Simplify signals example

The signals example is overly complex, involving an unneeded go routine and an additional signal. This creates indirection making the code hard to understand.

The proposed change simplifies the code by removing the go routine and the additional signal, leaving the fundamental concept.

examples/signals/signals.go

@@ -18,29 +18,21 @@ func main() {
 
 	// Go signal notification works by sending `os.Signal`
 	// values on a channel. We'll create a channel to
-	// receive these notifications (we'll also make one to
+	// receive these notifications.
-	// notify us when the program can exit).
+	// **Note** that this channel is "buffered".
 	sigs := make(chan os.Signal, 1)
-	done := make(chan bool, 1)
 
 	// `signal.Notify` registers the given channel to
 	// receive notifications of the specified signals.
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
 
-	// This goroutine executes a blocking receive for
-	// signals. When it gets one it'll print it out
-	// and then notify the program that it can finish.
-	go func() {
-		sig := <-sigs
-		fmt.Println()
-		fmt.Println(sig)
-		done <- true
-	}()
-
-	// The program will wait here until it gets the
-	// expected signal (as indicated by the goroutine
-	// above sending a value on `done`) and then exit.
 	fmt.Println("awaiting signal")
-	<-done
+
+	// Because the `sigs` channel is buffered, the program
+	// will wait here until it gets the expected signal and
+	// then exit.
+	sig := <-sigs
+	fmt.Println()
+	fmt.Println(sig)
 	fmt.Println("exiting")
 }