On Apr 15, 2007, at 8:23 PM, Spencer Janssen wrote:
parSequence_ xs = do
m <- newEmptyMVar
mapM_ (\x -> forkIO x >> putMVar m ()) xs
replicateM_ (length xs) (takeMVar m)
mapM_ above spawns (length xs) threads blocking on a single "lock",
right?
replicateM_ then makes sure that the lock is "unlocked" as many times
as threads spawned, right?
Since all the threads block on a single MVar how do they run in
parallel?
Thanks, Joel
--
http://wagerlabs.com/
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