Function join

pdal/util/ThreadPool.hpp:75–86

Disallow the addition of new tasks and wait for all currently running tasks to complete.

    // Disallow the addition of new tasks and wait for all currently running
    // tasks to complete.
    PDAL_EXPORT void join()
    {
        std::unique_lock<std::mutex> lock(m_mutex);
        if (!m_running) return;
        m_running = false;
        lock.unlock();

        m_consumeCv.notify_all();
        for (auto& t : m_threads)
            t.join();
        m_threads.clear();
    }

    // join() and empty the queue of tasks that may have been waiting to run.
    PDAL_EXPORT void stop()