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authortv <tv@krebsco.de>2019-02-07 18:42:36 +0100
committertv <tv@krebsco.de>2019-02-07 18:54:59 +0100
commitfb5636483871fbafe9b286b377c339c8ddf8b4f8 (patch)
tree5016d6b38bff4b13856828ee385aaf7498d8e344 /src/Control/Concurrent/Extended.hs
initial commitv1.0.0-rc1
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diff --git a/src/Control/Concurrent/Extended.hs b/src/Control/Concurrent/Extended.hs
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+module Control.Concurrent.Extended
+ ( module Exports
+ , newChan
+ , newRef
+ , newRelay
+ , newSemaphore
+ ) where
+
+import Control.Arrow
+import Control.Concurrent as Exports hiding (newChan,readChan,writeChan)
+import qualified Control.Concurrent.Chan.Unagi as U
+import Data.IORef
+
+newChan :: IO (a -> IO (), IO a)
+newChan = (U.writeChan *** U.readChan) <$> U.newChan
+
+newRef :: a -> IO (a -> IO (), IO a)
+newRef v0 = (atomicWriteIORef &&& readIORef) <$> newIORef v0
+
+newRelay :: IO (a -> IO (), IO a)
+newRelay = (putMVar &&& takeMVar) <$> newEmptyMVar
+
+newSemaphore :: IO (IO (), IO ())
+newSemaphore = first ($()) <$> newRelay