Re: Manipulating C code at the AST level, in C

On Fri, 14 Aug 2026 23:47:19 -0400, c186282 wrote:

>    Polling, for this sort of thing, has to be
>    fast and constant - a big CPU drag. You are
>    basically WAITING for something to happen -
>    which MAY or may NOT happen at any moment.

I used select() rather than poll() but I'm archaic. Typically the select 
call was in the main loop. The timeout was often 1 second. If the call 
returned a ready fd you took care of business. If it timed out, then you 
did whatever housekeeping was necessary, making sure it wasn't a long 
process.

Without the select the main loop would chew up 100% of the CPU. Interrupt 
have their place but often complex ISRs are used that aren't any faster 
than polling.