有条件的c ++ 11线程

Question

I'm trying to understand threading in c++11. Suppose I have an array arr={5,5,5,5,5}, and I want to calculate the value of {5^a^b, 5^a^b, 5^a^b, 5^a^b, 5^a^b} using two threads, with parameter a or b passed to the threads. How do I guarantee that the seconds thread acts on each term only after the first thread has worked on it (the difference between 5^a^b and 5^b^a)?

Thanks.

Answer 1

You may share an atomic variable between threads, that would represent the most-left index in array - of element that is not yet processed by first thread.

Increment index in the first thread after operation with a and loop in the second thread until index is less than size of an array.