libguile/objprop.c

   1 /*      Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009, 2010 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 handle;
  63
  64   scm_i_pthread_mutex_lock (&whash_mutex);
  65   handle = scm_hashq_create_handle_x (object_whash, obj, alist);
  66   SCM_SETCDR (handle, alist);
  67   scm_i_pthread_mutex_unlock (&whash_mutex);
  68
  69   return alist;
  70 }
  71 #undef FUNC_NAME
  72
  73 SCM_DEFINE (scm_object_property, "object-property", 2, 0, 0,
  74            (SCM obj, SCM key),
  75             "Return the property of @var{obj} with name @var{key}.")
  76 #define FUNC_NAME s_scm_object_property
  77 {
  78   SCM assoc;
  79   assoc = scm_assq (key, scm_object_properties (obj));
  80   return (SCM_NIMP (assoc) ? SCM_CDR (assoc) : SCM_BOOL_F);
  81 }
  82 #undef FUNC_NAME
  83
  84 SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
  85             (SCM obj, SCM key, SCM value),
  86             "In @var{obj}'s property list, set the property named @var{key}\n"
  87             "to @var{value}.")
  88 #define FUNC_NAME s_scm_set_object_property_x
  89 {
  90   SCM h;
  91   SCM assoc;
  92
  93   scm_i_pthread_mutex_lock (&whash_mutex);
  94   h = scm_hashq_create_handle_x (object_whash, obj, SCM_EOL);
  95   assoc = scm_assq (key, SCM_CDR (h));
  96   if (SCM_NIMP (assoc))
  97     SCM_SETCDR (assoc, value);
  98   else
  99     {
 100       assoc = scm_acons (key, value, SCM_CDR (h));
 101       SCM_SETCDR (h, assoc);
 102     }
 103   scm_i_pthread_mutex_unlock (&whash_mutex);
 104
 105   return value;
 106 }
 107 #undef FUNC_NAME
 108
 109
 110 void
 111 scm_init_objprop ()
 112 {
 113   object_whash = scm_make_weak_key_hash_table (SCM_UNDEFINED);
 114 #include "libguile/objprop.x"
 115 }
 116
 117
 118 /*
 119   Local Variables:
 120   c-file-style: "gnu"
 121   End:
 122 */