什么术语;堵＆QUOT;编程是什么意思？ [英] What does the term "blocking" mean in programming?

问题描述

有人能提供一个门外汉定义和使用情况？

Could someone provide a layman definition and use case?

推荐答案

堵是指主叫等待，直到被叫方完成其处理。例如，从一个插座阻塞读等待，直到有数据返回;一个非阻塞读不，它只是返回是否有东西读的指示（通常是一个计数）。

"Blocking" means that the caller waits until the callee finishes its processing. For instance, a "blocking read" from a socket waits until there is data to return; a "non-blocking" read does not, it just returns an indication (usually a count) of whether there was something read.

您听到这个词大多是围绕在访问该不一定需要CPU注意力资源的API - I / O，例如。你也听到它在多线程：从线程A到B线程调用可能被设计成块（托起线程A），直到线程B达到国家有关处理，或者至少接受请求。 （还有最明显的例子是加盟，这通常意味着我，线程A，要等到线程B已终止 - 您使用退出多线程程序时。）

You hear the term mostly around APIs that access resources that don't necessarily require CPU attention -- I/O, for instance. You also hear it in multi-threading: A call from Thread A to Thread B might be designed to "block" (hold up Thread A) until Thread B achieves the relevant state to process or at least accept the request. (The most obvious example there being "join", which usually means "I, Thread A, want to wait until Thread B has terminated" -- you use that when exiting a multi-threaded program.)

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