Function even_thread

test/bthread_setconcurrency_unittest.cpp:80–91

}

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

TEST(BthreadTest, setconcurrency_with_running_bthread) {
    odd = bthread::butex_create_checked<butil::atomic<int> >();