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Re: [PATCHES] BUG #2569: statement_timeout bug on Windows

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org, James <im-james(at)hotmail(dot)com>, pgsql-bugs(at)postgresql(dot)org, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: [PATCHES] BUG #2569: statement_timeout bug on Windows
Date: 2006-08-09 20:41:26
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Lists: pgsql-bugspgsql-hackerspgsql-patches
Tom Lane wrote:
> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> ! 				/* WaitForSingleObjectEx() uses milliseconds */
> > ! 				waittime = timerCommArea.value.it_value.tv_usec / 1000 + timerCommArea.value.it_value.tv_sec * 1000;
> Seems like this probably ought to round up not down:
> 	waittime = (timerCommArea.value.it_value.tv_usec + 999) / 1000 + timerCommArea.value.it_value.tv_sec * 1000;
> Otherwise, an attempt to wait for 100 usec would convert to waittime 0,
> which seems like a bad thing.  In general the semantics of timed waits
> are always supposed to be "you wait at least this long".

I thought about that, but because statement_timeout is in millis, and
not micros, we can't have a value that gets rounded down.   I am
thinking a cleaner solution is to check for secs and if that is 0 and
microsecs < 1000, you set millis = 1.

Patch attached and applied to head and 8.1.X.

  Bruce Momjian   bruce(at)momjian(dot)us

  + If your life is a hard drive, Christ can be your backup. +

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