add signature for registerDelay

diff --git a/GHC/Conc.lhs b/GHC/Conc.lhs
index fb5cc6e..0b6bc91 100644 (file)
--- a/GHC/Conc.lhs
+++ b/GHC/Conc.lhs
@@ -583,6 +583,7 @@ threadDelay time
        case delay# time# s of { s -> (# s, () #)
        }}
 
+registerDelay :: Int -> IO (TVar Bool)
 registerDelay usecs 
 #ifndef mingw32_HOST_OS
   | threaded = waitForDelayEventSTM usecs