同步⼀异步串行通信中的同步异步是什么意思?能用生活中的话举个例子吗?

2024-12-01 19:03:54
推荐回答(1个)
回答1:

假设一家理发店有五个顾客都坐在理发椅上等待理发师来剪头发,而此时只有一个理发师,那理发师可以选择两种方式来为顾客理发:

方式一:一个一个的来。先为第一个顾客见好头发后,再为第二个,接着第三个。。。直到五个顾 客剪完了,那理发师就完成任务了,这就是同步。特点是当第一个顾客在剪头发时,其余都四个顾客必须要依次等待前一个剪完后才能轮到自己。

方式二:大家一起来。当理发师的理发技术已经达到登峰造极并且会凌波微步时,他可以以飞快的速度为每个顾客剪头发。五个顾客都在等待,理发师先帮第一个顾客剪0.1秒,然后迅速移到第二个顾客位子,帮第二个顾客剪0.1秒,然后第三个也是0.1秒。。。以此不断往复循环,直到所有顾客的头发都剪好为止,因为理发师服务的间隔时间很短,所以每个顾客都以为理发师是在单独为自己服务,这就是异步。虽然生活中不可能做到这样的事,但计算机可以做到,就像你用电脑一边听歌,一边聊天,一边看小说一样,此时电脑就像上述的理发师一样,“凌波微步”的为你服务,因为时间间隔很短,所以你根本感觉不到变化。

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