1. func main() {
    2.     // Allocate 1 logical processors for the scheduler to use
    3.     runtime.GOMAXPROCS(1)
    4.     // runtime.GOMAXPROCS(runtime.NumCPU())
    5.     var wg sync.WaitGroup
    6.     wg.Add(2)
    7.     fmt.Println("Start Goroutines")
    9.     go func() {
    10.         defer wg.Done()
    11.         for count := 0; count < 3; count++ {
    12.             for char := 'a'; char < 'a'+26; char++ {
    13.                 fmt.Printf("%c ", char)
    14.             }
    15.             fmt.Println()
    16.         }
    17.     }()
    19.     go func() {
    20.         defer wg.Done()
    21.         for count := 0; count < 3; count++ {
    22.             for char := 'A'; char < 'A'+26; char++ {
    23.                 fmt.Printf("%c ", char)
    24.             }
    25.             fmt.Println()
    26.         }
    27.     }()
    28.     wg.Wait()
    29.     fmt.Println("Waiting To Finish")
    30.     fmt.Println("\nTerminating Program")
    31. }

    A WaitGroup is a counting semaphore that can be used to maintain a record of running goroutines.