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fix #4876
[ghc-base.git]
/
Control
/
Concurrent
/
SampleVar.hs
diff --git
a/Control/Concurrent/SampleVar.hs
b/Control/Concurrent/SampleVar.hs
index
c66241e
..
68e4b30
100644
(file)
--- a/
Control/Concurrent/SampleVar.hs
+++ b/
Control/Concurrent/SampleVar.hs
@@
-120,5
+120,5
@@
writeSampleVar (SampleVar svar) v = mask_ $ do
isEmptySampleVar :: SampleVar a -> IO Bool
isEmptySampleVar (SampleVar svar) = do
(readers, _) <- readMVar svar
- return (readers == 0)
+ return (readers <= 0)