Function resize

pdal/util/ThreadPool.hpp:120–125

Change the number of threads. Current threads will be joined.

    // Change the number of threads.  Current threads will be joined.
    PDAL_EXPORT void resize(const std::size_t numThreads)
    {
        join();
        m_numThreads = numThreads;
        go();
    }

    // Add a threaded task, blocking until a thread is available.  If join() is
    // called, add() may not be called again until go() is called and completes.