blob: 61daba03fae98f91880f50b62a026fdcbc0ed820 [file] [log] [blame]
// +build OMIT
package main
import (
"fmt"
"time"
"math/rand"
)
func waiter(i int, block, done chan struct{}) {
time.Sleep(time.Duration(rand.Intn(3000)) * time.Millisecond)
fmt.Println(i, "waiting...")
<-block // HL
fmt.Println(i, "done!")
done <- struct{}{}
}
func main() {
block, done := make(chan struct{}), make(chan struct{})
for i := 0; i < 4; i++ {
go waiter(i, block, done)
}
time.Sleep(5 * time.Second)
close(block) // HL
for i := 0; i < 4; i++ {
<-done
}
}
// endmain OMIT