Function odd_thread

test/bthread_setconcurrency_unittest.cpp:67–78

static butil::atomic<bool> stop (false);

static void *odd_thread(void *) {
    nbthreads.fetch_add(1);
    while (!stop) {
        if (!counted) {
            counted = true;
            npthreads.fetch_add(1);
        }
        bthread::butex_wake_all(even);
        bthread::butex_wait(odd, 0, NULL);
    }
    return NULL;
}

static void *even_thread(void *) {
    nbthreads.fetch_add(1);