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reference increment and decrement is now atomic (when using a GCC compatible compiler), which allows passing json objects between threads

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This commit is contained in:
Emiel Bruijntjes
2015-11-27 16:49:32 +01:00
parent c97bbd3797
commit 23ee243113
1 changed files with 18 additions and 14 deletions
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32
json_object.c
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@@ -160,25 +160,29 @@ static int json_escape_str(struct printbuf *pb, const char *str, int len)
extern struct json_object* json_object_get(struct json_object *jso)
{
if (jso)
jso->_ref_count++;
if (!jso) return jso;
#if defined __GNUC__
__sync_add_and_fetch(&jso->_ref_count, 1);
#else
++jso->_ref_count;
#endif
return jso;
}
int json_object_put(struct json_object *jso)
{
if(jso)
{
jso->_ref_count--;
if(!jso->_ref_count)
{
if (jso->_user_delete)
jso->_user_delete(jso, jso->_userdata);
jso->_delete(jso);
return 1;
}
}
return 0;
if(!jso) return 0;
#if defined __GNUC__
if (__sync_fetch_and_sub(&jso->_ref_count, 1) > 0) return 0;
#else
if (--jso->_ref_count > 0) return 0;
#endif
if (jso->_user_delete)
jso->_user_delete(jso, jso->_userdata);
jso->_delete(jso);
return 1;
}