| Maybe, the forkOS/forkIO approach is flawed, but I think we | should only rule it out when we can provide a convincing | example where only the keyword approach would work, and where | we can't use combinators to achieve the same effect. Daan, There has been extended discussion on this stuff, which Wolfgang and Simon and I tried to boil out into a document. It's hard to say exactly what 'safe' or 'bound' exports, or whatever, might mean, so we give a little operational semantics. My hope is that the very same operational-semantic framework would serve to describe your system. Would you like to write its transition rules, in the same style? Then we could compare the two more easily. Without that, I am hard pressed to understand the implications of what you suggest, just as I was hard pressed to understand Wolfgang's proposal till we had it specified. You can find the document in the CVS respository in haskell-report/ffi/threads.tex Simon