Subj : Re: Monitoring multiple sources via one condvar.
To   : comp.programming.threads
From : Markus Elfring
Date : Wed Jan 05 2005 08:28 pm

> So the actual question is if there exist any common practices to solve
> such a problem -- "monitor multiple sources in a consumer", and there
> are, where may I read them.

Can the following information sources help you?
-
http://wefts.sourceforge.net/wefts-apidoc-0.99c/classWefts_1_1RingBuffer.htm
l
- http://www.cs.wustl.edu/~schmidt/ACE-papers.html
- http://cabal-net.sourceforge.net/api_doc/


> Perhaps, I should create two different condvars -- but then I don't
> understand how to block on both of them at the same time.

I think that one approach is the application of separate condition variables
for each queue to manage if they are empty, filled or full.
How do you think about to use a third variable that combines the signals
from the others into a notification for the predicate to continue with a job
or task?

An other approach would be to register callback functions that perform a
notification about a specific condition.

Another view is presented in the discussion "Waiting on multiple
pthread_cond_t variables".
http://groups.google.de/groups?threadm=418A3688.8010503%40hp.com

Regards,
Markus

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