/atk_misc_threads_enter calls.
  94  * (This method is implemented by the toolkit ATK implementation layer;
  95  *  for instance, for GTK+, GAIL implements this via GDK_THREADS_LEAVE).
  96  *
  97  * Since: 1.13
  98  *
  99  **/
 100 void
 101 atk_misc_threads_leave (AtkMisc *misc)
 102 {
 103   AtkMiscClass *klass;
 104
 105   if (misc == NULL)
 106     return;
 107
 108   klass = ATK_MISC_GET_CLASS (misc);
 109
 110   if (klass->threads_leave)
 111     {
 112       klass->threads_leave (misc);
 113     }
 114 }
 115
 116 AtkMisc *atk_misc_instance = NULL;
 117
 118 /**
 119  * atk_misc_get_instance:
 120  *
 121  * Obtain the singleton instance of AtkMisc for this application.
 122  *
 123  * Since: 1.13
 124  *
 125  * Returns: The singleton instance of AtkMisc for this application.
 126  *
 127  **/
 128 const AtkMisc *
 129 atk_misc_get_instance (void)
 130 {
 131   return atk_misc_instance;
 132 }