In computer programming , a suspended process that waits for a certain kind of event to occur , it is then automatically actuated , performs its job and either terminates or suspends itself in wait for the next event 程序設(shè)計中的一種被掛起的進(jìn)程,它等待某種事件發(fā)生,然后自動地被激活、執(zhí)行作業(yè),然后終止或?qū)⒆陨頀炱穑却乱皇录?