> at a guess the magic take put is: > > block ( do > a <- takeMVar x > putMVar x a > ) > return a
This doesn't prevent the race condition Conor mentioned. It only prevents the thread executing the above code from being interrupted by an asynchronous exception (i.e., Control-C, or another thread killing this one). The only way to prevents race conditions is through discipline (take then put is one example). A good way to enforce this discipline is to use withX-style combinators, and treat the put/take group of operations as primitives. A _______________________________________________ Haskell-Cafe mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell-cafe
