keepalive problem with libpg connection

Hi,

I am writing my own connection pool for libpq's connection. 

My goal is to try to reduce the amount of time spent in opening and closing socket.   However, I see that Postgres would close my connection after every so often.

What is the best solution for that? Should I regularly send some "Select 1" to keep the connection alive or is there a better way to write a connection pool for libpq?


Any suggestion will be greatly appreciated.

JB