如下是一个简单的生产-消费的代码，当我们程序要退出，或者重启的时候，channel里面的数据会丢失掉。
大家在使用生产消费者的时候，是怎么处理的呢？
```
package main
import (
"fmt"
"os"
"os/signal"
"syscall"
"time"
)
var oriTasks chan int
var taskStage21 chan int
var taskStage22 chan int
var endTasks chan int
func init() {
oriTasks = make(chan int , 1000)
taskStage21 = make(chan int , 1000)
taskStage22 = make(chan int , 1000)
endTasks = make(chan int , 1000)
}
func main() {
// 模拟任务来源，一般从网络获取
go func() {
i := 0
for {
oriTasks <- i
i++
time.Sleep(10*time.Second)
}
}()
go consumerStage1()
go consumerStage21()
go consumerStage22()
go consumerStageEnd()
quit := make(chan os.Signal)
signal.Notify(quit, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
<-quit
}
func consumerStage1() {
for {
select {
case tasks := <-oriTasks:
if tasks %2 ==0 {
// do something ....
taskStage22 <- tasks
} else {
// do other something ...
taskStage22 <- tasks
}
}
}
}
func consumerStage21() {
for {
select {
case tasks := <-oriTasks:
// stage2-2 biz
endTasks <- tasks * 2
}
}
}
func consumerStage22() {
for {
select {
case tasks := <-oriTasks:
// stage2-3 biz
endTasks <- tasks * 4
}
}
}
func consumerStageEnd() {
for {
select {
case tasks := <-endTasks:
// end task biz
r := tasks +1
fmt.Println(r)
}
}
}
```
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