int c_zht_state_change_callback_std(ZHTClient_c zhtClient, const char *key,
		const char *expected_val, int lease) {

#ifdef IND_MUTEX
	LockGuard lock(&c_zht_state_change_callback_mutex);
#elif SHARED_MUTEX
	LockGuard lock(&c_zht_client_mutex);
#else
#endif

	ZHTClient * zhtcppClient = (ZHTClient *) zhtClient;

	string skey(key);
	string expectedval(expected_val);

	int rc = zhtcppClient->state_change_callback(skey, expectedval, lease);

	return rc;
}