如何使用 gdb 调试 golang 代码来查看通道内的内容？

Question

例如，我有这个代码

http://play.golang.org/p/9U22NfrXeq

// A concurrent prime sieve

package main

// Send the sequence 2, 3, 4, ... to channel 'ch'.

func Generate(ch chan<- int) {

    for i := 2; ; i++ {

        ch <- i // Send 'i' to channel 'ch'.

    }

}

// Copy the values from channel 'in' to channel 'out',

// removing those divisible by 'prime'.

func Filter(in <-chan int, out chan<- int, prime int) {

    for {

        i := <-in // Receive value from 'in'.

        if i%prime != 0 {

            out <- i // Send 'i' to 'out'.

        }

    }

}

// The prime sieve: Daisy-chain Filter processes.

func main() {

    ch := make(chan int) // Create a new channel.

    go Generate(ch)      // Launch Generate goroutine.

    for i := 0; i < 10; i++ {

        prime := <-ch

        print(prime, "\n")

        ch1 := make(chan int)

        go Filter(ch, ch1, prime)

        ch = ch1

    }

}

如何查看频道内的内容？例如我想调试这一行：

prime := <-ch

通过在 gdb 中键入 'p ch' 只打印通道的地址。如何获取内容？

Answer 1

你只需要取消引用 ch。用一个非常小的程序：package mainfunc main() {&nbsp; &nbsp; ch := make(chan int, 10)&nbsp; &nbsp; ch <- 1&nbsp; &nbsp; ch <- 2&nbsp; &nbsp; ch <- 4&nbsp; &nbsp; <-ch}调试：(gdb) p *ch$1 = struct hchan<int> = {1, 2, 4}