Waiting loop alternative in c++ thread pool

Question

I have implemented a simple thread pool in my program where the main thread sets the data and notify the threads to execute and then wait in a loop for them to finish.

while(true){

// set the data
....
// notify threads
...
while(n_done < num_threads){}        // wait in the while loop for threads to finish

}

Each thread takes approx 10-15 ms to complete until then the main thread just keeps looping for threads to finish consuming a lot of cpu usage. Is there any alternative method to stop or sleep the main thread execution until the threads complete without a loop.

Answer 1

如果您想等待所有线程完成而不重用它们，您可以在最后对每个线程使用join() 。