[Haskell-cafe] Re: -threaded

Ketil Malde wrote:

Simon Marlow writes:

...

Concurrency is supported just fine without -threaded. You need -threaded if you want to: : 3) write a multithreaded Haskell library or DLL

I thought -threaded (A.K.A. -smp, no?) only affected which runtime was used, and thus was a linking option. I do have a library that needs -smp, but as far as I knew, the onus would be on the *applications* to specify this when compiling/linking. Is that incorrect? Is there a way for a library to inform the application about this?

Sorry, I was a bit ambiguous there: for case (3) I mean a Haskell library that you intend to call from C, or some other foreign language, using multiple OS threads. You're absolutely right that for a Haskell library that you intend to call from Haskell, the -threaded option is used when the final program is linked, there's no way for the library itself to add it. Cheers, Simon