- Libraries - Haskell.org

ANNOUNCE: dataenc 0.12.1.0
by Magnus Therning 22 Apr '09

22 Apr '09

I've just uploaded version 0.12.1.0 of dataenc with the following (visible) changes compared to the previous version (0.12): - implementation of a bunch of new encodings: - xxencode - hexadecimal - quoted-printable - python escaping - url encoding - squashing of a bug in the yEncoding implementation that only manifested on 32-bit systems - an attempt to conform to the guidelines for the Haskell Platform regarding versioning and dependencies This release brings the full list of encodings to - Base16 - Base32 - Base32Hex - Base64 - Base64Url - Base85 - Hexadecimal - Python string escaping - quoted-printable - URL encoding - uuencoding - xxencoding - yEncoding The hackage page[1] now reads: Versions 0.9, 0.10.1, 0.10.2, 0.11, 0.11.1, 0.12, 0.12.1.0 Dependencies array (>=0.2.0 && <0.3), base (>=4.0.0 && <4.1), containers (>=0.2.0 && <0.3) License BSD3 Copyright Magnus Therning, 2007-2009 Author Magnus Therning Maintainer magnus(a)therning.org Category Codec Home page http://www.haskell.org/haskellwiki/Library/Data_encoding Upload date Wed Apr 22 19:40:22 UTC 2009 Uploaded by MagnusTherning /M [1]: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/dataenc -- Magnus Therning (OpenPGP: 0xAB4DFBA4) magnus＠therning．org Jabber: magnus＠therning．org http://therning.org/magnus identi.ca|twitter: magthe Haskell is an even 'redder' pill than Lisp or Scheme. -- PaulPotts

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Re: [Haskell-cafe] ANN: list-tries-0.0 - first release
by Martijn van Steenbergen 21 Apr '09

21 Apr '09

Matti Niemenmaa wrote: > In order to run properly, list-tries needs a version of 'containers' > that hasn't yet been released. I incorporated a little hack which makes > it compile even with 0.2, but some calls will fail by calling 'error': > 30 of my 1014 test cases do so. 1014 test cases?! Wow. :-) FYI, list-tries installed without any problems (with containers-0.2.0.0). Thanks, Martijn.

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NFData
by Sittampalam, Ganesh 20 Apr '09

20 Apr '09

Hi, NFData seems to be the "standard" deepseq-style class these days, but it lives in Control.Parallel.Strategies in the parallel package whereas it obviously has uses beyond this. Is there a case for moving it into its own package and module? I'd also like to add something like strictly :: (Monad m, NFData a) => m a -> m a strictly ma = do a <- ma rnf a `seq` return a The most important use for this would be to provide a standard way to do strict IO: strictly $ readFile "..." strictly $ hGetContents ... Thoughts? Cheers, Ganesh =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================

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ANN: time 1.1.2.4
by Ashley Yakeley 20 Apr '09

20 Apr '09

time 1.1.2.4 is available on Hackage. This version of time should compile on Windows. It's been tested on a Vista machine that didn't have cygwin, just the standard GHC install. No other changes have been made.

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Failure to install time package
by Neil Mitchell 20 Apr '09

20 Apr '09

Hi, Time is an important library, it got unbundled from GHC, and it seems Windows users can't install the time package! C:\Neil\hoogle>cabal install time --global Resolving dependencies... [1 of 1] Compiling Main ( C:\Users\Neil\AppData\Local\Temp\time-1.1. 2.32884\time-1.1.2.3\Setup.hs, C:\Users\Neil\AppData\Local\Temp\time-1.1.2.32884 \time-1.1.2.3\dist\setup\Main.o ) Linking C:\Users\Neil\AppData\Local\Temp\time-1.1.2.32884\time-1.1.2.3\dist\setu p\setup.exe ... Configuring time-1.1.2.3... setup.exe: sh: runGenProcess: does not exist (No such file or directory) cabal: Error: some packages failed to install: time-1.1.2.3 failed during the configure step. The exception was: exit: ExitFailure 1 C:\Neil\hoogle>ghc --version The Glorious Glasgow Haskell Compilation System, version 6.10.2 My guess is that it would work if I installed mingw, but that it hasn't been tested without. I consider this problem fatally serious - we may have managed to make GHC 6.10.2 unuseable for many Windows users... Thanks Neil

