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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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44
src/timezone/pgtz.h
View File

@ -9,15 +9,57 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/pgtz.h,v 1.10 2004/12/31 22:03:59 pgsql Exp $
* $PostgreSQL: pgsql/src/timezone/pgtz.h,v 1.11 2005/04/19 03:13:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef _PGTZ_H
#define _PGTZ_H
#include "tzfile.h"
#define TZ_STRLEN_MAX 255
extern char *pg_TZDIR(void);
#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
struct ttinfo
{ /* time type information */
long tt_gmtoff; /* UTC offset in seconds */
int tt_isdst; /* used to set tm_isdst */
int tt_abbrind; /* abbreviation list index */
int tt_ttisstd; /* TRUE if transition is std time */
int tt_ttisgmt; /* TRUE if transition is UTC */
};
struct lsinfo
{ /* leap second information */
pg_time_t ls_trans; /* transition time */
long ls_corr; /* correction to apply */
};
struct state
{
int leapcnt;
int timecnt;
int typecnt;
int charcnt;
pg_time_t ats[TZ_MAX_TIMES];
unsigned char types[TZ_MAX_TIMES];
struct ttinfo ttis[TZ_MAX_TYPES];
char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, 3 /* sizeof gmt */),
(2 * (TZ_STRLEN_MAX + 1)))];
struct lsinfo lsis[TZ_MAX_LEAPS];
};
struct pg_tz {
char TZname[TZ_STRLEN_MAX + 1];
struct state state;
};
int tzload(const char *name, struct state * sp);
int tzparse(const char *name, struct state * sp, int lastditch);
#endif /* _PGTZ_H */