使用通道将数据从一个 goroutine 传递到另一个 goroutine 时出现的问题-解网

问：

我已经能够开发以下代码，这些代码应该使用 go 通道将数据从一个例程传递到另一个例程：

package main

import (
    "fmt"
    "sync"
)

func generateNumbers(total int, wg *sync.WaitGroup) {
    defer wg.Done()
    ch :=make(chan int)

    sum :=0
    for idx := 1; idx <= total; idx++ {
        fmt.Printf("Generating number %d\n", idx)
        sum =sum+idx
        ch <- sum
    }
}

func printNumbers(wg *sync.WaitGroup, ch chan  int) {
    defer wg.Done()

    fmt.Printf("Sum is now",ch)
    for idx := 1; idx <= 3; idx++ {
        fmt.Printf("Printing number %d\n", idx)
    }
}

func main() {
    var wg sync.WaitGroup

    ch1 :=make(chan int)

    wg.Add(2)
    go printNumbers(&wg,ch1)
    go generateNumbers(3, &wg)

    fmt.Println("Waiting for goroutines to finish...")
    wg.Wait()
    fmt.Println("Done!")
}

我正在尝试将数据（ Value of Sum ）从generateNumbers传递给printNumbers例程。

但是我遇到了以下问题：

Waiting for goroutines to finish...
Generating number 1
Sum is now%!(EXTRA chan int=0xc000102060)Printing number 1
Printing number 2
Printing number 3
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [semacquire]:
sync.runtime_Semacquire(0xc000118270?)
    /usr/local/go/src/runtime/sema.go:62 +0x27
sync.(*WaitGroup).Wait(0x4ba3a8?)
    /usr/local/go/src/sync/waitgroup.go:116 +0x4b
main.main()
    /tmp/tgPhZuPV77.go:42 +0x12f

goroutine 19 [chan send]:
main.generateNumbers(0x3, 0x0?)
    /tmp/tgPhZuPV77.go:19 +0xf2
created by main.main
    /tmp/tgPhZuPV77.go:39 +0xe5
exit status 2

请帮忙，我是 Golang 的新手。

go 并发等待通道 goroutine

func generateNumbers(total int, wg *sync.WaitGroup, ch chan int) {
    defer wg.Done()

    sum := 0
    for idx := 1; idx <= total; idx++ {
        fmt.Printf("Generating number %d\n", idx)
        sum = sum + idx
        ch <- sum
    }
}

func printNumbers(wg *sync.WaitGroup, ch chan int) {
    defer wg.Done()

    fmt.Printf("Sum is now:\n")
    for idx := 1; idx <= 3; idx++ {
        sum := <-ch
        fmt.Printf("Printing number %d %d\n", idx, sum)
    }
}

func main() {
    var wg sync.WaitGroup

    ch1 := make(chan int)

    wg.Add(2)
    go printNumbers(&wg, ch1)
    go generateNumbers(3, &wg, ch1)

    fmt.Println("Waiting for goroutines to finish...")
    wg.Wait()
    fmt.Println("Done!")
}

上一个：Qt5：如何等待线程中的信号（带滤波器）？

下一个：Spring Boot 连接超时

使用通道将数据从一个 goroutine 传递到另一个 goroutine 时出现的问题

Issue in Passing data from one goroutine to another using channels

评论