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.
Changes
0.8.4 [2020.10.03]
Allow building with base-4.15 (GHC 9.0).
0.8.3 [2019.05.02]
Allow the tests to build with base-4.13 (GHC 8.8).
Require GHC 7.10 or later.
0.8.2 [2018.03.08]
Allow building with base-4.11.
0.8.1.1 [2017.12.10]
Bundle testing/Fetch.hs with the package tarball
0.8.1
Simplify Setup.hs to support Cabal-2.0/GHC 8.2
Properly link store_load_barrier and friends against the GHC RTS on Windows
when using GHC 8.2 or later
0.8.0.4
Internal changes to support forthcoming GHC 8.0
0.8
Implements additional fetch primops available in GHC 7.10
0.7
This release adds support for GHC 7.10 and its expanded library of (now inline) primops.
0.6.1
This is a good version to use for GHC 7.8.3. It includes portability and bug fixes
and adds atomicModifyIORefCAS.
0.6.0.5
fix for GHC 7.8
0.6.0.1
minor ghc 7.8 fix
0.6
add atomicModifyIORefCAS, and bump due to prev bugfixes
0.5.0.2
IMPORTANT BUGFIXES - don’t use earlier versions. They have been marked deprecated.
0.5
Nix Data.Atomics.Counter.Foreign and the bits-atomic dependency.
0.4.1
Add advance support for GHC 7.8
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.
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’.
