Name:                atomic-primops
Version:             0.5
x-revision: 1
License:             BSD3
License-file:        LICENSE
Author:              Ryan Newton
Maintainer:          rrnewton@gmail.com
Category:            Data
-- Portability:         non-portabile (x86_64)
Build-type:          Custom
-- TODO: This requirement needs to be bumped to 1.17 when the latest cabal is
-- released.  This package triggers issue #1284:
Cabal-version:       >=1.8
HomePage: https://github.com/rrnewton/haskell-lockfree-queue/wiki

-- Version History:
-- 0.1.0.0 -- initial release
-- 0.1.0.2 -- disable profiling
-- 0.2 -- Critical bugfix and add Counter.
-- 0.2.2 -- Add more counters
-- 0.2.2.1 -- Minor, add warning.
-- 0.3 -- Major internal change.  Duplicate GHC RTS barriers and support non -threaded.
-- 0.4 -- Duplicate 'cas' as well as barriers.  Add fetchAdd on ByteArray, Counter.Unboxed.
-- 0.4.1 -- Add advance support for GHC 7.8
-- 0.5 -- Nix Data.Atomics.Counter.Foreign and the bits-atomic dependency.

Synopsis: A safe approach to CAS and other atomic ops in Haskell.

Description:

  After GHC 7.4 a new `casMutVar#` primop became available, but it's
  difficult to use safely, because pointer equality is a highly
  unstable property in Haskell.  This library provides a safer method
  based on the concept of "Tickets".
 .
  Also, this library uses the "foreign primop" capability of GHC to
  add access to other variants that may be of
  interest, specifically, compare and swap inside an array.
 .
 Changes in 0.3:
 .
 * Major internal change.  Duplicate the barrier code from the GHC RTS and thus 
   enable support for executables that are NOT built with '-threaded'.
 .
 Changes in 0.4:
 . 
 * Further internal changes, duplicate 'cas' routine well as barriers.  
 .
 * Add `fetchAddByteArrayInt`
 .
 * Add an `Unboxed` counter variant that uses movable "ByteArray"s on the GHC heap.
 .
 Changes in 0.5:
 . 
 * Remove dependency on bits-atomic unless a flag is turned on.


Extra-Source-Files:  DEVLOG.md,
                     testing/Test.hs, testing/test-atomic-primops.cabal,
                     testing/Makefile, testing/CommonTesting.hs, testing/CounterTests.hs, testing/hello.hs
--                    Makefile, Test.hs, README.md

Flag debug
    Description: Enable extra internal checks.
    Default: False

-- The bits-atomic based modules are causing problems [2014.01.23] 
Flag foreign
    Description: Enable a dependency on bits-atomic and in turn provide a 
                 foreign implementation of Counter.
    Default: False

Library
  exposed-modules:   Data.Atomics
                     Data.Atomics.Internal
                     Data.Atomics.Counter
                     Data.Atomics.Counter.IORef
                     Data.Atomics.Counter.Reference
                     Data.Atomics.Counter.Unboxed
  ghc-options: -O2 -funbox-strict-fields

  if flag (foreign) { 
    exposed-modules: Data.Atomics.Counter.Foreign
    build-depends: bits-atomic
  }

  -- casMutVar# had a bug in GHC 7.2, thus we require GHC 7.4 or greater
  -- (base 4.5 or greater). We also need the "Any" kind.
  build-depends:     base >= 4.6.0.0 && <= 4.7.0.0, ghc-prim, primitive, Cabal

  -- TODO: Try to push support back to 7.0:
  -- Ah, but if we don't USE casMutVar# in this package we are ok:
  -- build-depends:     base >= 4.3, ghc-prim, primitive

  if impl(ghc < 7.7) {
     Include-Dirs:     cbits
     C-Sources:        cbits/primops.cmm
     -- Duplicate RTS functionality: 
     C-Sources:        cbits/RtsDup.c
  }
  CC-Options:       -Wall 
  -- Let the code know that profiling is on:
  ghc-prof-options: -DGHC_PROFILING_ON

  -- if( cabal-version < 1.17 ) {
  --   ghc-prof-options: ERROR_DO_NOT_BUILD_THIS_WITH_PROFILING_YET__SEE_CABAL_ISSUE_1284
  -- }

  if flag(debug)
    cpp-options: -DDEBUG_ATOMICS


-- -- [2013.04.08] This isn't working presently:
-- -- I'm having problems with building it along with the library; see DEVLOG.
-- -- Switching to a separate package in ./testing/ 
-- Test-Suite test-atomic-primops
--     type:       exitcode-stdio-1.0


Source-Repository head
    Type:         git
    Location:     git://github.com/rrnewton/haskell-lockfree-queue.git