package tick

import "syscall"
import "os"
import "errors"

func LockFile(file *os.File) error {
	h, err := syscall.LoadLibrary("kernel32.dll")
	if err != nil {
		return err
	}
	defer syscall.FreeLibrary(h)
	addr, err := syscall.GetProcAddress(h, "LockFile")
	if err != nil {
		return err
	}
	r0, _, _ := syscall.Syscall6(addr, 5, file.Fd(), 0, 0, 0, 1, 0)
	if 0 != int(r0) {
	    return nil
	}
	return errors.New("resource temporarily unavailable")
}