On Tue, Feb 17, 2009 at 6:58 PM, Greg Ewing
Bruce Leban wrote:
That's a good reason to *not* support a test/change operation in regular sets as it may lead people to think (falsely) that it provide some kind of concurrency protection.
Well, perhaps it should provide concurrency protection. If it's implemented in C with the GIL held, it probably wouldn't be hard to make that guarantee.
That may depend on whether the hash or equality test is implemented in Python. Also, I've heard of lock-free thread-safe dict implementations in Java where it may not be so easy to decide whether you actually inserted something or not -- and it may or may not be there when you look for it again. All in all, I am now siding with Raymond -- let's leave well enough alone. Hopefully we can now retire this thread, I don't think there's much more that can be said that hasn't been said already. -- --Guido van Rossum (home page: http://www.python.org/~guido/)