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Update channels.md #1557

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8 changes: 4 additions & 4 deletions src/advance-practice/channels.md
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Expand Up @@ -334,10 +334,10 @@ loop {

总之，在 Tokio 中我们必须要显式地引入并发和队列:

- `tokio::spawn`
- `select!`
- `join!`
- `mpsc::channel`
- `tokio::spawn` (生成新任务)
- `select!` (在多个 Future 中选择最先完成的一个)
- `join!` (等待多个 Future 全部完成)
- `mpsc::channel` (消息通道)

当这么做时，我们需要小心的控制并发度来确保系统的安全。例如，当使用一个循环去接收 TCP 连接时，你要确保当前打开的 `socket` 数量在可控范围内，而不是毫无原则的接收连接。 再比如，当使用 `mpsc::channel` 时，要设置一个缓冲值。

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