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Update Ch20 and optimize .gitignore

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Unisko PENG 2023-04-03 10:11:14 +08:00
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.gitignore vendored
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book
target
Cargo.lock
*.html

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src/Ch20_Final_Project_Building_a_Multithreaded_Web_Server.md
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@ -566,3 +566,13 @@ fn main() {
```
*清单 20-11：为每个 TCP 流生成一个新线程*
如同咱们在第 16 章中所学到的，`thread::spawn` 讲创建出一个新线程，并于随后在新线程中，运行那个闭包中的代码。当咱们运行此代码，并在浏览器中加载 `/sleep`，随后在另外两个浏览器 Tab 页中加载 `/`，咱们就会看到到 `/` 的请求就不必等待 `/sleep` 请求完毕了。不过，如同咱们曾提到过的，因为咱们正不带任何限制地构造新线程，而最终将使系统不堪重负。
#### 创建有限数目的线程
**Creating a Finite Number of Threads**