Golang - 如何合并多个通道？

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问题内容

尝试安排项目，将项目发送到“状态”通道以获取状态，然后将项目发送到“删除”通道以删除项目。我正在设置两个通道的大小，预计在项目删除完成后我会“完成”。看起来代码在执行“删除”之后就停止了，然后才“完成”。为什么我会收到“致命错误：所有 goroutine 都在睡觉 - 死锁！”就在“删除项目”之后和“完成”之前吗？哪个 goroutine 正在睡觉？

https://go.dev/play/p/w49nif5xngq

package main
import (
    "fmt"
    "time"
)

func main() {
    numbers := []int{1, 2, 4}
    for _, n := range numbers {
        fmt.Printf("Schedule and delete %d items.\n", n)
        statusChan := make(chan string, n)
        deleteChan := make(chan string, n)
        done := make(chan bool)

        go func(n int, statusChan chan<- string) {
            for i := 0; i < n; i++ {
                i := i

                go func(n int, statusChan chan<- string) {
                    fmt.Printf("Scheduling item number ... %d\n", i)
                    itemNum := fmt.Sprintf("item_num_%d\n", i)
                    time.Sleep(500 * time.Millisecond)
                    statusChan <- itemNum
                }(n, statusChan)
            }
        }(n, statusChan)

        go func(statusChan <-chan string, deleteChan chan<- string) {
            for itemNum := range statusChan {
                fmt.Printf("Checking status of item number ... %s\n", itemNum)
                time.Sleep(500 * time.Millisecond)
                deleteChan <- itemNum
            }
        }(statusChan, deleteChan)

        go func(deleteChan <-chan string, done chan<- bool) {
            for itemNum := range deleteChan {
                fmt.Printf("Delete item: %s", itemNum)
                time.Sleep(500 * time.Millisecond)
            }
            fmt.Printf("Done with scheduling and deleting %d item.\n", n)
            done <- true
        }(deleteChan, done)
        <-done
    }
}

正确答案

这似乎符合您的想法。我使用“***”作为“全部完成”信号。

package main
import (
    "fmt"
    "time"
)

func main() {
    numbers := []int{1, 2, 4}
    for _, n := range numbers {
        fmt.Printf("Schedule and delete %d items.\n", n)
        statusChan := make(chan string, n)
        deleteChan := make(chan string, n)
        done := make(chan bool)

        go func(n int, statusChan chan<- string) {
            for i := 0; i < n; i++ {
                fmt.Printf("Scheduling item number ... %d\n", i)
                itemNum := fmt.Sprintf("item_num_%d\n", i)
                time.Sleep(500 * time.Millisecond)
                statusChan <- itemNum
            }
            statusChan <- "***"
        }(n, statusChan)

        go func(statusChan <-chan string, deleteChan chan<- string) {
            for itemNum := range statusChan {
              fmt.Printf("Checking status of item number ... %s\n", itemNum)
              deleteChan <- itemNum
            }
        }(statusChan, deleteChan)

        go func(deleteChan <-chan string, done chan<- bool) {
            for itemNum := range deleteChan {
              if itemNum == "***" {
                break
              }
              fmt.Printf("Delete item: %s", itemNum)
            }
            fmt.Printf("Done with scheduling and deleting %d item.\n", n)
            done <- true
        }(deleteChan, done)
        <-done
    }
}

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