尝试多个channel同时触发时，select的表现：
package main import (
"fmt"
"time"
) func loop(ch chan int){
for i := ; i < ; i++ {
ch <- i
}
close(ch)
} func main() {
ch1 := make(chan int, )
ch2 := make(chan int, ) go loop(ch1)
go loop(ch2) for{
select{
case j, ok := <- ch2:
if false == ok {
goto End
}
fmt.Println("ch2", j) case i,ok := <- ch1:
if false == ok {
goto End
}
fmt.Println("ch1", i) case <-time.After( * time.Second):
fmt.Println("time's up")
goto End
}
} End:
fmt.Println("finish!") }
输出
ch1 0
ch1 1
ch1 2
ch1 3
ch1 4
ch1 5
ch1 6
ch1 7
ch1 8
ch1 9
finish!
package main import (
"fmt"
"time"
) func loop(ch chan int){
for i := ; i < ; i++ {
ch <- i
}
close(ch)
} func main() {
ch1 := make(chan int, )
ch2 := make(chan int, ) go loop(ch2)//把ch2的调度提到前面
go loop(ch1) for{
select{
case j, ok := <- ch2:
if false == ok {
goto End
}
fmt.Println("ch2", j) case i,ok := <- ch1:
if false == ok {
goto End
}
fmt.Println("ch1", i) case <-time.After( * time.Second):
fmt.Println("time's up")
goto End
}
} End:
fmt.Println("finish!") }
输出：
ch2 0
ch2 1
ch2 2
ch2 3
ch2 4
ch2 5
ch2 6
ch2 7
ch2 8
ch2 9
finish!
package main import (
"fmt"
"time"
"runtime"
) func loop(ch chan int){
for i := ; i < ; i++ {
runtime.Gosched()//给别的goroutine让渡出一些调度时间
ch <- i
}
close(ch)
} func main() {
ch1 := make(chan int, )
ch2 := make(chan int, ) go loop(ch2)
go loop(ch1) for{
select{
case j, ok := <- ch2:
if false == ok {
goto End
}
fmt.Println("ch2", j) case i,ok := <- ch1:
if false == ok {
goto End
}
fmt.Println("ch1", i) case <-time.After( * time.Second):
fmt.Println("time's up")
goto End
}
} End:
fmt.Println("finish!") }
输出：
ch2 0
ch1 0
ch2 1
ch1 1
ch2 2
ch1 2
ch2 3
ch1 3
ch2 4
ch1 4
ch2 5
ch1 5
ch2 6
ch1 6
ch2 7
ch1 7
ch2 8
ch1 8
ch2 9
finish!