clayborg added a comment. std::async is fine as long as it doesn't blow out the threads on any supported systems. We should also test doing multiple std::async calls in different places in some test only code to make sure if we run 4 std::async calls at once on different threads that we don't end up launching 4 times as many threads. So as long as std::async is limiting the number of threads globally within a process, we are good to go, else we should be sure to implement the limit using a thread pool. I sent you some code on the side that might take care of that if std::async isn't good enough. Else lets stick to the C++11 library when/where it is sufficient.
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