Name:                atomic-primops
Version:             0.8.1.1
License:             BSD3
License-file:        LICENSE
Author:              Ryan Newton
Maintainer:          rrnewton@gmail.com
Category:            Data
-- Portability:         non-portabile (x86_64)
Build-type:          Simple
Cabal-version:       >=1.18
HomePage: https://github.com/rrnewton/haskell-lockfree/wiki
Bug-Reports: https://github.com/rrnewton/haskell-lockfree/issues

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.
 .
  Note that as of GHC 7.8, the relevant primops have been included in GHC itself.
  This library is engineered to work pre- and post-GHC-7.8, while exposing the
  same interface.

Extra-Source-Files:  CHANGELOG.md, DEVLOG.md,
                     testing/Test.hs, testing/test-atomic-primops.cabal, testing/ghci-test.hs
                     testing/Makefile, testing/CommonTesting.hs, testing/Counter.hs, testing/CounterCommon.hs, testing/hello.hs, testing/Fetch.hs
                     testing/Issue28.hs
                     testing/TemplateHaskellSplices.hs
                     testing/Raw781_test.hs

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

Library
  Default-Language: Haskell2010
  exposed-modules:   Data.Atomics
                     Data.Atomics.Internal
                     Data.Atomics.Counter
  ghc-options: -O2 -funbox-strict-fields
  ghc-options: -Wall

  -- 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 && < 4.11, ghc-prim, primitive

  -- TODO: Try to push support back to 7.0, but make it default to an implementation
  -- other than Unboxed.

  -- 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 for GHC 7.6:
     C-Sources:        cbits/RtsDup.c
  } else {
     if os(windows) {
        Include-Dirs:     cbits
        C-Sources:        cbits/RtsDup.c
     }
  }
  CC-Options:       -Wall

  -- 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:     https://github.com/rrnewton/haskell-lockfree/
    Subdir:       atomic-primops