This function is used to ask the server to kill a MariaDB thread specified by the processid parameter. This value must be retrieved by SHOW PROCESSLIST. If trying to kill the own connection mysql_thread_id() should be used.
Returns 0 on success, otherwise nonzero.
To stop a running command without killing the connection, use KILL QUERY. The mysql_kill() function only kills a connection; it doesn't free any memory - this must be done explicitly by calling mysql_close().
