=head1 NAME memcached_behavior_get memcached_behavior_set =head1 LIBRARY C Client Library for memcached (libmemcached, -lmemcached) =head1 SYNOPSIS #include uint64_t memcached_behavior_get (memcached_st *ptr, memcached_behavior flag); memcached_return memcached_behavior_set (memcached_st *ptr, memcached_behavior flag, uint64_t data); =head1 DESCRIPTION libmemcached(3) behavior can be modified by use memcached_behavior_set(). Default behavior is the library strives to be quick and accurate. Some behavior, while being faster, can also result in not entirely accurate behavior (for instance, memcached_set() will always respond with C). memcached_behavior_get() takes a behavior flag and returns whether or not that behavior is currently enabled in the client. memcached_behavior_set() changes the value of a particular option of the client. It takes both a flag (listed below) and a value. For simple on or off options you just need to pass in a value of 1. Calls to memcached_behavior_set() will flush and reset all connections. =over 4 =item MEMCACHED_BEHAVIOR_NO_BLOCK Causes libmemcached(3) to use asychronous IO. This is the fastest transport available for storage functions. For read operations it is currently similar in performance to the non-blocking method (this is being looked into). =item MEMCACHED_BEHAVIOR_SND_TIMEOUT This sets the microsecond behavior of the socket against the SO_SNDTIMEO flag. In cases where you cannot use non-blocking IO this will allow you to still have timeouts on the sending of data. =item MEMCACHED_BEHAVIOR_RCV_TIMEOUT This sets the microsecond behavior of the socket against the SO_RCVTIMEO flag. In cases where you cannot use non-blocking IO this will allow you to still have timeouts on the reading of data. =item MEMCACHED_BEHAVIOR_TCP_NODELAY Turns on the no-delay feature for connecting sockets (may be faster in some environments). =item MEMCACHED_BEHAVIOR_HASH Makes the default hashing algorithm for keys use MD5. The value can be set to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, and MEMCACHED_HASH_FNV1A_32. The behavior for all hashes but MEMCACHED_HASH_DEFAULT is identitical to the Java driver written by Dustin Sallings. =item MEMCACHED_BEHAVIOR_DISTRIBUTION Using this you can enable different means of distributing values to servers. The default method is MEMCACHED_DISTRIBUTION_MODULA. You can enable consistent hashing by setting MEMCACHED_DISTRIBUTION_CONSISTENT. Consistent hashing delivers better distribution and allows servers to be added to the cluster with minimal cache losses. Currently MEMCACHED_DISTRIBUTION_CONSISTENT is an alias for the value MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA. =item MEMCACHED_BEHAVIOR_CACHE_LOOKUPS Memcached can cache named lookups so that DNS lookups are made only once. =item MEMCACHED_BEHAVIOR_SUPPORT_CAS 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_KETAMA Sets the default distribution to MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA and the hash to MEMCACHED_HASH_MD5. =item MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED Sets the default distribution to MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA with the weighted support. and the hash to MEMCACHED_HASH_MD5. =item MEMCACHED_BEHAVIOR_KETAMA_HASH Sets the hashing algorithm for host mapping on continuum. The value can be set to either MEMCACHED_HASH_DEFAULT, MEMCACHED_HASH_MD5, MEMCACHED_HASH_CRC, MEMCACHED_HASH_FNV1_64, MEMCACHED_HASH_FNV1A_64, MEMCACHED_HASH_FNV1_32, and MEMCACHED_HASH_FNV1A_32. =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. =item MEMCACHED_BEHAVIOR_USER_DATA This allows you to store a pointer to a specifc piece of data. This can be retrieved from inside of memcached_fetch_execute(). Cloning a memcached_st will copy the pointer to the clone. This was deprecated in 0.14 in favor of memcached_callback_set(3). This will be removed in 0.15. =item MEMCACHED_BEHAVIOR_BUFFER_REQUESTS Enabling buffered IO causes commands to "buffer" instead of being sent. Any action that gets data causes this buffer to be be sent to the remote connection. Quiting the connection or closing down the connection will also cause the buffered data to be pushed to the remote connection. =item MEMCACHED_BEHAVIOR_VERIFY_KEY Enabling this will cause libmemcached(3) to test all keys to verify that they are valid keys. =item MEMCACHED_BEHAVIOR_SORT_HOSTS Enabling this will cause hosts that are added to be placed in the host list in sorted order. This will defeat consisten hashing. =item MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT In non-blocking mode this changes the value of the timeout during socket connection. =item MEMCACHED_BEHAVIOR_BINARY_PROTOCOL Enable the use of the binary protocol. Please note that you cannot toggle this flag on an open connection. =back =head1 RETURN memcached_behavior_get() returns either the current value of the get, or 0 or 1 on simple flag behaviors (1 being enabled). memcached_behavior_set() returns failure or success. =head1 NOTES memcached_behavior_set() in version .17 was changed from taking a pointer to data value, to taking a uin64_t. =head1 HOME To find out more information please check: L =head1 AUTHOR Brian Aker, Ebrian@tangent.orgE =head1 SEE ALSO memcached(1) libmemcached(3) memcached_strerror(3) =cut