dect/asterisk
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make register_unref() return NULL so it is easy to cleanup

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the original pointer while calling the function.

on passing add some comments on one of the places where it
is used, and explain why it is safe there.

again, a no-op for practical purposes.


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@77654 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
rizzo 2007-07-29 00:06:35 +00:00
parent 3507ec0ea0
commit 7a29f51638
1 changed files with 10 additions and 8 deletions
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18
channels/chan_sip.c
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@ -1878,10 +1878,11 @@ static void unref_user(struct sip_user *user)
ASTOBJ_UNREF(user, sip_destroy_user);
}
static void registry_unref(struct sip_registry *reg)
static void *registry_unref(struct sip_registry *reg)
{
ast_debug(3, "SIP Registry %s: refcount now %d\n", reg->hostname, reg->refcount - 1);
ASTOBJ_UNREF(reg, sip_registry_destroy);
return NULL;
}
/*! \brief Add object reference to SIP registry */
@ -3531,7 +3532,7 @@ static void __sip_destroy(struct sip_pvt *p, int lockowner, int lockdialoglist)
if (p->registry) {
if (p->registry->call == p)
p->registry->call = NULL;
registry_unref(p->registry);
p->registry = registry_unref(p->registry);
}
/* Unlink us from the owner if we have one */
@ -7994,17 +7995,18 @@ static int sip_reg_timeout(void *data)
/* Unlink us, destroy old call. Locking is not relevant here because all this happens
in the single SIP manager thread. */
p = r->call;
if (p->registry) {
registry_unref(p->registry);
p->registry = NULL;
}
r->call = NULL;
p->needdestroy = 1;
/* Pretend to ACK anything just in case */
__sip_pretend_ack(p); /* XXX we need p locked, not sure we have */
/* decouple the two objects */
/* p->registry == r, so r has 2 refs, and the unref won't take the object away */
if (p->registry)
p->registry = registry_unref(p->registry);
r->call = dialog_unref(r->call);
}
/* If we have a limit, stop registration and give up */
if (global_regattempts_max && (r->regattempts > global_regattempts_max)) {
if (global_regattempts_max && r->regattempts > global_regattempts_max) {
/* Ok, enough is enough. Don't try any more */
/* We could add an external notification here...
steal it from app_voicemail :-) */