Hello John, Friday, February 03, 2006, 12:00:32 PM, you wrote: JM> If we had a good standard poll/select interface in System.IO then we JM> actually could implement a lot of concurrency as a library with no JM> (required) run-time overhead. I'd really like to see such a thing get JM> into the standard. Well, mainly it would just be a really useful thing JM> to have in general. If others think it is a good idea I can try to come JM> up with a suitable API and submit it to the repo. i have delayed answering to this letter until i announced my Streams library. now i can say that such API already exists - in terms of my library you need just to write an transformer that intercepts vGetBuf/vPutBuf calls and pass them to the select/poll machinery. so you can write such transformer just now and every program that uses Streams will benefit from its usage. Converting programs that use Handles to using Streams should be also an easy task. of course, Streams library is not some standard just now, and moreover - it is not compatible with JHC. the greatest problem is what i using type classes extensions available in GHC/Hugs what is not in H98 standard. so, i'm interested in pushing Haskell' to accept most advanced possible extensions in this area and, of course, in actual implementing these extensions in the Haskell compilers. alternative way to make Streams available to wider range of Haskell compilers is to strip support of streams working in monads other that IO. if you can make select/poll transformer, at least for testing purposes, that will be really great. -- Best regards, Bulat mailto:bulatz@HotPOP.com