Critique my simple thread pool

Learning parallel programing and pthreads so I tried my hand at writing a thread pool.

http://pastebin.com/ebrVWFa8

>>1
That's nice and all, but you're reinventing the wheel.

Just use libdispatch.

If you're on OSX or FreeBSD you're already set. With a Debian based OS, including Ubuntu and Linux Mint, just: $ sudo apt-get install libdispatch-dev.

Fedora is also getting it in the next major release.