Created
July 20, 2021 03:40
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package main | |
import ( | |
"fmt" | |
"sync" | |
) | |
func main() { | |
wg := new(sync.WaitGroup) //create a wait group | |
wg.Add(3) // we know we are going to wait for two go routines | |
numberCh := make(chan int, 50) | |
errCh := make(chan error) | |
go func(wg *sync.WaitGroup) { | |
defer wg.Done() // first one done | |
for i := 1; i <= 50; i++ { | |
if i == 30 { | |
errCh <- fmt.Errorf("30 is not allowed") | |
close(numberCh) // because we are no longer sending to this channel, we should close this channel | |
break | |
} | |
numberCh <- i | |
fmt.Println(fmt.Sprintf("sending %d", i)) | |
} | |
}(wg) // passing the waitGroup, so that we can make it as done, when time comes | |
go func(wg *sync.WaitGroup) { | |
defer wg.Done() // first one done | |
for j := 1; j <= 50; j++ { | |
number := <-numberCh | |
fmt.Println(fmt.Sprintf("receiving %d", number)) | |
} | |
}(wg) // passing the waitGroup, so that we can make it as done, when time comes | |
go func(wg *sync.WaitGroup) { | |
defer wg.Done() | |
err := <-errCh | |
if err != nil { | |
fmt.Println("errored") | |
close(errCh) | |
} | |
}(wg) | |
wg.Wait() | |
} |
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