Доп. запуск горутин из цикла результатов

test-goroutine.go

package main

import (
  "fmt"
  "time"
  //"math/rand"
)

func squares(i int, c chan int, semaphoreChan chan bool) {
  semaphoreChan <- true
  time.Sleep(time.Duration(10 * i) *  time.Millisecond)//time.Duration(rand.Intn(500)*i) 
  c <- i
  <- semaphoreChan
}

func main() {
  fmt.Println("main() started")
  c := make(chan int)
  semaphoreChan := make(chan bool, 9)
  defer func() {
    close(c)
    close(semaphoreChan)
  }()
  cnt := 0

  for i := 0; i < 10; i++ {
    go squares(i, c, semaphoreChan)
  }

  sum := 0
  for val := range c {
    fmt.Println(val)
    cnt++
    sum += val
    if cnt == 30 {
      break
    } else /*if val == 1*/ {
      go squares(val*5+1, c, semaphoreChan)
    }
    /*else {
      time.Sleep(300 * time.Millisecond)
      go squares(val*10, c, semaphoreChan)
    }*/
  }

  fmt.Println("main() stopped", sum)
}