ustcr7 commented on issue #211: GetTransport of:x.x.x.x:yyyy get timed_mutex timeout URL: https://github.com/apache/rocketmq-client-cpp/issues/211#issuecomment-573565121 > 这里的问题比较奇怪，在 CloseTransport 过程会对 TcpRemotingClient::m_tcpTableLock 加锁，然后调用 TcpTransport::disconnect -> TcpTransport::freeBufferEvent 通过操作 bufferevent 进入 libevent，最终是锁在了 libevent 里面。所以才有一系列的 timed_mutex timeout。要解决这个问题，需要先定位为什么会锁在 libevent 里。 其实就是libevent在高并发情况下，关闭连接时的bug。下面几个链接有说明。 https://archives.seul.org/libevent/users/Aug-2012/msg00010.html https://github.com/libevent/libevent/issues/225 https://archives.seul.org/libevent/users/Apr-2013/msg00002.html 我根据代码和链接里面的解释大概画了个图： 
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