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

c++ multithreading boost boost-thread
user179476 picture user179476 · Jul 27, 2010 · Viewed 7k times · Source

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_thread(aFunctionToExecute);
group.join_all();

This code will execute all threads at once. What I want to do is to execute them all but 4 maximum in parallel. When on is terminated, another one is executed until there are no more to execute.

Answer

James picture James · Jul 27, 2010

Another, more efficient solution would be to have each thread callback to the primary thread when they are finished, and the handler on the primary thread could launch a new thread each time. This prevents the repetitive calls to timed_join, as the primary thread won't do anything until the callback is triggered.

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