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zhengdai1990
V2EX    Go 编程语言

go 问题请教

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  •   zhengdai1990 2020-12-15 17:09:11 +08:00 1750 次点击
    这是一个创建于 1767 天前的主题,其中的信息可能已经有所发展或是发生改变。

    https://play.golang.org/p/y_9-OQPwfsf 大佬们看这个,看下这个代码怎么改成 reply 通道内数据多久内未 receive 就触发超时,db 这个 goroutine 继续处理,而不是报错

    5 条回复
    linvon
        1
    linvon  
       2020-12-15 17:37:40 +08:00
    case reply := <-reads:
    select {
    case reply <- state:
    case <-time.After(time.Millisecond):
    }

    或者
    reply := make(chan int, 1) 使用带缓存 channel
    zhengdai1990
        2
    zhengdai1990  
    OP
       2020-12-15 19:08:50 +08:00
    多谢大佬
    zhengdai1990
        3
    zhengdai1990  
    OP
       2020-12-15 22:48:26 +08:00
    @linvon 有个疑问,嵌套在里面的这个 select 不是谁先满足就执行谁么,会执行那个 case time.After 么
    linvon
        4
    linvon  
       2020-12-16 10:12:04 +08:00
    @zhengdai1990 #3 reply channel 如果不带缓存,那么就会阻塞的,必须接受侧已经准备好了才能发送,如果接受侧没有准备那就无法执行,这个时候就会执行 time.After
    zhengdai1990
        5
    zhengdai1990  
    OP
       2020-12-16 11:19:36 +08:00
    @linvon 好吧,明白了
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