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modify typo #53

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modify typo #53

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2 changes: 1 addition & 1 deletion content/42_21_goroutine.md
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## 21.1 并发

并发是在同一时间处理多件事情。并行是在同一时间做多件事情。并发的目的在于把当个 CPU 的利用率使用到最高。并行则需要多核 CPU 的支持。
并发是在同一时间处理多件事情。并行是在同一时间做多件事情。并发的目的在于把单个 CPU 的利用率使用到最高。并行则需要多核 CPU 的支持。

Go 语言在语言层面上支持了并发，goroutine是Go语言提供的一种用户态线程，有时我们也称之为协程。所谓的协程，某种程度上也可以叫做轻量线程，它不由系统而由应用程序创建和管理，因此使用开销较低（一般为4K）。我们可以创建很多的协程，并且它们跑在同一个内核线程之上的时候，就需要一个调度器来维护这些协程，确保所有的协程都能使用CPU，并且是尽可能公平地使用CPU资源。

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