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Attached patch gets rid of the global timezone in the following steps:

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* Changes the APIs to the timezone functions to take a pg_tz pointer as
an argument, representing the timezone to use for the selected
operation.

* Adds a global_timezone variable that represents the current timezone
in the backend as set by SET TIMEZONE (or guc, or env, etc).

* Implements a hash-table cache of loaded tables, so we don't have to
read and parse the TZ file everytime we change a timezone. While not
necesasry now (we don't change timezones very often), I beleive this
will be necessary (or at least good) when "multiple timezones in the
same query" is eventually implemented. And code-wise, this was the time
to do it.


There are no user-visible changes at this time. Implementing the
"multiple zones in one query" is a later step...

This also gets rid of some of the cruft needed to "back out a timezone
change", since we previously couldn't check a timezone unless it was
activated first.

Passes regression tests on win32, linux (slackware 10) and solaris x86.

Magnus Hagander
This commit is contained in:
Bruce Momjian
2005-04-19 03:13:59 +00:00
parent dd39dd232f
commit aa8bdab272
11 changed files with 234 additions and 192 deletions
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6
src/backend/utils/adt/nabstime.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.127 2004/12/31 22:01:22 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.128 2005/04/19 03:13:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -192,7 +192,7 @@ abstime2tm(AbsoluteTime _time, int *tzp, struct pg_tm * tm, char **tzn)
time -= CTimeZone;
if ((!HasCTZSet) && (tzp != NULL))
tx = pg_localtime(&time);
tx = pg_localtime(&time,global_timezone);
else
tx = pg_gmtime(&time);
@ -1677,7 +1677,7 @@ timeofday(PG_FUNCTION_ARGS)
gettimeofday(&tp, &tpz);
tt = (pg_time_t) tp.tv_sec;
pg_strftime(templ, sizeof(templ), "%a %b %d %H:%M:%S.%%06d %Y %Z",
pg_localtime(&tt));
pg_localtime(&tt,global_timezone));
snprintf(buf, sizeof(buf), templ, tp.tv_usec);
len = VARHDRSZ + strlen(buf);