Re: [Haskell-cafe] threadDelay delays less time than expected (Windows)

(86400000000 :: Integer) > (fromIntegral (maxBound :: Int)) If True, your machine (32-bit?) is probably overflowing the Int Tom

El 28 dic 2016, a las 08:20, Lian Hung Hon escribió:

Dear Haskellers,

I am baffled by a strange bug (?) with threadDelay on Windows. It delays for less time than expected (500 seconds vs expected 24 hours), and is consistently reproducible on my system. Can someone have a look (need some patience, ~8 minutes waiting), just to be sure? I glanced around trac but didn't find any related issues.

How to reproduce:

module Main where

import Data.Time import Control.Concurrent import Control.Monad

main :: IO () main = do _ <- forkIO thread getLine >>= print -- Just to keep the main thread running

thread :: IO () thread = forever $ do now <- getCurrentTime print now threadDelay 86400000000 print "done waiting"

Expected result: 2016-12-28 13:07:49.5113098 UTC ... (next timing should be the next day 2016-12-29)

Actual result: 2016-12-28 13:07:49.5113098 UTC "done waiting" 2016-12-28 13:16:10.2159485 UTC "done waiting" 2016-12-28 13:24:30.8735845 UTC "done waiting" 2016-12-28 13:32:51.5292203 UTC ...

System: Windows 7 Enterprise Service Pack 1, ghc 7.10.3

This seems specific to Windows, it doesn't appear on Debian 8. Help is appreciated!

Regards, Hon

Rant: It has cost me significant debugging time! Please tell me I made a rookie mistake or misread the docs somewhere! _______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.