#4802: 'current directory' is not thread local
---------------------------------+------------------------------------------
Reporter: tanakh | Owner:
Type: bug | Status: new
Priority: normal | Component: libraries/directory
Version: 7.0.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Documentation bug
---------------------------------+------------------------------------------
In a threaded code, the current directory is not thread local, even using
forkOS.
For example:
{{{
import System.Directory
import Control.Concurrent
main :: IO ()
main = do
print =<< getCurrentDirectory
forkOS $ do
setCurrentDirectory "a"
threadDelay $ 10^6
print =<< getCurrentDirectory
forkOS $ do
threadDelay $ 10^6
print =<< getCurrentDirectory
threadDelay $ 20*10^6
}}}
The output is:
{{{
$ ghc --make -threaded curdir.hs
[1 of 1] Compiling Main ( curdir.hs, curdir.o )
Linking curdir ...
$ ./curdir
"/home/hideyuki"
"/home/hideyuki/a"
"/home/hideyuki/a"
}}}
It seems to inherit the specification of pthread. It may be environment-
dependent behavior (At least, on Linux and Windows, same results are
given).
If the behavior like above is the specific, documents should be added to
setCurrentDirectory/getCurrentDirectory. It is very confusing.
Or if it is possible to wrap the behabior of 'current directory' to make
thread local in Haskell code, I hope to make it so.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4802>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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