kqueue 引发OS X系统重启

[ken_scott]

使用到kqueue的代码

bool append_connection_to_reactor(Connection * connection)
{
    struct kevent event[2];
    struct timespec wait_timeout = { 0, 0 };
    EV_SET(&event[0], connection->get_socket(), EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, connection);
    EV_SET(&event[1], connection->get_socket(), EVFILT_WRITE, EV_ADD | EV_DISABLE, 0, 0, connection);
    if (-1 == kevent(m_reactor, event, sizeof(event) / sizeof(event[0]), nullptr, 0, &wait_timeout))
    {
        return(false);
    }
    return(true);
}

bool delete_connection_from_reactor(Connection * connection)
{
    struct kevent event[2];
    struct timespec wait_timeout = { 0, 0 };
    EV_SET(&event[0], connection->get_socket(), EVFILT_READ, EV_DELETE, 0, 0, connection);
    EV_SET(&event[1], connection->get_socket(), EVFILT_WRITE, EV_DELETE, 0, 0, connection);
    if (-1 == kevent(m_reactor, event, sizeof(event) / sizeof(event[0]), nullptr, 0, &wait_timeout))
    {
          return(false);
    }
    return(true);
}

bool modify_connection_of_reactor(Connection * connection, bool need_send, bool need_recv)
{
    struct kevent event[2];
    struct timespec wait_timeout = { 0, 0 };
    EV_SET(&event[0], connection->get_socket(), EVFILT_READ, (need_recv ? EV_ENABLE : EV_DISABLE), 0, 0, connection);
    EV_SET(&event[1], connection->get_socket(), EVFILT_WRITE, (need_send ? EV_ENABLE : EV_DISABLE), 0, 0, connection);
    if (-1 == kevent(m_reactor, event, sizeof(event) / sizeof(event[0]), nullptr, 0, &wait_timeout))
    {
        return(false);
    }
    return(true);
}

void reactor_connection_process(int fkqueue, Connection * listener)
{
    const size_t max_event_count = 256;
    struct kevent connection_events[max_event_count];
    struct timespec wait_timeout = { 1, 0 }; // seconds

    while (running())
    {
        int event_count = kevent(fkqueue, nullptr, 0, connection_events, max_event_count, &wait_timeout);
        if (-1 == event_count)
        {
            if (-1 == fkqueue)
            {
                break;
            }

            if (is_net_blocking_error())
            {
                continue;
            }
            else
            {
                printf("kevent failed: %d\n", net_error());
                break;
            }
        }
        else if (0 == event_count)
        {
            continue;
        }

        for (int index = 0; index < event_count; ++index)
        {
            struct kevent & connection_event = connection_events[index];
            Connection * connection = reinterpret_cast<Connection *>(connection_event.udata);
            if (listener == connection))
            {
                /* notify to accept */
                Connection * new_connection = do_accept(listener);
                append_connection_to_reactor(new_connection);
            }
            else
            {
                    if (EVFILT_READ == connection_event.filter)
                    {
                        /* notify to recv */
                        do_recv(connection);
                    }
                    else if (EVFILT_WRITE == connection_event.filter)
                    {
                        /* notify to send */
                        do_send(connection);
                        if (send_buffer_is_empty()) /* nothing need to send */
                        {
                              bool need_send = false;
                              bool need_recv = true;
                              modify_connection_of_reactor(Connection * connection, need_send, need_recv);
                        }
                    }
                }
            }
        }
    }
}

我写了个滚雪球一样的测试程序（单个数据越来越大），当最大数据为30 * 20 bytes时，正常。
当最大数据设定到100 * 20 bytes时，机器就会立即自动异常重启（不论作为请求方还是响应方），看启动报告，是内核崩溃了

用了两台OS X 10.11测试，都是一样的，一设定到100 * 20 bytes 的数据量，就直接重启了
不知道，有没有谁碰到过类似的情况。。。

确定代码其他地方没问题，因为代码原本是用epoll来实现的，改成OS X版本，只是将epoll相关函数改成kevent相关函数
也就是上述代码是不同的，其他代码应该是没问题的

关于kqueue的用法，不是特别了解，按我现有的理解和epoll应该差不多，但是遇到这个问题，我又不敢肯定了
欢迎指出kqueue的用法不当的地方。

[赵4老师]

OS X下有gdb吗？

[赵4老师]

这分来的容易啊！