Re: droped out precise time calculations in src/interfaces/libpq/fe-connect.c

Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
>>Good question. What is going to happen is that select() is going to be
>>passed tv_sec = 1, and it is going to sleep for one second. Now, if
>>select is interrupted, another time() call is going to be made.
>
> There is a very simple answer to this, which I think I suggested to Joe
> originally, but it's not in the code now: the initial calculation of
> finish_time = now() + timeout must add one. This ensures that any
> roundoff error is in the conservative direction of timing out later,
> rather than sooner.

Yes, my bad, I guess.

The thing was that with the extra +1, I was repeatedly getting a wall-clock
time of 2 seconds with a timeout set to 1 second. It seemed odd to have my 1
second timeout automatically turned into 2 seconds every time. With the
current code, I tried a timeout of 1 second at least a 100 times and it always
took about 1 full wall-clock second. But I guess if there is some corner case
that needs it...

Joe