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c++multithreadingstdthread

Thread pool for std::async

In the documentation of std::async it's mentioned that (emphasis mine):

The function template async runs the function f asynchronously (potentially in a separate thread which might be a part of a thread pool) and returns a std::future that will eventually hold the result of that function call.

Is it possible to specify a thread pool for calls to async? If not can I somehow check whether a thread pool was used or not?

Solution

  • The standard std::async lack of this level of control, although implementation may provide such as non-standard guarantees/extensions.

    The lack of this level of control is recognized -- there's https://wg21.link/p0443 proposal to address this.

    For now the best option is probably to own thread pool using std::thread and std::packaged_task.