Ask HN: What is the best way to handle concurrency/parallelism in C?

Howdy all!

Generally I do Haskell and Erlang for a living, and consequently the tools for handling concurrency and threading and the like are built-in and easy.

However, I recently have been assigned a rather large project to be done in C, utilizing threads.

Since I'm relatively sure that me attempting to do threads manually will end with a lot of bugs, and since this project is requiring some socket-ey stuff anyway, I'm leaning towards ZeroMQ, but I would like to hear the arguments for OpenMP or any other threading libraries.