Threading question .. am I doing this right?

[Robert Latest]

Greg Ewing wrote:
> * If more than one thread calls get_data() during the initial
> cache filling, it looks like only one of them will wait for
> the thread -- the others will skip waiting altogether and
> immediately return None.

Right. But that needs to be dealt with somehow. No data is no data.

> * Also if the first call to get_data() times out it will
> return None (although maybe that's acceptable if the caller
> is expecting it).

Right. Needs to be dealt with.

> * The caller of get_data() is getting an object that could
> be changed under it by a future update.

I don't think that's a problem. If it turns out to be one I'll create a copy of
the data while I hold the lock and pass that back.
>