public void BeginWrite(long which)
{
RE.MaybeSwitch();
RE.Assert(!_reading.Contains(which), $"Read in progress during write at {which}");
RE.Assert(!_writing.Contains(which), $"Write in progress during write at {which}");
_writing.Add(which);
}
public void EndRead(long which)
{
RE.MaybeSwitch();
_reading.Remove(which);
RE.Assert(!_writing.Contains(which), $"Write in progress during read at {which}");
}