Re: Non-blocking communication between a frontend and a backend (pqcomm)

Fujii Masao wrote:
> http://archives.postgresql.org/pgsql-hackers/2009-07/msg00191.php
> 
> In line with Robert's suggestion, I submit non-blocking pqcomm patch
> as a self-contained one.
> 

Here's my initial review of the non-blocking pqcomm patch. The patch applies
cleanly and passes regression. Generally looks nice and clean. Couple of remarks
from the department of nitpicking:

* In secure_poll() the handling of timeouts is different depending whether poll(), select() or SSL_pending() is used.
Thelatter doesn't use the timeout value at all, and for select() it is impossible to specify indefinite timeout.
 
* occasional "blank" lines consisting of a single tab character -- maybe a left-over from editor auto-indent. Not sure
ofhow much a problem this is, given that the blanks will be removed by pg_indent.
 
* Comment on pq_wait() seems to have a typo: "-1 if an error directly."

I have done limited testing on Linux i686 (HAVE_POLL only) -- the non-blocking
functions behave as expected.

regards,
Martin