The issue of Go

main.go

package main

import (
  "fmt"
  "runtime"
  "time"
)

func cpuIntensive(p *int) {
  for i := 1; i <= 100000000000; i++ {
    *p = i
  }
}

func main() {
  runtime.GOMAXPROCS(1)

  x := 0
  go cpuIntensive(&x)

  time.Sleep(100 * time.Millisecond)

  fmt.Printf("x = %d.\n", x)
}