Boost C++ Application Development Cookbook by Unknown

Author:Unknown
Language: eng
Format: epub, pdf
Publisher: Packt Publishing

Executing different tasks in parallel

Now it is time to make our tasks_queue process tasks in multiple threads. How hard could this be?

Getting ready

You will need to read the first recipe from this chapter. Some knowledge of multithreading is also required, especially reading the Manipulating a group of threads recipe in Chapter 5, Multithreading.

How to do it...

All we need to do is to add the start_multiple method to our tasks_queue class:

#include <boost/thread/thread.hpp> // Default value will attempt to guess optimal count of threads void start_multiple(std::size_t threads_count = 0) { if (!threads_count) { threads_count = (std::max)(static_cast<int>( boost::thread::hardware_concurrency()), 1 ); } // one thread is the current thread -- threads_count; boost::thread_group tg; for (std::size_t i = 0; i < threads_count; ++i) { tg.create_thread(boost::bind( &boost::asio::io_service::run, boost::ref(ios_) )); } ios_.run(); tg.join_all(); }

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