+size_t io_vector_total_size(libmemcached_io_vector_st* vector, const size_t number_of);
+
+bool memcached_io_write(memcached_server_write_instance_st ptr);
+
+ssize_t memcached_io_write(memcached_server_write_instance_st ptr,
+ const void *buffer, size_t length, bool with_flush);
+
+ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,
+ const struct libmemcached_io_vector_st *vector,
+ size_t number_of, bool with_flush);
+