// This sample program demonstrates how to create goroutines and
// how the goroutine scheduler behaves with two logical processor.
package main

import (
	"fmt"
	"runtime"
	"sync"
)

// main is the entry point for all Go programs.
func main() {
	// Allocate two logical processors for the scheduler to use.
	runtime.GOMAXPROCS(2)

	// wg is used to wait for the program to finish.
	// Add a count of two, one for each goroutine.
	var wg sync.WaitGroup
	wg.Add(2)

	fmt.Println("Start Goroutines")

	// Declare an anonymous function and create a goroutine.
	go func() {
		// Schedule the call to Done to tell main we are done.
		defer wg.Done()

		// Display the alphabet three times.
		for count := 0; count < 3; count++ {
			for char := 'a'; char < 'a'+26; char++ {
				fmt.Printf("%c ", char)
			}
		}
	}()

	// Declare an anonymous function and create a goroutine.
	go func() {
		// Schedule the call to Done to tell main we are done.
		defer wg.Done()

		// Display the alphabet three times.
		for count := 0; count < 3; count++ {
			for char := 'A'; char < 'A'+26; char++ {
				fmt.Printf("%c ", char)
			}
		}
	}()

	// Wait for the goroutines to finish.
	fmt.Println("Waiting To Finish")
	wg.Wait()

	fmt.Println("\nTerminating Program")
}