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Astobj2: Add ao2_weakproxy_ref_object function.

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This function allows code to run ao2_ref against the real
object associated with a weakproxy.  It is useful when
all of the following conditions are true:
* You have a pointer to weakproxy.
* You do not have or need a pointer to the real object.
* You need to ensure the real object exists and is not
  destroyed during a process.

In this case it's wasteful to store a pointer to the real
object just for the sake of releasing it later.

Change-Id: I38a319b83314de75be74207a8771aab269bcca46
This commit is contained in:
Corey Farrell
2015-04-29 00:35:22 -04:00
parent ed5715eb39
commit c9c03998cc
3 changed files with 72 additions and 0 deletions
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27
main/astobj2.c
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@@ -836,6 +836,33 @@ int __ao2_weakproxy_set_object(void *weakproxy, void *obj, int flags,
return ret;
}
int __ao2_weakproxy_ref_object(void *weakproxy, int delta, int flags,
const char *tag, const char *file, int line, const char *func)
{
struct astobj2 *internal = __INTERNAL_OBJ_CHECK(weakproxy, file, line, func);
int ret = -1;
if (!internal || internal->priv_data.magic != AO2_WEAK) {
/* This method is meant to be run on weakproxy objects! */
return -2;
}
/* We have a weak object, grab lock. */
if (!(flags & OBJ_NOLOCK)) {
ao2_lock(weakproxy);
}
if (internal->priv_data.weakptr) {
ret = __ao2_ref(internal->priv_data.weakptr, delta, tag, file, line, func);
}
if (!(flags & OBJ_NOLOCK)) {
ao2_unlock(weakproxy);
}
return ret;
}
void *__ao2_weakproxy_get_object(void *weakproxy, int flags,
const char *tag, const char *file, int line, const char *func)
{