How do I create a thread pool using Boost in C ?

Creating a Thread Pool with Boost in C

In C , creating a thread pool using the Boost library requires a straightforward process.

Firstly, instantiate an asio::io_service and a thread_group. Subsequently, populate the thread_group with threads connected to the io_service. Tasks can then be assigned to the threads utilizing the boost::bind function.

To halt the threads, simply discontinue the io_service and combine all of them.

The necessary header files are:

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

An example implementation is provided below:

// 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();

(Source: Recipes < Asio)

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