Programming with LVars, by example
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concurrent-skiplist @ aee1507
lvars @ a2cd234

Programming with LVars, by example

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LVars are monotonically growing, lattice-based data structures for deterministic parallel programming. LVish is a Haskell library for programming with LVars. This repository contains toy examples of programs that use LVars and LVish, as well as a few that don't use LVars but are there for illustrative purposes.


The code has been tested to build against GHC 7.8.1, 7.8.2, and 7.8.3. You should probably use one of those.

Installing LVish

LVish 1.1.4

You can install LVish from Hackage by running cabal install lvish (perhaps preceded by cabal update). That will install the most recently released version, which, as of this writing, is lvish-1.1.4.

LVish 2.0

If you want the newest, unreleased version of LVish -- which has more cool features than the 1.x releases do -- you'll have to install it from git. I recommend the following:

  • Make sure you've pulled the lvars and concurrent-skiplist submodules. Something like git submodule update --init should work. (lvars contains the LVish library and some of its friends; concurrent-skiplist is one of LVish's dependencies.)
  • Go into the 2.0 subdirectory.
  • Create a new sandbox in that directory with cabal sandbox init.
  • Run cabal install -j ../lvars/haskell/par-classes/ ../lvars/haskell/par-collections/ ../lvars/haskell/par-transformers/ ../concurrent-skiplist/ happy alex.
  • Run cabal install ../lvars/haskell/lvish/ and cross your fingers.

Then what?

Depending on whether you have lvish-1.1.4 or some flavor of lvish-2.0 installed, go here or here. Enjoy!


The usual caveats about research code apply: Parts of it are broken. The API will change. It will eat your laundry.