gistfile1.txt

package main

import (
	"os"
	"syscall"
	"time"
)

func main() {
	f, err := os.OpenFile("/Users/f/txaws.diff", syscall.O_RDONLY|syscall.O_EXLOCK, 0644)
	if err != nil {
		panic(err)
	}
	go func() {
		time.Sleep(10e9)
		f.Close()
	}()
	f2, err := os.OpenFile("/Users/f/txaws.diff", syscall.O_RDONLY|syscall.O_EXLOCK, 0644)
	if err != nil {
		panic(err)
	}
	f2.Close()
}