Function waiter

test/bthread_cond_unittest.cpp:52–64

}

void* waiter(void* void_arg) {
    Arg* a = (Arg*)void_arg;
    bthread_mutex_lock(&a->m);
    while (!stop) {
        bthread_cond_wait(&a->c, &a->m);
        
        BAIDU_SCOPED_LOCK(wake_mutex);
        wake_tid.push_back(bthread_self());
        wake_time.push_back(butil::gettimeofday_us());
    }
    bthread_mutex_unlock(&a->m);
    return NULL;
}

TEST(CondTest, sanity) {
    Arg a;