Mastering Go - Second Edition

Creating multiple goroutines

In this subsection, you will learn how to create a variable number of goroutines. The program reviewed in this section is called create.go. It is going to be presented in four parts, and it will allow you to create a dynamic number of goroutines. The number of goroutines will be given as a command-line argument to the program, which uses the flag package to process its command-line argument.

The first code part of create.go is as follows:

package main 
 
import ( 
    "flag" 
    "fmt" 
    "time" 
) 

The second code segment from create.go contains the following Go code:

func main() { 
    n := flag.Int("n", 10, "Number of goroutines") 
    flag.Parse() 
 
    count := *n 
    fmt.Printf("Going to create %d goroutines.\n", count) 

The preceding code ...