Ben Franksen wrote:
import Control.Concurrent import Control.Concurrent.Chan import Control.Monad
test = do c <- newChan forkIO $ forever $ do i <- readChan c print i writeChan c 1 threadDelay 1000000 isEmptyChan c >>= print
Test session:
ben@sarun[1]: .../hca/current > ghci Bug5.hs GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. [1 of 1] Compiling Main ( Bug5.hs, interpreted ) Ok, modules loaded: Main. *Main> test 1
Correction: This is not a deadlock, technically speaking. I still think isEmptyChan should not block indefinitely only because some reader is blocked on an empty chan. Cheers Ben