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 "config.h"
  21
  22 #include "gsourceclosure.h"
  23 #include "gboxed.h"
  24 #include "genums.h"
  25 #include "gmarshal.h"
  26 #include "gvalue.h"
  27 #include "gvaluetypes.h"
  28
  29
  30 GType
  31 g_io_channel_get_type (void)
  32 {
  33   static GType our_type = 0;
  34
  35   if (our_type == 0)
  36     our_type = g_boxed_type_register_static ("GIOChannel",
  37                                              (GBoxedCopyFunc) g_io_channel_ref,
  38                                              (GBoxedFreeFunc) g_io_channel_unref);
  39
  40   return our_type;
  41 }
  42
  43 GType
  44 g_io_condition_get_type (void)
  45 {
  46   static GType etype = 0;
  47   if (etype == 0)
  48     {
  49       static const GFlagsValue values[] = {
  50         { G_IO_IN,   "G_IO_IN",   "in" },
  51         { G_IO_OUT,  "G_IO_OUT",  "out" },
  52         { G_IO_PRI,  "G_IO_PRI",  "pri" },
  53         { G_IO_ERR,  "G_IO_ERR",  "err" },
  54         { G_IO_HUP,  "G_IO_HUP",  "hup" },
  55         { G_IO_NVAL, "G_IO_NVAL", "nval" },
  56         { 0, NULL, NULL }
  57       };
  58       etype = g_flags_register_static ("GIOCondition", values);
  59     }
  60   return etype;
  61 }
  62
  63 /* We need to hand-write this marshaler, since it doesn't have an
  64  * instance object.
  65  */
  66 static void
  67 source_closure_marshal_BOOLEAN__VOID (GClosure     *closure,
  68                                       GValue       *return_value,
  69                                       guint         n_param_values,
  70                                       const GValue *param_values,
  71                                       gpointer      invocation_hint,
  72                                       gpointer      marshal_data)
  73 {
  74   GSourceFunc callback;
  75   GCClosure *cc = (GCClosure*) closure;
  76   gboolean v_return;
  77
  78   g_return_if_fail (return_value != NULL);
  79   g_return_if_fail (n_param_values == 0);
  80
  81   callback = (GSourceFunc) (marshal_data ? marshal_data : cc->callback);
  82
  83   v_return = callback (closure->data);
  84
  85   g_value_set_boolean (return_value, v_return);
  86 }
  87
  88 static gboolean
  89 io_watch_closure_callback (GIOChannel   *channel,
  90                            GIOCondition  condition,
  91                            gpointer      data)
  92 {
  93   GClosure *closure = data;
  94
  95   GValue params[2] = { { 0, }, { 0, } };
  96   GValue result_value = { 0, };
  97   gboolean result;
  98
  99   g_value_init (&result_value, G_TYPE_BOOLEAN);
 100   g_value_init (&params[0], G_TYPE_IO_CHANNEL);
 101   g_value_set_boxed (&params[0], channel);
 102
 103   g_value_init (&params[1], G_TYPE_IO_CONDITION);
 104   g_value_set_flags (&params[1], condition);
 105
 106   g_closure_invoke (closure, &result_value, 2, params, NULL);
 107
 108   result = g_value_get_boolean (&result_value);
 109   g_value_unset (&result_value);
 110   g_value_unset (&params[0]);
 111   g_value_unset (&params[1]);
 112
 113   return result;
 114 }
 115
 116 static gboolean
 117 source_closure_callback (gpointer data)
 118 {
 119   GClosure *closure = data;
 120   GValue result_value = { 0, };
 121   gboolean result;
 122
 123   g_value_init (&result_value, G_TYPE_BOOLEAN);
 124
 125   g_closure_invoke (closure, &result_value, 0, NULL, NULL);
 126
 127   result = g_value_get_boolean (&result_value);
 128   g_value_unset (&result_value);
 129
 130   return result;
 131 }
 132
 133 static void
 134 closure_callback_get (gpointer     cb_data,
 135                       GSource     *source,
 136                       GSourceFunc *func,
 137                       gpointer    *data)
 138 {
 139   GSourceFunc closure_callback = source->source_funcs->closure_callback;
 140
 141   if (!closure_callback)
 142     {
 143       if (source->source_funcs == &g_io_watch_funcs)
 144         closure_callback = (GSourceFunc)io_watch_closure_callback;
 145       else if (source->source_funcs == &g_timeout_funcs ||
 146                source->source_funcs == &g_idle_funcs)
 147         closure_callback = source_closure_callback;
 148     }
 149
 150   *func = closure_callback;
 151   *data = cb_data;
 152 }
 153
 154 static GSourceCallbackFuncs closure_callback_funcs = {
 155   (void (*) (gpointer)) g_closure_ref,
 156   (void (*) (gpointer)) g_closure_unref,
 157   closure_callback_get
 158 };
 159
 160 /**
 161  * g_source_set_closure:
 162  * @source: the source
 163  * @closure: a #GClosure
 164  *
 165  * Set the callback for a source as a #GClosure.
 166  *
 167  * If the source is not one of the standard GLib types, the @closure_callback
 168  * and @closure_marshal fields of the #GSourceFuncs structure must have been
 169  * filled in with pointers to appropriate functions.
 170  */
 171 void
 172 g_source_set_closure (GSource  *source,
 173                       GClosure *closure)
 174 {
 175   g_return_if_fail (source != NULL);
 176   g_return_if_fail (closure != NULL);
 177
 178   if (!source->source_funcs->closure_callback &&
 179       source->source_funcs != &g_io_watch_funcs &&
 180       source->source_funcs != &g_timeout_funcs &&
 181       source->source_funcs != &g_idle_funcs)
 182     {
 183       g_critical (G_STRLOC "closure can not be set on closure without GSourceFuncs::closure_callback\n");
 184       return;
 185     }
 186
 187   g_closure_ref (closure);
 188   g_closure_sink (closure);
 189   g_source_set_callback_indirect (source, closure, &closure_callback_funcs);
 190
 191   if (G_CLOSURE_NEEDS_MARSHAL (closure))
 192     {
 193       GClosureMarshal marshal = (GClosureMarshal)source->source_funcs->closure_marshal;
 194       if (!marshal)
 195         {
 196           if (source->source_funcs == &g_idle_funcs ||
 197               source->source_funcs == &g_timeout_funcs)
 198             marshal = source_closure_marshal_BOOLEAN__VOID;
 199           else if (source->source_funcs == &g_io_watch_funcs)
 200             marshal = g_cclosure_marshal_BOOLEAN__FLAGS;
 201         }
 202       if (marshal)
 203         g_closure_set_marshal (closure, marshal);
 204     }
 205 }