[Haskell-cafe] Poisx select support
Hello, In the ghc libraries directory I can't find the Haskell .hs/.lhsthat implements Posix select. ?? I found Select.c. Regards, Vasili ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
vigalchin: Hello, In the ghc libraries directory I can't find the Haskell .hs/.lhsthat implements Posix select. ?? I found Select.c. In Control.Concurrent forkIO threadDelay threadWaitRead threadWaitWrite The thread primitives are implemented in terms of select, and give you a cleaner interface. Also, with Control.Concurrent.STM. atomically orElse retry You can have threads wait on one of a series of alternative events. Using STM, you'll be able to compose blocks of such code, which you can't do with select. -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
Hi Don, Sorry ..I wasn't clear enough.I am trying to determine from the Haskell FFI doc what datatype to use in order to model C's void *, e.g. for mmap http://www.opengroup.org/onlinepubs/95399/functions/mmap.html Regards, Vasili On 1/16/08, Don Stewart [EMAIL PROTECTED] wrote: vigalchin: Hello, In the ghc libraries directory I can't find the Haskell .hs/.lhsthat implements Posix select. ?? I found Select.c. In Control.Concurrent forkIO threadDelay threadWaitRead threadWaitWrite The thread primitives are implemented in terms of select, and give you a cleaner interface. Also, with Control.Concurrent.STM. atomically orElse retry You can have threads wait on one of a series of alternative events. Using STM, you'll be able to compose blocks of such code, which you can't do with select. -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
vigalchin: Hi Don, Sorry ..I wasn't clear enough.I am trying to determine from the Haskell FFI doc what datatype to use in order to model C's void *, e.g. for mmap [1]http://www.opengroup.org/onlinepubs/95399/functions/mmap.html Regards, Vasili In the System.IO.Posix.MMap module, mmap is imported as: foreign import ccall unsafe hs_bytestring_mmap.h hs_bytestring_mmap c_mmap :: CSize - CInt - IO (Ptr Word8) foreign import ccall unsafe hs_bytestring_mmap.h munmap c_munmap :: Ptr Word8 - CSize - IO CInt You can see the full binding to mmap here: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bytestring-mmap Cheers, Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
Hi Don, I am looking at the code for ghc-6.8.2 but don't see the mmap support. Is this newly wriiten by you? I would also like to help round out the Posix functionality in Haskell. Is there an accurate list of what needs to be done given the fact that maybe some work is in progress but not checked in? Thank you, Vasili On 1/16/08, Don Stewart [EMAIL PROTECTED] wrote: vigalchin: Hi Don, Sorry ..I wasn't clear enough.I am trying to determine from the Haskell FFI doc what datatype to use in order to model C's void *, e.g. for mmap [1]http://www.opengroup.org/onlinepubs/95399/functions/mmap.html Regards, Vasili In the System.IO.Posix.MMap module, mmap is imported as: foreign import ccall unsafe hs_bytestring_mmap.h hs_bytestring_mmap c_mmap :: CSize - CInt - IO (Ptr Word8) foreign import ccall unsafe hs_bytestring_mmap.h munmap c_munmap :: Ptr Word8 - CSize - IO CInt You can see the full binding to mmap here: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/bytestring-mmap Cheers, Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
vigalchin: Hi Don, I am looking at the code for ghc-6.8.2 but don't see the mmap support. Is this newly wriiten by you? I would also like to help round out the Posix functionality in Haskell. Is there an accurate list of what needs to be done given the fact that maybe some work is in progress but not checked in? Thank you, Vasili Code isn't generally checked into ghc 6.8.2, or the base libraries. Instead, new projects are distributed via hackage.haskell.org. It is like CPAN for Haskell, if you're familiar with CPAN. The mmap bytestring package is available there, for example. For improving POSIX support in general, careful patches to the 'unix' library would be the best way: http://hackage.haskell.org/cgi-bin/hackage-scripts/package/unix If something you need is missing from there, write it as a patch against the darcs repository for `unix', http://darcs.haskell.org/packages/unix/, and submit it to [EMAIL PROTECTED] for inclusion in the next release of that library. -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
On Wed, Jan 16, 2008 at 12:40:22PM -0800, Donald Bruce Stewart wrote: If something you need is missing from there, write it as a patch against the darcs repository for `unix', http://darcs.haskell.org/packages/unix/, and submit it to [EMAIL PROTECTED] for inclusion in the next release of that library. Please note that patches for the unix library should follow the library submissions process: http://www.haskell.org/haskellwiki/Library_submissions Thanks Ian ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
On Wed, Jan 16, 2008 at 02:09:31PM -0600, Galchin Vasili wrote: Hi Don, Sorry ..I wasn't clear enough.I am trying to determine from the Haskell FFI doc what datatype to use in order to model C's void *, e.g. for mmap http://www.opengroup.org/onlinepubs/95399/functions/mmap.html Regards, Vasili For C's void *, I'd use Ptr (). Cheers, Spencer Janssen ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Poisx select support
Spencer Janssen wrote: For C's void *, I'd use Ptr (). Ptr a seems to be more usual, and hews closer to the idea that it's a pointer to an opaque value. b ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
