Handling closed channels.

closedchannel.go

package main

import (
	"fmt"
	"time"
)

func main() {
	c := make(chan string)

	go process(c)

	select {
	case b := <-c:
		fmt.Println(b)
	}

	close(c)
	go process(c)

	for {
		select {
		case b, ok := <-c:
			if ok {
				fmt.Println(b)
			} else {
				time.Sleep(100 * time.Millisecond)
				fmt.Println("time to say goodbye")
				return
			}
		}
	}

}

func process(c chan string) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("channel closed")
		}
	}()

	c <- "hello"
}