/
select.go
54 lines (46 loc) · 865 Bytes
/
select.go
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package main
import (
"fmt"
"math/rand"
"os"
"strconv"
"sync"
"time"
)
func gen(min, max int, createNumber chan int, end chan bool) {
time.Sleep(time.Second)
for {
select {
case createNumber <- rand.Intn(max-min) + min:
case <-end:
fmt.Println("Ended!")
// return
case <-time.After(4 * time.Second):
fmt.Println("time.After()!")
return
}
}
}
func main() {
rand.Seed(time.Now().Unix())
createNumber := make(chan int)
end := make(chan bool)
if len(os.Args) != 2 {
fmt.Println("Please give me an integer!")
return
}
n, _ := strconv.Atoi(os.Args[1])
fmt.Printf("Going to create %d random numbers.\n", n)
var wg sync.WaitGroup
wg.Add(1)
go func() {
gen(0, 2*n, createNumber, end)
wg.Done()
}()
for i := 0; i < n; i++ {
fmt.Printf("%d ", <-createNumber)
}
end <- true
wg.Wait()
fmt.Println("Exiting...")
}