Mike On Wednesday 19 December 2007, Michael Sparks wrote: > The thing here all of these functions have in common is they are all > read-write on the state (eg creating non-pre-existing vars). So rather than > having separate read & write locks, I've decided on a single lock for > read-write.
That is reasonable. There can be performance improvements from using separate read/write locks under certain loads, but I doubt that is an issue here. > I agree generally speaking about using decorators, however, this is intended > to be used in Kamaelia's core concurrency framework "Axon". At present that > code is largely python 2.2.late compatible, meaning that it should be > portable to Nokia Series 60 phones as well as Jython. The other aspect is we > have very very minimal reimplementations of the core in Ruby & C++ (as well > as a shedskin compiled version), and I've even seen a Java reimplementation > of the core as well.... I see your problem. Decorators are not for you at the moment. > > I agree. Where possible we use 'pipe and filter' or 'message queue' > > patterns for inter-thread communication. We have a library based around the > > MASCOT design method that uses concepts of 'queues' and 'pools', which has > > proved very powerful for large multi-threaded applications. > > I'd not heard of MASCOT - I'll take a look into it. It sounds very similar to > what we currently do in Kamaelia. I suspect pools maybe similar to what we > call backplanes. You won't find much on MASCOT unfortunately: http://en.wikipedia.org/wiki/Modular_Approach_to_Software_Construction_Operation_and_Test gives you the bare bones but not much else. Although I currently work for the successor of the Royal Radar Establishment at Malvern, where the method was developed, I did not learn it here. I was taught it as part of my decree course at Aberystwyth in the late 80s. Anyone else out there still using MASCOT? Regards Richard -- QinetiQ B009 Woodward Building St. Andrews Road Malvern Worcs WR14 3PS Jabber: [EMAIL PROTECTED] PGPKey: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xA7DA9FD9 Key fingerprint = D051 A121 E7C3 485F 3C0E 1593 ED9E D868 A7DA 9FD9
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