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threadsafe object properties

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* libguile/objprop.c: Add locking around the properties weak hash, to
  avoid corrupting the whash.
This commit is contained in:
Andy Wingo 2010-08-28 11:57:51 -07:00
parent 35b6730879
commit f5e854388b
1 changed files with 19 additions and 5 deletions
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24
libguile/objprop.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996, 2000, 2001, 2003, 2006, 2008, 2009, 2010 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -36,13 +36,20 @@
*/
static SCM object_whash;
static scm_i_pthread_mutex_t whash_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER;
SCM_DEFINE (scm_object_properties, "object-properties", 1, 0, 0,
(SCM obj),
"Return @var{obj}'s property list.")
#define FUNC_NAME s_scm_object_properties
{
return scm_hashq_ref (object_whash, obj, SCM_EOL);
SCM ret;
scm_i_pthread_mutex_lock (&whash_mutex);
ret = scm_hashq_ref (object_whash, obj, SCM_EOL);
scm_i_pthread_mutex_unlock (&whash_mutex);
return ret;
}
#undef FUNC_NAME
@ -52,8 +59,13 @@ SCM_DEFINE (scm_set_object_properties_x, "set-object-properties!", 2, 0, 0,
"Set @var{obj}'s property list to @var{alist}.")
#define FUNC_NAME s_scm_set_object_properties_x
{
SCM handle = scm_hashq_create_handle_x (object_whash, obj, alist);
SCM handle;
scm_i_pthread_mutex_lock (&whash_mutex);
handle = scm_hashq_create_handle_x (object_whash, obj, alist);
SCM_SETCDR (handle, alist);
scm_i_pthread_mutex_unlock (&whash_mutex);
return alist;
}
#undef FUNC_NAME
@ -77,8 +89,9 @@ SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
{
SCM h;
SCM assoc;
scm_i_pthread_mutex_lock (&whash_mutex);
h = scm_hashq_create_handle_x (object_whash, obj, SCM_EOL);
SCM_CRITICAL_SECTION_START;
assoc = scm_assq (key, SCM_CDR (h));
if (SCM_NIMP (assoc))
SCM_SETCDR (assoc, value);
@ -87,7 +100,8 @@ SCM_DEFINE (scm_set_object_property_x, "set-object-property!", 3, 0, 0,
assoc = scm_acons (key, value, SCM_CDR (h));
SCM_SETCDR (h, assoc);
}
SCM_CRITICAL_SECTION_END;
scm_i_pthread_mutex_unlock (&whash_mutex);
return value;
}
#undef FUNC_NAME