package main
import (
"fmt"
"time"
)
var ch chan int = make(chan int, 1)
func main() {
go aaa()
select {
case <-ch: //拿到鎖
fmt.Println("call")
case <-time.After(5 * time.Second): //超時5s
fmt.Println("5 sec call")
}
}
func aaa() {
time.Sleep(time.Second * 3)
ch <- 1
}