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{- locking between threads
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Utility.ThreadLock where
import Control.Concurrent.MVar
type Lock = MVar ()
newLock :: IO Lock
newLock = newMVar ()
{- Runs an action with a lock held, so only one thread at a time can run it. -}
withLock :: Lock -> IO a -> IO a
withLock lock = withMVar lock . const
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