如何使升压:: thread_group执行并行线程的固定数量 [英] How to make boost::thread_group execute a fixed number of parallel threads

问题描述

这是code创建一个thread_group和并行执行的所有线程：

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();

这code将同时执行所有线程。我想要做的就是执行他们所有，但4最大并行。当在终止时，另一个被执行，直到没有更多的要执行

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.

推荐答案

另外，更高效的解决方案是让每个线程回调主线程，当他们完成，主线程的处理函数可以启动一个新的线程每一次。这prevents到timed_join重复呼叫，直到回调触发主线程不会做任何事情。

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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