Go Systems Programming

Creating a dynamic number of goroutines

This time, the number of goroutines that will be created will be given as a command-line argument: the name of the program will be dynamicGR.go and will be presented in four parts.

The first part of dynamicGR.go is the following:

package main 
 
import ( 
   "fmt" 
   "os" 
   "path/filepath" 
   "strconv" 
   "sync" 
) 

The second part of dynamicGR.go contains the following Go code:

func main() { 
   if len(os.Args) != 2 { 
         fmt.Printf("usage: %s integer\n",filepath.Base(os.Args[0])) 
         os.Exit(1) 
   } 
 
   numGR, _ := strconv.ParseInt(os.Args[1], 10, 64) 
   fmt.Printf("Going to create %d goroutines.\n", numGR) 
   var waitGroup sync.WaitGroup 
 
   var i int64 
   for i = 0; i < numGR; i++ { 
         waitGroup.Add(1) 

As you can see, the waitGroup.Add(1) statement ...