/
main.go
88 lines (72 loc) · 1.2 KB
/
main.go
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package main
import (
"fmt"
"math/rand"
"runtime"
"time"
)
func generateIntA(done chan struct{}) chan int {
ch := make(chan int, 5)
go func() {
Lable:
for {
select {
case ch <- rand.Int():
case <-done:
break Lable
}
}
close(ch)
}()
return ch
}
func generateIntB(done chan struct{}) chan int {
ch := make(chan int, 5)
go func() {
Lable:
for {
select {
case ch <- rand.Int():
case <-done:
break Lable
}
}
close(ch)
}()
return ch
}
func generateInt(done chan struct{}) chan int {
ch := make(chan int)
seed := make(chan struct{})
go func() {
randA := generateIntA(seed)
randB := generateIntB(seed)
Lable:
for {
select {
case ch <- <-randA:
case ch <- <-randB:
case <-done:
seed <- struct{}{}
seed <- struct{}{}
break Lable
}
}
close(ch)
}()
return ch
}
func main() {
rand.Seed(time.Now().Unix())
done := make(chan struct{})
ch := generateInt(done)
time.Sleep(1 * time.Second)
fmt.Println("NumGoroutine", runtime.NumGoroutine())
for i := 0; i < 10; i++ {
fmt.Println(<-ch)
}
// 通知生成器停止生产
done <- struct{}{}
time.Sleep(2 * time.Second)
fmt.Println("stop generate", runtime.NumGoroutine())
}