How to make boost::thread_group execute a fixed number of parallel threads

Question

This is the code to create a thread_group and execute all threads in parallel:

boost::thread_group group;
for (int i = 0; i < 15; ++i)
    group.create_th         


        

Answer 1

I think you are looking for a thread_pool implementation, which is available here.

Additionally I have noticed that if you create a vector of std::future and store futures of many std::async_tasks in it and you do not have any blocking code in the function passed to the thread, VS2013 (atleast from what I can confirm) will launch exactly the appropriate no of threads your machine can handle. It reuses the threads once created.