In `test_udpSock`, if `try_flush` is not enforced when sending, the message will not be sent.

[dongdan002]

In the test code test_udpSock.cpp, sendSock sets try_flush to false when sending, and the message cannot be sent out.

// Send data to the other party every second // sockSend->send(to_string(i++), (struct sockaddr )&addrDst); // Modify to non-forced flush try_flush = false; sockSend->send(to_string(i++), (struct sockaddr )&addrDst, 0, try_flush);

The reason is: When the send buffer is empty, the poller thread will modify the listening fd, turn off writing, stopWriteAbleEvent(). However, startWriteAbleEvent() is only triggered in non-poller threads, and there are no other operations to modify the fd event. This leads to no write event for the fd in the select. if (!poller_thread) { @mtdxc // If this function is triggered by the poller thread, then this socket should have been added to the listening of writable events , so we don't need to add it again startWriteAbleEvent(sock); }

在 test_udpSock.cpp 测试代码中，sendSock在发送的时候设置try_flush为false，消息发送不出去。

//每隔一秒往对方发送数据 // sockSend->send(to_string(i++), (struct sockaddr )&addrDst); //修改为非强制刷新 try_flush = false; sockSend->send(to_string(i++), (struct sockaddr )&addrDst, 0, try_flush);

原因为： 当发送缓冲区为空的时候，poller线程会修改监听fd，关掉写,stopWriteAbleEvent（） 但是startWriteAbleEvent（）只会在非poller线程中触发，又没有其他操作来修改fd的event。导致在select时候，fd没有write事件 if (!poller_thread) { @mtdxc // 如果该函数是poller线程触发的，那么该socket应该已经加入了可写事件的监听<实际并没有加进去>，所以我们不需要再次加入监听 startWriteAbleEvent(sock); }

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[xia-chu]

sendSock在发送的时候设置try_flush为false，消息发送不出去。

This is expected behavior. It is designed this way. Users need to call the flushAll interface again.

sendSock在发送的时候设置try_flush为false，消息发送不出去。

这是预期行为 就是这么设计的 用户需要再调一次flushAll接口才行

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[xia-chu]

The initial design was intended for batch sending to improve performance.

这样设计的初衷是批量发送提高性能

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[dongdan002]

Okay, I understand. Thanks for the explanation.

好的，了解了，多谢解答

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