You're thinking of C++'s "executor", which is currently being discussed for addition to the standard. The parallel STL will use the executors once they're added to a technical specification. There's agreement on how integration this will work, and that it's the right thing to do, but executors don't have a fully agreed-upon API yet.
We (the C++ standards committee) discussed these things further this week :-)
We (the C++ standards committee) discussed these things further this week :-)