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异步学习-墨

 4 years ago
source link: http://blog.51cto.com/jinyudong/2074025
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异步会以多线程、异步I/O等形式运行。给一个程序入口,让它处理完当前过程之后,把处理结果送到这个入口,然后执行另一段程序——俗称回调。回调一般使用callback这个名称 同步:如排队买票。指令执行(排队)时间过长,就会造成阻塞.异步(多线程):如多窗口。多个异步流程之间相互独立,在不需要等待共享资源的情况下它们相互不会阻塞。内部仍然是同步的。异步(I/O):如各部门资料汇总,找人去跑腿

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