+=head1 THREADS AND PROCESSES
+
+When using threads or forked processes it is important to keep an instance
+of C<memcached_st> per process or thread. Without creating your own locking
+structures you can no share a single C<memcached_st>. You can though call
+memcached_close(3) on a C<memcached_st> and then use the resulting cloned
+structure.
+