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

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 ByteArrays on the GHC heap.

Changes in 0.5:

• Remove dependency on bits-atomic unless a flag is turned on.

Modules

[Index]

Flags

Automatic Flags

Name	Description	Default
debug	Enable extra internal checks.	Disabled
foreign	Enable a dependency on bits-atomic and in turn provide a foreign implementation of Counter.	Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• atomic-primops-0.5.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

• BrandonSimmons, GregoryCollins, RyanNewton, ryanglscott, peter_fogg, chchen

For package maintainers and hackage trustees

• edit package information

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