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Instances for BaudRate from System.Posix.Terminal
by Heka Treep 02 May '11

02 May '11

Hi, the c-libraries use BaudRate as integers, so how about to add Enum instance for BaudRate? It allow users to use fromEnum, toEnum methods. Like this: module System.Posix.Terminal ( ... data BaudRate = B0 ... | B115200 deriving ( Eq, Ord ) instance Enum BaudRate where fromEnum b = case b of B0 -> 0 B50 -> 50 B75 -> 75 B110 -> 110 B134 -> 134 B150 -> 150 B200 -> 200 B300 -> 300 B600 -> 600 B1200 -> 1200 B1800 -> 1800 B2400 -> 2400 B4800 -> 4800 B9600 -> 9600 B19200 -> 19200 B38400 -> 38400 B57600 -> 57600 B115200 -> 115200 toEnum i = case i of 0 -> B0 50 -> B50 75 -> B75 110 -> B110 134 -> B134 150 -> B150 200 -> B200 300 -> B300 600 -> B600 1200 -> B1200 1800 -> B1800 2400 -> B2400 4800 -> B4800 9600 -> B9600 19200 -> B19200 38400 -> B38400 57600 -> B57600 115200 -> B115200 _ -> error $ "unsupported baudrate " ++ show i

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Arrows that are also Functors
by Henning Thielemann 01 May '11

01 May '11

Is it common to make a type an instance of both Arrow and Functor type class? If a type is both instance of Arrow and Functor, would you expect that fmap = (^<<) ? If yes, how about adding this as expected law to the Control.Arrow documentation? Same question for Applicative functors and liftA2 (,) = (&&&). (Btw. Control.Arrow haddock documentation does not mention any Arrow law so far.)

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ANNOUNCE: cereal-0.3.3.0
by Trevor Elliott 26 Apr '11

26 Apr '11

Hot on the heels of the last release, cereal-0.3.3.0 [1] adds support for parsing and rendering lazy ByteStrings. Most running functions in Data.Serialize.Get and Data.Serialize.Put now have lazy analogues, and Data.Serialize has gained encodeLazy and decodeLazy. This new functionality was made possible by the incremental parsing support added in cereal-0.3.1.0 by Lemmih. [1] http://hackage.haskell.org/package/cereal-0.3.3.0

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Subject: Hackage broken -- no building/haddock being done
by Darius Jahandarie 24 Apr '11

24 Apr '11

Hello all, Hackage seems to have stopped building packages since April 16th. Consequently, no haddocks have been created for all packages uploaded since then. Here is the last package that built: http://hackage.haskell.org/package/acid-state-0.3 Here is the package right after it, which was the first failure: http://hackage.haskell.org/package/text-json-qq-0.3.0 I got these packages by scrapping what 'hackagebot' said on #haskell and checking the urls, but since that bot drops in and out randomly, it's possible that I missed some packages. The full list of packages uploaded since text-json-qq-0.3.0 is attached (again, from hackagebot). Hopefully this is a fixable problem. :) Cheers. -- Darius Jahandarie

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ANNOUNCE: iteratee-compress 0.2.0.0
by Maciej Piechotka 23 Apr '11

23 Apr '11

Iteratee-compress provides compressing and decompressing enumerators including flushing (using John Lato's implementation). Currently only gzip and bzip is provided but LZMA is planned. Changes from previous version: - Add BZip support Next goals: - LZMA support - Generic interface for flushing To think about: - Should inner iteratee be able to request flushing Regards

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Re: Hackage broken -- no building/haddock being done
by Ross Paterson 23 Apr '11

23 Apr '11

On Fri, Apr 22, 2011 at 06:40:41PM -0400, Darius Jahandarie wrote: > Hackage seems to have stopped building packages since April 16th. > Consequently, no haddocks have been created for all packages uploaded > since then. I'm afraid I don't have access to the build machine until Tuesday 26th. Hopefully it will be back on the job then.

