libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include "libguile/_scm.h"
  26 #include "libguile/async.h"
  27 #include "libguile/hashtab.h"
  28 #include "libguile/alist.h"
  29 #include "libguile/root.h"
  30 #include "libguile/weaks.h"
  31
  32 #include "libguile/objprop.h"
  33 \f
  34
  35 /* {Object Properties}
  36  */
  37
  38 static SCM object_whash;
  39 static scm_i_pthread_mutex_t whash_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER;
  40
  41 SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
  42            (SCM obj),
  43             "Return @var{obj}'s property list.")
  44 #define FUNC_NAME s_scm_object_properties
  45 {
  46   SCM ret;
  47
  48   scm_i_pthread_mutex_lock (&whash_mutex);
  49   ret = scm_hashq_ref (object_whash, obj, SCM_EOL);
  50   scm_i_pthread_mutex_unlock (&whash_mutex);
  51
  52   return ret;
  53 }
  54 #undef FUNC_NAME
  55
  56
  57 SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
  58             (SCM obj, SCM alist),
  59             "Set @var{obj}'s property list to @var{alist}.")
  60 #define FUNC_NAME s_scm_set_object_properties_x
  61 {
  62   scm_i_pthread_mutex_lock (&whash_mutex);
  63   scm_hashq_set_x (object_whash, obj, alist);
  64   scm_i_pthread_mutex_unlock (&whash_mutex);
  65
  66   return alist;
  67 }
  68 #undef FUNC_NAME
  69
  70 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  71            (SCM obj, SCM key),
  72             "Return the property of @var{obj} with name @var{key}.")
  73 #define FUNC_NAME s_scm_object_property
  74 {
  75   SCM assoc;
  76   assoc = scm_assq (key, scm_object_properties (obj));
  77   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  78 }
  79 #undef FUNC_NAME
  80
  81 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  82             (SCM obj, SCM key, SCM value),
  83             "In @var{obj}'s property list, set the property named @var{key}\n"
  84             "to @var{value}.")
  85 #define FUNC_NAME s_scm_set_object_property_x
  86 {
  87   SCM alist;
  88   SCM assoc;
  89
  90   scm_i_pthread_mutex_lock (&whash_mutex);
  91   alist = scm_hashq_ref (object_whash, obj, SCM_EOL);
  92   assoc = scm_assq (key, alist);
  93   if (SCM_NIMP (assoc))
  94     SCM_SETCDR (assoc, value);
  95   else
  96     scm_hashq_set_x (object_whash, obj, scm_acons (key, value, alist));
  97   scm_i_pthread_mutex_unlock (&whash_mutex);
  98
  99   return value;
 100 }
 101 #undef FUNC_NAME
 102
 103
 104 void
 105 scm_init_objprop ()
 106 {
 107   object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
 108 #include "libguile/objprop.x"
 109 }
 110
 111
 112 /*
 113   Local Variables:
 114   c-file-style: "gnu"
 115   End:
 116 */