button-chen opened a new issue, #456:
URL: https://github.com/apache/rocketmq-client-cpp/issues/456
问题：
多线程并发调用 producer->send() 很容易得到错误消息：GetTransport of:xxx get timed_mutex
timeout 除了libevent的版本问题，还有一个原因是gcc版本的bug
原因：
if (!lock.try_lock_for(std::chrono::seconds(m_tcpTransportTryLockTimeout))) {
LOG_ERROR("GetTransport of:%s get timed_mutex timeout", addr.c_str());
std::shared_ptr<TcpTransport> pTcp;
return pTcp;
}
gcc4.8.5的情况下，try_lock_for会立即返回，并不会等待期待的m_tcpTransportTryLockTimeout时长。
升级到4.9.0之后即可解决。
**std::timed_mutex::try_lock_for bug：
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54562**
@ShannonDing 建议在首页说明使用gcc版本应该高于等于4.9.0
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