Rob Shortt wrote:
Use a Twisted reactor for the main/event loop. This should make
freevo more responsive and keep it from blocking on stupid things
like network activity. It will also let us easily turn Freevo main
into a XML-RPC server for receiving communications from
recordserver.
It would also make it possible to spend more time searching bugs. Let
me explain: I may repeat myself but threads are bad. Remember the bug
where Aubin got a STOP event on each second mp3 he played. It worked
for me and was a threading bug I found after several hours. Or the bug
when playing stopped after 5 seconds? Again, it worked for me and was
a threading problem. I spent hours to find these bugs and tried to
remove all threads from Freevo. The two remaining threads are checked
spending hours of checking.
I agree, threading is a PITA, I dislike them too. I would like to see Freevo get rid of all multi-threading.
To make it worse: twisted uses threads I don't know about. I need to
I don't think the Twisted people like threading either. See:
http://www.twistedmatrix.com/documents/current/howto/async http://www.twistedmatrix.com/documents/current/howto/threading
So as conclusion: do not add a twisted main loop to Freevo. We may
need more time to keep us from blocking, but we save much more time
searching bugs.
The blocking is a pain and our main loop isn't so hot either (while 1: do something; sleep;). I would like to see improvements in both areas and using Twisted looks like a good solution.
At the university I work, we developed and use mbus (www.mbus.org). Since we all hate threads, it's 100% thread free and there is also a python interface. Communication over mbus is: secure, fast, language independent (C/C++/Perl/Python) and supports rpc based communication. A co-worker using Freevo now ordered a DVB-T card. As I told him we use twisted for the recordserver, he said he would try to find a better way.
That looks interesting, I'd like to take a look at it.
-Rob
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