英文:
throw: all goroutines are asleep - deadlock
问题
给定以下简单的Go程序
package mainimport ("fmt")func total(ch chan int) {res := 0for iter := range ch {res += iter}ch <- res}func main() {ch := make(chan int)go total(ch)ch <- 1ch <- 2ch <- 3fmt.Println("Total is ", <-ch)}
我想知道为什么会出现以下错误信息
throw: all goroutines are asleep - deadlock!
谢谢
英文:
Given the following simple Go program
package mainimport ("fmt")func total(ch chan int) {res := 0for iter := range ch {res += iter}ch <- res}func main() {ch := make(chan int)go total(ch)ch <- 1ch <- 2ch <- 3fmt.Println("Total is ", <-ch)}
I am wondering if someone can enlighten me as to why I get
throw: all goroutines are asleep - deadlock!
thank you
答案1
得分: 34
由于您从未关闭ch通道，因此范围循环将永远不会结束。
您不能在同一个通道上发送结果。解决方案是使用另一个通道。
您的程序可以像这样进行调整：
package mainimport ("fmt")func total(in chan int, out chan int) {res := 0for iter := range in {res += iter}out <- res // 发送结果}func main() {ch := make(chan int)rch := make(chan int)go total(ch, rch)ch <- 1ch <- 2ch <- 3close (ch) // 这将结束total函数中的循环result := <- rch // 等待total给出结果fmt.Println("总和为", result)}
英文:
As you never close the ch channel, the range loop will never finish.
You can't send back the result on the same channel. A solution is to use a different one.
Your program could be adapted like this :
package mainimport ("fmt")func total(in chan int, out chan int) {res := 0for iter := range in {res += iter}out <- res // sends back the result}func main() {ch := make(chan int)rch := make(chan int)go total(ch, rch)ch <- 1ch <- 2ch <- 3close (ch) // this will end the loop in the total functionresult := <- rch // waits for total to give the resultfmt.Println("Total is ", result)}
答案2
得分: -3
这也是正确的。
package mainimport "fmt"func main() {c := make(chan int)go do(c)c <- 1c <- 2// close(c)fmt.Println("Total is ", <-c)}func do(c chan int) {res := 0// for v := range c {// res = res + v// }for i := 0; i < 2; i++ {res += <-c}c <- resfmt.Println("something")}
英文:
This is also right.
package mainimport "fmt"func main() {c := make(chan int)go do(c)c <- 1c <- 2// close(c)fmt.Println("Total is ", <-c)}func do(c chan int) {res := 0// for v := range c {// res = res + v// }for i := 0; i < 2; i++ {res += <-c}c <- resfmt.Println("something")}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论