Hello, I'd like to know if tcp connections are shared among light threads when you use `setkeepalive`.
If not, are there any ways to do this ?
I found the document says connection pool is per Nginx worker process, but was not sure about light thread.
Currently, our server do the following:
- creates a few light threads per request by using `ngx.timer.at`.
- on a light thread, open a tcp socket (by lua-resty-redis) and call `setkeepalive`.
