Support CAS operations (this is not enabled by default at this point in the server since it imposes a slight performance penalty).
+=item MEMCACHED_BEHAVIOR_POLL_TIMEOUT
+
+Modify the timeout value that is used by poll(). The default value is -1. An signed int pointer must be passed to memcached_behavior_set() to change this value. For memcached_behavior_get() a signed int value will be cast and returned as the unsigned long long.
+
+
=back
=head1 RETURN