libmemcachedutil is a small and thread-safe client library that provides
extra functionality built on top of libmemcached.
Do not try to access an instance of "memcached_st" from multiple threads
at the same time. If you want to access memcached from multiple threads
you should either clone the "memcached_st", or use the memcached pool
implementation. see memcached_pool_create(3).