On Tue, 04 Mar 2008 22:12:00 -0700, Michael Torrie wrote: > Does anyone have any recommended ideas/ways of implementing a proper > control and status protocol for communicating with threads? I have a > program that spawns a few worker threads, and I'd like a good, clean way > of communicating the status of these threads back to the main thread. > Each thread (wrapped in a very simple class) has only a few states, and > progress levels in those states. And sometimes they can error out, > although if the main thread knew about it, it could ask the thread to > retry (start over). How would any of you do this? A callback method > that the thread can call (synchronizing one-way variables isn't a > problem)? A queue? How would the main thread check these things?
I implemented a generic library that could easily support these things: http://code.google.com/p/exscript/source/browse/trunk/lib/WorkQueue/ Basically, it's an asynchronous queue into which the jobs are added. The "MainLoop" class manages jobs (like, making sure that n jobs are running at the same time, and providing signals when jobs are done). One way to add a status to each job is by adding a status attribute to the Job class, in addition, a Job may emit a signal (using a simple signal/event mechanism such as this one: http://code.google.com/p/exscript/source/browse/trunk/lib/Exscript/ Trackable.py ) whenever a status changes, and have the MainLoop class fetch that. -Samuel -- http://mail.python.org/mailman/listinfo/python-list