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Proposal: Add CUSeconds, CSUSeconds to Foreign.C.Types, and fix definition of CTimeval
by Ian Lynagh 22 Apr '11

22 Apr '11

Hi all, This is a proposal to add CUSeconds, CSUSeconds to Foreign.C.Types (which are Haskell versions of the C useconds_t and suseconds_t types), and fix the definition of CTimeval to use CTime and CSUSeconds rather than CLong. The C types are specified here: http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/time.h.html This will fix a bug in getCPUTime on OS X. Patches, from William Knop, to implement this are here: http://hackage.haskell.org/trac/ghc/attachment/ticket/4970/0001-Add-Haskell… http://hackage.haskell.org/trac/ghc/attachment/ticket/4970/0002-Whitespace-… http://hackage.haskell.org/trac/ghc/attachment/ticket/4970/0003-Use-CSUSeco… http://hackage.haskell.org/trac/ghc/attachment/ticket/4970/0001-Use-CSUSeco… Discussion deadline: 7 May 2011 Thanks Ian

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[PATCH 1/2] add calloc and callocBytes to Foreign.Marshal.Alloc
by Jason Dagit 22 Apr '11

22 Apr '11

--- Foreign/Marshal/Alloc.hs | 29 +++++++++++++++++++++++++++++ 1 files changed, 29 insertions(+), 0 deletions(-) diff --git a/Foreign/Marshal/Alloc.hs b/Foreign/Marshal/Alloc.hs index 612d2c7..148190b 100644 --- a/Foreign/Marshal/Alloc.hs +++ b/Foreign/Marshal/Alloc.hs @@ -53,6 +53,9 @@ module Foreign.Marshal.Alloc ( malloc, -- :: Storable a => IO (Ptr a) mallocBytes, -- :: Int -> IO (Ptr a) + calloc, -- :: Storable a => IO (Ptr a) + callocBytes, -- :: Int -> IO (Ptr a) + realloc, -- :: Storable b => Ptr a -> IO (Ptr b) reallocBytes, -- :: Ptr a -> Int -> IO (Ptr a) @@ -168,6 +171,32 @@ allocaBytesAligned :: Int -> Int -> (Ptr a -> IO b) -> IO b allocaBytesAligned size align = allocaBytes size -- wrong #endif +-- | Allocate a block of memory that is sufficient to hold values of type +-- @a@. The size of the area allocated is determined by the 'sizeOf' +-- method from the instance of 'Storable' for the appropriate type. +-- The memory is initalized to 0. +-- +-- The memory may be deallocated using 'free' or 'finalizerFree' when +-- no longer required. +-- +{-# INLINE calloc #-} +calloc :: Storable a => IO (Ptr a) +calloc = doCalloc undefined + where + doCalloc :: Storable b => b -> IO (Ptr b) + doCalloc dummy = callocBytes (sizeOf dummy) + +-- | Allocate a block of memory of the given number of bytes. +-- The block of memory is sufficiently aligned for any of the basic +-- foreign tyes that fit into a memory block of the allocated size. +-- The memory is initialized to 0. +-- +-- The memory may be deallocated using 'free' or 'finalizerFree' when +-- no longer required. +-- +callocBytes :: Int -> IO (Ptr a) +callocBytes size = failWhenNULL "calloc" (_calloc (fromIntegral size) 1) + -- |Resize a memory area that was allocated with 'malloc' or 'mallocBytes' -- to the size needed to store values of type @b@. The returned pointer -- may refer to an entirely different memory area, but will be suitably -- 1.7.4.1

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Stop using "Int" for microsecond delays in "base"
by Paul Johnson 21 Apr '11

21 Apr '11

The "base" library has the "threadDelay" primitive, which takes an Int argument in microseconds. Unfortunately this means that the longest delay you can get on a 32 bit machine with GHC is just under 36 minutes (2^31 uSec), and a hypothetical compiler that only used 30 bit integers (as per the standard) would get under 10 minutes. It is a bit tricky to write general-purpose libraries with this. I think that there should be a type Delay = Int64 declaration, and that threadDelay and related functions should take that as an argument type. Paul.

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ANNOUNCE: cereal-0.3.1.0
by Trevor Elliott 19 Apr '11

19 Apr '11

Hi Everyone, I'm proud to announce version 0.3.1.0 of the cereal binary-(de)serialization library [1]! This version includes some new functionality contributed by Lemmih, that adds support for partial parses in the Get monad. The changes don't modify the API presented in 0.3.0.0, instead adding a new runPartialGet function for the Get monad when partial parses are desired. [1] http://hackage.haskell.org/package/cereal-0.3.1.0

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