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