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unix-2.3.2.0 fails to install in ghc 6.10.1
by Ahn, Ki Yung 17 Apr '09

17 Apr '09

kyagrd@kyagrd:~$ uname -a Linux kyagrd 2.6.26-1-686 #1 SMP Sat Jan 10 18:29:31 UTC 2009 i686 GNU/Linux kyagrd@kyagrd:~$ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.10.1 kyagrd@kyagrd:~$ which ghc /usr/bin/ghc kyagrd@kyagrd:~$ ghc-pkg list /usr/lib/ghc-6.10.1/./package.conf: ALUT-2.1.0.0, Cabal-1.6.0.1, Diff-0.1.2, GLUT-2.1.1.2, HDBC-2.1.0, HDBC-postgresql-2.1.0.1, HGL-3.2.0.0, HUnit-1.2.0.3, OpenAL-1.3.1.1, OpenGL-2.2.1.1, QuickCheck-2.1.0.1, Stream-0.2.2, X11-1.4.5, X11-xft-0.3, array-0.2.0.0, arrows-0.4.1, base-3.0.3.0, base-4.0.0.0, binary-0.5, bytestring-0.9.1.4, cairo-0.10.0, cgi-3001.1.7.1, containers-0.2.0.0, convertible-1.0.2, directory-1.0.0.2, editline-0.2.1.0, fgl-5.4.2.2, filepath-1.1.0.1, gconf-0.10.0, (ghc-6.10.1), ghc-prim-0.1.0.0, gio-0.10.0, glade-0.10.0, glib-0.10.0, gstreamer-0.10.0, gtk-0.10.0, gtkglext-0.10.0, gtksourceview2-0.10.0, haskell-src-1.0.1.3, haskell98-1.0.1.0, hpc-0.5.0.2, hslogger-1.0.8, html-1.0.1.2, integer-0.1.0.0, irc-0.4.3, mtl-1.1.0.2, network-2.2.0.1, old-locale-1.0.0.1, old-time-1.0.0.1, packedstring-0.1.0.1, parallel-1.1.0.0, parsec-3.0.0, pretty-1.0.1.0, process-1.0.1.0, random-1.0.0.1, regex-base-0.93.1, regex-compat-0.92, regex-posix-0.93.1, rts-1.0, soegtk-0.10.0, stm-2.1.1.2, svgcairo-0.10.0, syb-0.1.0.0, syb-with-class-0.5.1, tagsoup-0.6, template-haskell-2.3.0.0, terminfo-0.3.0.1, time-1.1.2.3, unix-2.3.1.0, utf8-string-0.3.4, xhtml-3000.2.0.1, xmonad-0.8.1, xmonad-contrib-0.8.1, zlib-0.5.0.0 /home/kyagrd/.ghc/i386-linux-6.10.1/package.conf: Cabal-1.6.0.1, Cabal-1.6.0.2, HGL-3.2.0.0, HTTP-3001.1.3, HTTP-4000.0.4, HTTP-4000.0.5, InfixApplicative-1.0.1, QuickCheck-1.2.0.0, Stream-0.3.1, arrows-0.4.1, binary-0.5.0.1, cgi-3001.1.7.1, extensible-exceptions-0.1.1.0, filepath-1.1.0.2, ghc-paths-0.1.0.5, haddock-2.4.1, haskell98-1.0.1.0, irc-0.4.3, lazysmallcheck-0.3, network-2.2.0.1, network-2.2.1, old-time-1.0.0.2, parsec-2.1.0.1, process-1.0.1.1, random-1.0.0.1, sparsebit-0.5, terminfo-0.3.0.2, zlib-0.4.0.4, zlib-0.5.0.0 kyagrd@kyagrd:~$ cabal upgrade unix Resolving dependencies... Configuring unix-2.3.2.0... checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking dlfcn.h usability... yes checking dlfcn.h presence... yes checking for dlfcn.h... yes checking for an ANSI C-conforming const... yes checking for special C compiler options needed for large files... no checking for _FILE_OFFSET_BITS value needed for large files... 64 checking dirent.h usability... yes checking dirent.h presence... yes checking for dirent.h... yes checking fcntl.h usability... yes checking fcntl.h presence... yes checking for fcntl.h... yes checking grp.h usability... yes checking grp.h presence... yes checking for grp.h... yes checking limits.h usability... yes checking limits.h presence... yes checking for limits.h... yes checking pwd.h usability... yes checking pwd.h presence... yes checking for pwd.h... yes checking signal.h usability... yes checking signal.h presence... yes checking for signal.h... yes checking for string.h... (cached) yes checking sys/resource.h usability... yes checking sys/resource.h presence... yes checking for sys/resource.h... yes checking sys/times.h presence... yes checking for sys/times.h... yes checking sys/time.h usability... yes checking sys/time.h presence... yes checking for sys/time.h... yes checking sys/utsname.h usability... yes checking sys/utsname.h presence... yes checking for sys/utsname.h... yes checking sys/wait.h usability... yes checking sys/wait.h presence... yes checking for sys/wait.h... yes checking libutil.h usability... no checking libutil.h