There have been many new APIs proposed to improve the scalability , such as / dev / poll , real-time signals , I / O completion ports , / dev / epoll , and kernel queues .
为了提高可伸缩性，已经提出了许多新的API，比如/dev/poll、实时信号、I/O完成端口、/dev/epoll和内核队列。
epoll