New worker threads are spawned on as needed. You'll need as many of them as you have simultaneously-blocked foreign calls. If you have 2000 simultaneously-blocked foreign calls, you'll need 2000 OS threads to support them, which probably won't work. If you think you have only a handful of simultaneously-blocked foreign calls, but you still get "runaway worker threads", please do make a reproducible test case and file a bug report. Simon M will probably reply to Seth's qns about thread IDs (I assume you mean Haskell thread ID?) in due course. Once you get answers, can I ask either or both of you to type in what you learned to the GHC user-documentation Wiki? That way things improve! The place to start is here http://haskell.org/haskellwiki/GHC under "Collaborative documentation". There's a already a page for "Concurrency" and for "FFI", so you can add to those. Thanks Simon | -----Original Message----- | From: glasgow-haskell-users-bounces@haskell.org [mailto:glasgow-haskell-users-bounces@haskell.org] | On Behalf Of Bulat Ziganshin | Sent: 21 June 2006 07:00 | To: Seth Kurtzberg | Cc: glasgow-haskell-users@haskell.org | Subject: Re[2]: FFI: number of worker threads? | | Hello Seth, | | Wednesday, June 21, 2006, 7:18:48 AM, you wrote: | | | Seth and Li, look at http://www.cse.unsw.edu.au/~chak/haskell/ghc/comm/rts-libs/multi-thread. html | | it may answer some of your questions | | (page http://www.cse.unsw.edu.au/~chak/haskell/ghc/comm/ contains | commentaries about GHC internals) | | | > I have a related question. The docs state that in some | | >> The paper "Extending the Haskell FFI with Concurrency" mentioned the | | | -- | Best regards, | Bulat mailto:Bulat.Ziganshin@gmail.com | | _______________________________________________ | Glasgow-haskell-users mailing list | Glasgow-haskell-users@haskell.org | http://www.haskell.org/mailman/listinfo/glasgow-haskell-users