f.go

package main

import (
  "net/http"
)

func doRequests(url string, num uint16) {
  ch := make(chan bool, num)
  var i uint16 = 0
  for ; i < num; i++ {
    go func() {
      http.Get(url)
      ch <- true
    }()
  }
  var resps = num
  for {
    select {
      case <- ch:
	resps--
	if resps == 0 { return }
    }
  }
}

func main() {
  doRequests("http://google.com", 300)
}