John Launchbury presented the Orc language for concurrent scripting at the Haskell Workshop, 2010 in Baltimore.
Concurrent Orchestration in HaskellJohn LaunchburyTrevor Elliott
The talk slides are available in PDF or online.
We present a concurrent scripting language embedded in Haskell, emulating the functionality of the Orc orchestration language by providing many-valued (real) non-determinism in the context of concurrent effects. We provide many examples of its use, as well as a brief description of how we use the embedded Orc DSL in practice. We describe the abstraction layers of the implementation, and use the fact that we have a layered approach to establish and demonstrate algebraic properties satisfied by the combinators.