res_pjsip: Make aor named lock a mutex.

The named aor lock was always being locked for writes so a rwlock adds no
benefit and may be slower because rwlocks are biased toward read locking.

Change-Id: I8c5c2c780eb30ce5441832257beeb3506fd12b28

main/named_locks.c

@@ -87,8 +87,8 @@ static void named_locks_shutdown(void)
 
 int ast_named_locks_init(void)
 {
-	named_locks = ao2_container_alloc_hash(0, 0, NAMED_LOCKS_BUCKETS, named_locks_hash, NULL,
+	named_locks = ao2_container_alloc_hash(AO2_ALLOC_OPT_LOCK_MUTEX, 0,
-		named_locks_cmp);
+		NAMED_LOCKS_BUCKETS, named_locks_hash, NULL, named_locks_cmp);
 	if (!named_locks) {
 		return -1;
 	}

res/res_pjsip/location.c

@@ -214,12 +214,12 @@ struct ao2_container *ast_sip_location_retrieve_aor_contacts(const struct ast_si
 	struct ao2_container *contacts;
 	struct ast_named_lock *lock;
 
-	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_RWLOCK, "aor", ast_sorcery_object_get_id(aor));
+	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_MUTEX, "aor", ast_sorcery_object_get_id(aor));
 	if (!lock) {
 		return NULL;
 	}
 
-	ao2_wrlock(lock);
+	ao2_lock(lock);
 	contacts = ast_sip_location_retrieve_aor_contacts_nolock(aor);
 	ao2_unlock(lock);
 	ast_named_lock_put(lock);
@@ -373,12 +373,12 @@ int ast_sip_location_add_contact(struct ast_sip_aor *aor, const char *uri,
 	int res;
 	struct ast_named_lock *lock;
 
-	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_RWLOCK, "aor", ast_sorcery_object_get_id(aor));
+	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_MUTEX, "aor", ast_sorcery_object_get_id(aor));
 	if (!lock) {
 		return -1;
 	}
 
-	ao2_wrlock(lock);
+	ao2_lock(lock);
 	res = ast_sip_location_add_contact_nolock(aor, uri, expiration_time, path_info, user_agent,
 		via_addr, via_port, call_id,
 		endpoint);

res/res_pjsip_registrar.c

@@ -525,12 +525,12 @@ static int register_aor(pjsip_rx_data *rdata,
 	struct ao2_container *contacts = NULL;
 	struct ast_named_lock *lock;
 
-	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_RWLOCK, "aor", aor_name);
+	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_MUTEX, "aor", aor_name);
 	if (!lock) {
 		return PJ_TRUE;
 	}
 
-	ao2_wrlock(lock);
+	ao2_lock(lock);
 	contacts = ast_sip_location_retrieve_aor_contacts_nolock(aor);
 	if (!contacts) {
 		ao2_unlock(lock);

res/res_pjsip_registrar_expire.c

@@ -44,7 +44,7 @@ static int expire_contact(void *obj, void *arg, int flags)
 	struct ast_sip_contact *contact = obj;
 	struct ast_named_lock *lock;
 
-	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_RWLOCK, "aor", contact->aor);
+	lock = ast_named_lock_get(AST_NAMED_LOCK_TYPE_MUTEX, "aor", contact->aor);
 	if (!lock) {
 		return 0;
 	}
@@ -53,7 +53,7 @@ static int expire_contact(void *obj, void *arg, int flags)
 	 * We need to check the expiration again with the aor lock held
 	 * in case another thread is attempting to renew the contact.
 	 */
-	ao2_wrlock(lock);
+	ao2_lock(lock);
 	if (ast_tvdiff_ms(ast_tvnow(), contact->expiration_time) > 0) {
 		ast_sip_location_delete_contact(contact);
 	}