I'm no judge of what's true about safe and unsafe, but this account of the system has at least to my ear the ring of authenticity:
http://blog.melding-monads.com/2011/10/24/concurrency-and-foreign-functions-in-the-glasgow-haskell-compiler/ The FFI section is short and readable. With respect to whether "unsafe" does or does not block other threads, I can never penetrate the verbiage about capabilities to know for sure what to expect in practice, but when I checked, in practice, "unsafe" blocks other threads. I use "safe" to avoid this. Donn _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
