Re: [Haskell-cafe] Why does sleep not work?

The POSIX sleep function is defined as: sleep() makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored. Sounds like a signal is arriving that is interrupting the sleep. -Corey O'Connor 2009/2/9 John Ky :

Hi Peter,

Source code: import System.IO import System.Posix

main = do putStrLn "Waiting for 5 seconds." sleep 5 -- doesn't sleep at all putStrLn "Done."

OS: Mac OS X 10.5

Compile command: ghc --threaded testsleep.hs

If I remove --threaded, then it does sleep.

Thanks,

-John

On Tue, Feb 10, 2009 at 8:59 AM, Peter Verswyvelen wrote:

...

Hi John, Which sleep are you using? From which module? Can you show the full source with import statements? Cheers, Peter 2009/2/9 John Ky

...

Hi Haskell Cafe,

I wrote very short program to sleep for 5 seconds compiled with the -threaded option in ghc on the Mac OS X 1.5.

I am finding that using the sleep function doesn't sleep at all, whereas using threadDelay does:

main = do putStrLn "Waiting for 5 seconds." threadDelay 5000000 -- works putStrLn "Done."

main = do putStrLn "Waiting for 5 seconds." sleep 5 -- doesn't sleep at all putStrLn "Done."

Anybody know what's happening?

Thanks

-John

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe