Function add_concurrency_proc

test/bthread_setconcurrency_unittest.cpp:133–138

}

void* add_concurrency_proc(void*) {
    bthread_t tid;
    bthread_start_background(&tid, &BTHREAD_ATTR_SMALL, sleep_proc, NULL);
    bthread_join(tid, NULL);
    return NULL;
}

bool set_min_concurrency(int num) {
    std::stringstream ss;