modified mothed of send connection to a waiting process

The old mothed : the emysql_conn_mgr process send a connection to waiting process ,but if the process has been dead , the connection will not return nerver. 
So, when emysql_conn_mgr process send a connection to one waiting process , should check the process if alive. If the process has been dead (beacuse timeout), emysql_conn_mgr should not send connection.