presence... no checking for libutil.h... no checking pty.h usability... yes checking pty.h presence... yes checking for pty.h... yes checking utmp.h usability... yes checking utmp.h presence... yes checking for utmp.h... yes checking termios.h usability... yes checking termios.h presence... yes checking for termios.h... yes checking time.h usability... yes checking time.h presence... yes checking for time.h... yes checking for unistd.h... (cached) yes checking utime.h usability... yes checking utime.h presence... yes checking for utime.h... yes checking for getgrgid_r... yes checking for getgrnam_r... yes checking for getpwnam_r... yes checking for getpwuid_r... yes checking for getpwnam... yes checking for getpwuid... yes checking for getpwent... yes checking for getgrent... yes checking for lchown... yes checking for setenv... yes checking for sysconf... yes checking for unsetenv... yes checking for nanosleep... yes checking for ptsname... yes checking for setitimer... yes checking for shm_open in -lrt... yes checking for shm_open... yes checking for shm_unlink... yes checking value of SIGABRT... 6 checking value of SIGALRM... 14 checking value of SIGBUS... 7 checking value of SIGCHLD... 17 checking value of SIGCONT... 18 checking value of SIGFPE... 8 checking value of SIGHUP... 1 checking value of SIGILL... 4 checking value of SIGINT... 2 checking value of SIGKILL... 9 checking value of SIGPIPE... 13 checking value of SIGQUIT... 3 checking value of SIGSEGV... 11 checking value of SIGSTOP... 19 checking value of SIGTERM... 15 checking value of SIGTSTP... 20 checking value of SIGTTIN... 21 checking value of SIGTTOU... 22 checking value of SIGUSR1... 10 checking value of SIGUSR2... 12 checking value of SIGPOLL... 29 checking value of SIGPROF... 27 checking value of SIGSYS... 31 checking value of SIGTRAP... 5 checking value of SIGURG... 23 checking value of SIGVTALRM... 26 checking value of SIGXCPU... 24 checking value of SIGXFSZ... 25 checking value of SIG_BLOCK... 0 checking value of SIG_SETMASK... 2 checking value of SIG_UNBLOCK... 1 checking for _SC_GETGR_R_SIZE_MAX... yes checking for _SC_GETPW_R_SIZE_MAX... yes checking return type of usleep... int checking return type of unsetenv... int checking for RTLD_NEXT from dlfcn.h... no checking for RTLD_DEFAULT from dlfcn.h... no checking for RTLD_LOCAL from dlfcn.h... yes checking for RTLD_GLOBAL from dlfcn.h... yes checking for RTLD_NOW from dlfcn.h... yes checking for openpty... no checking for openpty in -lutil... yes checking for /dev/ptmx... yes checking for /dev/ptc... no checking for dlopen in -ldl... yes checking build system type... i686-pc-linux-gnu checking host system type... i686-pc-linux-gnu checking target system type... i686-pc-linux-gnu configure: creating ./config.status config.status: creating unix.buildinfo config.status: creating include/HsUnixConfig.h Preprocessing library unix-2.3.2.0... Building unix-2.3.2.0... [ 1 of 21] Compiling System.Posix.User ( dist/build/System/Posix/User.hs, dist/build/System/Posix/User.o ) [ 2 of 21] Compiling System.Posix.Unistd ( dist/build/System/Posix/Unistd.hs, dist/build/System/Posix/Unistd.o ) [ 3 of 21] Compiling System.Posix.Time ( dist/build/System/Posix/Time.hs, dist/build/System/Posix/Time.o ) [ 4 of 21] Compiling System.Posix.Resource ( dist/build/System/Posix/Resource.hs, dist/build/System/Posix/Resource.o ) [ 5 of 21] Compiling System.Posix.Process.Internals ( System/Posix/Process/Internals.hs, dist/build/System/Posix/Process/Internals.o ) System/Posix/Process/Internals.hs:10:17: Module `GHC.Conc' does not export `Signal' cabal: Error: some packages failed to install: unix-2.3.2.0 failed during the building phase. The exception was: exit: ExitFailure 1

