Created
January 1, 2018 03:22
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stop M sender N receiver using one channel
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package main | |
import ( | |
"fmt" | |
"math/rand" | |
"time" | |
) | |
const senderNum = 20 | |
const receiverNum = 7 | |
type t struct { | |
i int | |
senderNo int | |
} | |
var dataCh = make(chan t, 100) | |
var stopCh = make(chan struct{}) | |
func main() { | |
startReceiver() | |
startSender() | |
// let sender and receiver run 3 second | |
stopSendDataAfterNSecond(3) | |
fmt.Println("stop transmit data") | |
// block to wait | |
time.Sleep(10 * time.Second) | |
} | |
func startSender() { | |
for i := 0; i < senderNum; i++ { | |
go func(i int) { | |
for { | |
if stopped() { | |
fmt.Printf("sender[%d] stop\n", i) | |
return | |
} | |
dataCh <- t{i: rand.Int(), senderNo: i} | |
sleepMs(1, 2) | |
} | |
}(i) | |
} | |
} | |
func startReceiver() { | |
for i := 0; i < receiverNum; i++ { | |
go func(i int) { | |
for { | |
if stopped() { | |
for { | |
select { | |
case result := <-dataCh: | |
fmt.Printf("sender stop but data channel still have data, reveiver[%d] get %d from sender[%d]\n", i, result.i, result.senderNo) | |
default: | |
fmt.Printf("receiver[%d] stop\n", i) | |
return | |
} | |
} | |
} | |
<-dataCh | |
//result := <-dataCh | |
//fmt.Printf("reveiver[%d] get %d from sender[%d]\n", i, result.i, result.senderNo) | |
sleepMs(0, 10) | |
} | |
}(i) | |
} | |
} | |
func stopSendDataAfterNSecond(t int) { | |
time.Sleep(time.Duration(t) * time.Second) | |
close(stopCh) | |
} | |
func stopped() bool { | |
select { | |
case <-stopCh: | |
return true | |
default: | |
return false | |
} | |
} | |
func sleepMs(min, max int) { | |
t := rand.Intn(max-min) + min | |
time.Sleep(time.Duration(t) * time.Millisecond) | |
} |
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