channel-synchronization.go

package main

import (
	"fmt"
	"time"
)

func worker(done chan bool) {
	fmt.Println("working...")
	time.Sleep(time.Second)
	fmt.Println("done")
	done <- true
}

func main() {
	done := make(chan bool, 1) // Start a worker goroutine, giving it the channel to notify on.

	go worker(done)
	//Block until we receive a notification from the worker on the channel.
	<-done
}

// This is the function we’ll run in a goroutine.
// The done channel will be used to notify another goroutine that this
// function’s work is done.
// Send a value to notify that we’re done.

// If you removed the <- done line from this program,
// the program would exit before the worker even started.