#7299: threadDelay broken in ghci, Mac OS X
------------------------+---------------------------------------------------
Reporter: tmcdonell | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 7.6.1 | Keywords:
Os: MacOS X | Architecture: Unknown/Multiple
Failure: GHCi crash | Testcase:
Blockedby: | Blocking:
Related: |
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`Control.Concurrent.threadDelay` fails in ghci on Mac OS X. Behaviour is
correct in compiled code. To reproduce, it is enough to just execute
`threadDelay` at the prompt.
Depending on the architecture, I get different behaviour:
* i386: 7.6.1 and 7.7.20121003: segmentation fault (11)
* x86_64: 7.6.1 and 7.7.20121003: executes without segfault, but there
is no actual delay.
This is on Mac OS X 10.7.5 and 10.8.2.
Correct behaviour for ghci-7.6.1-x86_64 on Ubuntu 12.04. Also fine on Mac
in the 7.4 series.
Example output:
{{{
Nightfall $ ghci
GHCi, version 7.6.1: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude > Foreign.Storable.sizeOf (undefined :: Int)
4
Prelude > Control.Concurrent.threadDelay (1000 * 1000)
Segmentation fault: 11
}}}
Sample program for the second case:
{{{
import Control.Concurrent
count :: Int -> IO ()
count n
| n <= 0 = return ()
| otherwise = do
putStrLn $ shows n "-ah-ha-ha"
threadDelay (1000 * 1000) -- 1 second
count (n-1)
main :: IO ()
main = count 10
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7299>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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