When a channel is closed all buffered and blocked messages are proceed until the "range is finish

range-channels.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {
	var wg sync.WaitGroup
	ch := make(chan int, 100)

	wg.Add(2)

	go func() {
		defer wg.Done()
		for a := range ch {
			fmt.Println("Receive job in Worker 1", a)
			time.Sleep(time.Millisecond * 100)
		}
	}()
	go func() {
		defer wg.Done()
		for a := range ch {
			fmt.Println("Receive job in Worker 2", a)
			time.Sleep(time.Millisecond * 100)
		}
	}()

	for i := 0; i < 100; i++ {
		ch <- i
		fmt.Println("sent job", i)
	}

	close(ch)
	wg.Wait()
	fmt.Println("Done!")
}