C で Boost を使用してスレッド プールを作成するにはどうすればよいですか?

#include <boost/asio/io_service.hpp>
#include <boost/bind.hpp>
#include <boost/thread/thread.hpp>

// Establish an io_service and a thread_group (essentially a pool)
boost::asio::io_service ioService;
boost::thread_group threadpool;

// Commence ioService processing loop
boost::asio::io_service::work work(ioService);

// Add threads to pool (e.g., two in this case)
threadpool.create_thread(
    boost::bind(&boost::asio::io_service::run, &ioService)
);
threadpool.create_thread(
    boost::bind(&boost::asio::io_service::run, &ioService)
);

// Assign tasks to thread pool via ioService.post()
// Refer to "http://www.boost.org/doc/libs/1_54_0/libs/bind/bind.html#with_functions" for details on boost::bind
ioService.post(boost::bind(myTask, "Hello World!"));
ioService.post(boost::bind(clearCache, "./cache"));
ioService.post(boost::bind(getSocialUpdates, "twitter,gmail,facebook,tumblr,reddit"));

// Halt ioService processing loop (no new tasks will execute after this point)
ioService.stop();

// Wait and combine threads in thread pool
threadpool.join_all();