1 回答
TA贡献1818条经验 获得超3个赞
1.发送数据到goroutine里面的ch2
package main
import (
"context"
"fmt"
"time"
)
func main() {
ch1 := make(chan struct{})
ch2 := make(chan struct{})
defer close(ch1)
defer close(ch2)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
defer cancel()
go func() {
time.Sleep(time.Second * 1)
ch1 <- struct{}{}
}()
loop:
for {
select {
case <-ctx.Done():
fmt.Println("timeout")
break loop
case <-ch1:
fmt.Println("ch1")
go func() {
ch2 <- struct{}{}
}()
case <-ch2:
fmt.Println("ch2")
}
}
}
或者
2. 使 ch2 缓冲
package main
import (
"context"
"fmt"
"time"
)
func main() {
ch1 := make(chan struct{})
ch2 := make(chan struct{}, 1)
defer close(ch1)
defer close(ch2)
ctx, cancel := context.WithTimeout(context.Background(), time.Second*3)
defer cancel()
go func() {
time.Sleep(time.Second * 1)
ch1 <- struct{}{}
}()
loop:
for {
select {
case <-ctx.Done():
fmt.Println("timeout")
break loop
case <-ch1:
fmt.Println("ch1")
ch2 <- struct{}{}
case <-ch2:
fmt.Println("ch2")
}
}
}
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