運(yùn)行 deadlock
package?main
import?(
???"fmt"
)
func?main()?{
???ch?:=?make(chan?string)
???for?i?:=?0;?i?<?5;?i++?{
??????go?printHello(i,?ch)
???}
???for?{
??????message?:=?<-ch
??????fmt.Println(message)
???}
}
func?printHello(i?int,?ch?chan?string)?{
???message?:=?fmt.Sprintf("groutine?%d?send?u?message",?i)
???fmt.Println(message)
???ch?<-?message
}以上是我運(yùn)行的代碼，執(zhí)行結(jié)果:
fatal?error:?all?goroutines?are?asleep?-?deadlock! groutine?4?send?u?message groutine?4?send?u?message goroutine?1?[chan?receive]: groutine?1?send?u?message main.main() groutine?1?send?u?message groutine?0?send?u?message /Users/donng/go/src/practice/cmd/hello-world/main.go:14?+0x9e groutine?2?send?u?message
2018-06-27
經(jīng)過(guò)測(cè)試找到問(wèn)題了，原文中用
???for?{????? ????message?:=?<-ch?????? ????fmt.Println(message)??? ???}這種寫(xiě)法，在 for 循環(huán)到最后， ch 沒(méi)有數(shù)據(jù)時(shí)，程序死鎖。
2018-06-27
我將接收部分修改為以下，就可以了，不過(guò)很奇怪為什么老師的 5000 個(gè)，沒(méi)有出現(xiàn)死鎖。
go?func(ch?chan?string)?{ ???for?{ ??????message?:=?<-ch ??????fmt.Println(message) ???} }(ch)