gobject/gsourceclosure.c

   1 /* GObject - GLib Type, Object, Parameter and Signal Library
   2  * Copyright (C) 2001 Red Hat, 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
  15  * Public 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 "gsourceclosure.h"
  21 #include "gboxed.h"
  22 #include "genums.h"
  23 #include "gmarshal.h"
  24 #include "gvalue.h"
  25 #include "gvaluetypes.h"
  26 #include "gobjectalias.h"
  27
  28 GType
  29 g_io_channel_get_type (void)
  30 {
  31   static GType our_type = 0;
  32
  33   if (our_type == 0)
  34     our_type = g_boxed_type_register_static ("GIOChannel",
  35                                              (GBoxedCopyFunc) g_io_channel_ref,
  36                                              (GBoxedFreeFunc) g_io_channel_unref);
  37
  38   return our_type;
  39 }
  40
  41 GType
  42 g_io_condition_get_type (void)
  43 {
  44   static GType etype = 0;
  45   if (etype == 0)
  46     {
  47       static const GFlagsValue values[] = {
  48         { G_IO_IN,   "G_IO_IN",   "in" },
  49         { G_IO_OUT,  "G_IO_OUT",  "out" },
  50         { G_IO_PRI,  "G_IO_PRI",  "pri" },
  51         { G_IO_ERR,  "G_IO_ERR",  "err" },
  52         { G_IO_HUP,  "G_IO_HUP",  "hup" },
  53         { G_IO_NVAL, "G_IO_NVAL", "nval" },
  54         { 0, NULL, NULL }
  55       };
  56       etype = g_flags_register_static ("GIOCondition", values);
  57     }
  58   return etype;
  59 }
  60
  61 /* We need to hand-write this marshaler, since it doesn't have an
  62  * instance object.
  63  */
  64 static void
  65 source_closure_marshal_BOOLEAN__VOID (GClosure     *closure,
  66                                       GValue       *return_value,
  67                                       guint         n_param_values,
  68                                       const GValue *param_values,
  69                                       gpointer      invocation_hint,
  70                                       gpointer      marshal_data)
  71 {
  72   GSourceFunc callback;
  73   GCClosure *cc = (GCClosure*) closure;
  74   gboolean v_return;
  75
  76   g_return_if_fail (return_value != NULL);
  77   g_return_if_fail (n_param_values == 0);
  78
  79   callback = (GSourceFunc) (marshal_data ? marshal_data : cc->callback);
  80
  81   v_return = callback (closure->data);
  82
  83   g_value_set_boolean (return_value, v_return);
  84 }
  85
  86 static gboolean
  87 io_watch_closure_callback (GIOChannel   *channel,
  88                            GIOCondition  condition,
  89                            gpointer      data)
  90 {
  91   GClosure *closure = data;
  92
  93   GValue params[2] = { { 0, }, { 0, } };
  94   GValue result_value = { 0, };
  95   gboolean result;
  96
  97   g_value_init (&result_value, G_TYPE_BOOLEAN);
  98   g_value_init (&params[0], G_TYPE_IO_CHANNEL);
  99   g_value_set_boxed (&params[0], channel);
 100
 101   g_value_init (&params[1], G_TYPE_IO_CONDITION);
 102   g_value_set_flags (&params[1], condition);
 103
 104   g_closure_invoke (closure, &result_value, 2, params, NULL);
 105
 106   result = g_value_get_boolean (&result_value);
 107   g_value_unset (&result_value);
 108   g_value_unset (&params[0]);
 109   g_value_unset (&params[1]);
 110
 111   return result;
 112 }
 113
 114 static gboolean
 115 source_closure_callback (gpointer data)
 116 {
 117   GClosure *closure = data;
 118   GValue result_value = { 0, };
 119   gboolean result;
 120
 121   g_value_init (&result_value, G_TYPE_BOOLEAN);
 122
 123   g_closure_invoke (closure, &result_value, 0, NULL, NULL);
 124
 125   result = g_value_get_boolean (&result_value);
 126   g_value_unset (&result_value);
 127
 128   return result;
 129 }
 130
 131 static void
 132 closure_callback_get (gpointer     cb_data,
 133                       GSource     *source,
 134                       GSourceFunc *func,
 135                       gpointer    *data)
 136 {
 137   GSourceFunc closure_callback = source->source_funcs->closure_callback;
 138
 139   if (!closure_callback)
 140     {
 141       if (source->source_funcs == &g_io_watch_funcs)
 142         closure_callback = (GSourceFunc)io_watch_closure_callback;
 143       else if (source->source_funcs == &g_timeout_funcs ||
 144                source->source_funcs == &g_idle_funcs)
 145         closure_callback = source_closure_callback;
 146     }
 147
 148   *func = closure_callback;
 149   *data = cb_data;
 150 }
 151
 152 static GSourceCallbackFuncs closure_callback_funcs = {
 153   (void (*) (gpointer)) g_closure_ref,
 154   (void (*) (gpointer)) g_closure_unref,
 155   closure_callback_get
 156 };
 157
 158 void
 159 g_source_set_closure (GSource  *source,
 160                       GClosure *closure)
 161 {
 162   g_return_if_fail (source != NULL);
 163   g_return_if_fail (closure != NULL);
 164
 165   if (!source->source_funcs->closure_callback &&
 166       source->source_funcs != &g_io_watch_funcs &&
 167       source->source_funcs != &g_timeout_funcs &&
 168       source->source_funcs != &g_idle_funcs)
 169     {
 170       g_critical (G_STRLOC "closure can not be set on closure without GSourceFuncs::closure_callback\n");
 171       return;
 172     }
 173
 174   g_closure_ref (closure);
 175   g_closure_sink (closure);
 176   g_source_set_callback_indirect (source, closure, &closure_callback_funcs);
 177
 178   if (G_CLOSURE_NEEDS_MARSHAL (closure))
 179     {
 180       GClosureMarshal marshal = (GClosureMarshal)source->source_funcs->closure_marshal;
 181       if (!marshal)
 182         {
 183           if (source->source_funcs == &g_idle_funcs ||
 184               source->source_funcs == &g_timeout_funcs)
 185             marshal = source_closure_marshal_BOOLEAN__VOID;
 186           else if (source->source_funcs == &g_io_watch_funcs)
 187             marshal = g_cclosure_marshal_BOOLEAN__FLAGS;
 188         }
 189       if (marshal)
 190         g_closure_set_marshal (closure, marshal);
 191     }
 192 }
 193
 194 #define __G_SOURCECLOSURE_C__
 195 #include "gobjectaliasdef.c"