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Re: cabal: confusing dependencies conflict between ghc-6.10.1 and process
by Duncan Coutts 16 Apr '09

16 Apr '09

On Thu, 2009-04-16 at 10:52 +0200, Martijn van Steenbergen wrote: > Duncan Coutts wrote: > > For future reference this is now in the new Cabal FAQ: > > http://haskell.org/cabal/FAQ.html > > > > which is now linked from the cabal home page. > > Neat. That's gonna be helpful. > > "The default version of the parsec package is version 2.x." > > Is parsec special in this regard? Only slightly special: http://hackage.haskell.org/packages/archive/preferred-versions -- A global set of preferred versions. -- -- This is to indicate a current recommended version, to allow stable and -- experimental versions to co-exist on hackage and to help transitions -- between major API versions. -- -- Tools like cabal-install take these preferences into account when -- constructing install plans. -- base < 4 parsec < 3 HaXml == 1.13.* QuickCheck < 2 Duncan

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strict version of operations on IntMap and IntSet
by Manlio Perillo 14 Apr '09

14 Apr '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi. - From a discussion I had some time ago on haskell-cafe, it seems that all operations on IntMap and IntSet are lazy. The only exception is `alter`, for IntMap. This can be a problem. As an example, using `fromList` (both from IntMap and IntSet) seems to be rather unfriendly to the garbage collector. Is it possible to have strict variants of the most common operations? Thanks Manlio Perillo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAknkja0ACgkQscQJ24LbaUThzACffL9JTJv9LqmdZIEJeY9EFobT tZgAnitfwGvaHM+kpOEHX8/mNtnYGVsF =E7+2 -----END PGP SIGNATURE-----

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Broken beyond repair: Control.Concurrent.SampleVar
by ChrisK 13 Apr '09

13 Apr '09

Hello all, The SampleVar module in base is not exception safe. I believe that there is no way to fix this module to be exception safe while retaining the current behavior. The problem with the current behavior is that the writeSampleVar pretends to know how many blocked reader threads are waiting on a value. In reality these blocked threads may have been killed. When writeSampleVar sees blocked threads it does a blocking putMVar and then decrements the blocked reader thread count. If any two of the blocked reader threads ever die then eventually you get a blocked writer. I can find no efficient way to retain the current behavior in the presence of exceptions. The logic of the current behavior is that the blocked readers mean that the previously written value should not be discarded, the previous value belongs to the next blocked reader. I propose that SampleVar be either removed, or replaced with a slightly different exception safe version. I propose not considering the previously written value to belong to a blocked reader, and to replace it with the new value. I will open a ticket about this when I get more time. -- Chris

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ANN: MSem replacement for QSem
by ChrisK 11 Apr '09

11 Apr '09

"Grasshopper, try to take the stone from my hand" Hello all, After looking at the code for QSem [1], I realize it is not exception safe. And it does more work than needed. I have a proposed replacement module MSem at http://haskell.org/haskellwiki/SafeConcurrent on the wiki. I claim this is a safer, more correct, and more efficient replacement for QSem. But I may be tragically wrong which is where you come in. Please try and find some strange concurrency bug that I have missed. Once there is reviewed replacement code I will propose changing the base package. Exception safe replacements for QSemN and SampleVar are also needed. The MSem code I have can be generalized into an "MSemN", but the semantics are be different from "QSemN". This MSemN only considers the needs of the first blocked waiter instead of all of them. The code MSemN is on the same wiki page, perhaps someone will find this variant useful. Cheers, Chris [1] http://www.haskell.org/ghc/docs/latest/html/libraries/base/src/Control-Conc…

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