memcached_return_t rc= memcached_do(instance, buffer, (size_t)send_length, true);
if (no_reply or memcached_failed(rc))
memcached_return_t rc= memcached_do(instance, buffer, (size_t)send_length, true);
if (no_reply or memcached_failed(rc))
rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);
rc= memcached_response(instance, buffer, MEMCACHED_DEFAULT_COMMAND_SIZE, NULL);