[Haskell-cafe] Safe/Unsafe calls with the GHC Foreign Function Interface

More questions from Rob regarding his mysterious bindings... So I've been reading the docs for the FFI, and it's my understanding that foreign functions imported as "unsafe" are faster, but they've got a problem with callbacks. From what I read, I believe that I should just make a foreign function safe if it sets up a callback; is this correct? Normally I wouldn't bother people with questions like this, but I'd rather be absolutely certain and avoid tracking down a strange bug later. Many thanks as always, Rob