Queue.Queue-like class without the busy-wait

[Paul Rubin]

Antoon Pardon <apardon at forel.vub.ac.be> writes:
> > I meant a semaphore to synchronize the queue when adding or removing
> > objects.
> 
> Last I looked there was a lock used for that.

OK, that amounts to the same thing.
 
> The loop is only for when you cant remove or add an element immediatly
> and there is a timeout.

> > Timeout would be handled with sigalarm or select.
> 
> How is select going to help? IMO you can't put a Queue in a select call.
> And it is doubtfull if working with sigalarm will do the trick.

You could open a socket to your own loopback port and then select on
it, or something like that.  The select call takes a timeout parameter.

> First of all is the problem the signal module in python is very limited.
> IIRC all signals are routed to the main thread. So breaking a lock
> by having the thread signaled is impossible in python.

A signal handler in the main thread could release a lock that the
thread is waiting on.