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add comments explaining puzzling code

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Joey Hess 2018-03-15 14:47:54 -04:00
parent ed81762c86
commit 7d83502329
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4
Utility/Process/Transcript.hs
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@ -71,9 +71,13 @@ processTranscript'' cp input = do
return (transcript, code) return (transcript, code)
where where
mkreader h = do mkreader h = do
-- Start consuming the output immediately, because the
-- process may block on reading input until some
-- of its output is consumed.
s <- hGetContents h s <- hGetContents h
v <- newEmptyMVar v <- newEmptyMVar
void $ forkIO $ do void $ forkIO $ do
-- Wait for output to be fully consumed.
void $ E.evaluate (length s) void $ E.evaluate (length s)
putMVar v () putMVar v ()
return $ do return $ do