[Haskell-cafe] concurrent haskell: thread priorities

From what i understand (correct me if I'm wrong): The threaded RT creates an OS thread for each CPU/core on the system and uses them to multiplex userland threads. These are context switched whenever they block/yield/gc and no priorities can be assigned. It seems like we could get some priority based scheduling (and still be slackers) if we allow marked green threads to be strictly associated with a specific OS thread (forkChildIO?). Its not a very good solution, but it seems easy to implement and would be nice for the few problems that really need priority based scheduling. How many of those problems involve having 1 thread running at high/realtime priority? Maybe most?