public void Write(long checkpoint)
{
Interlocked.Exchange(ref _last, checkpoint);
}
public void reading_off_same_instance_gives_most_up_to_date_info() { var checkSum = new FileCheckpoint(Filename); checkSum.Write(0xDEAD); checkSum.Flush(); var read = checkSum.Read(); checkSum.Close(); Assert.AreEqual(0xDEAD, read); }