Could anyone point me to a sample implementation of a thread pool in C++, please? I'm looking for a very basic one without too much complexity, which would be suitable for a beginner in threading to study.
Look at Intel's Thread Building Blocks. I don't know how well that library meets your "simple" criteria, but it seems to be very well thought-out and thorough. I would think that it would be worth the effort to learn if you want to do threading in C++.
Boost also has some threading facilities.
It may be worth to check out Qt's QThreadPool implementation.
This is a very good one : threadpool its built uppon boost so its cross platform and everything , very easy to use as well
in his book Modern C++ Programming with Test-Driven Development, Jeff Langr walks thru a threadpool implementation. It's a busy wait implementation. I've modified it further here https://github.com/spakai/threadpool_future to support things such as signal-wait and futures.
来源：https://stackoverflow.com/questions/4179316/simple-thread-pool-in-c