Thoughts on nginx 2-event handling

Nginx event processing function ngx_process_events_and_timers. in Linux, ngx_epoll_process_events will be called.

Then epoll_wait gets the corresponding event and then processes it accordingly, that is, listening and processing are handled in the same thread, which has several problems:

1. If there are multiple events, you must wait until the processing of the previous event is completed before processing the next event.

2. The same connection can only be performed in the order of "receive-send-receive-Send", but cannot implement real duplex.

In addition, the ngx_epoll_add_event/ngx_epoll_add_connection function has limited a process to receive only one processing thread, but only multi-process.

The above is a major bottleneck for processing streaming media protocols.