[go-nuts] is this code thread safety?

[sheepbao]

package main

import "time"
import "fmt"
import "sync/atomic"

func main() {
   die := make(chan struct{})
   i := int32(0)
   closed := func() {
       select {
       case <-die:
           atomic.AddInt32(&i, 1)
       default:
           close(die)
           fmt.Println("closed")
       }
   }
   N := 100000
   for i := 0; i < N; i++ {
       go closed()
   }
   time.Sleep(10 * time.Second)
   fmt.Println(atomic.LoadInt32(&i))
}


the close function is thread safety? how about call `closed` at the same 
time.

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