Function wait_cond_thread

test/bthread_cond_unittest.cpp:463–469

}

void* wait_cond_thread(void* arg) {
    BthreadCond* c = (BthreadCond*)arg;
    started_wait = true;
    c->Wait();
    ended_wait = true;
    return NULL;
}

static void launch_many_bthreads() {
    g_stop = false;