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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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17
src/include/pgtime.h
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/include/pgtime.h,v 1.6 2004/12/31 22:03:19 pgsql Exp $
* $PostgreSQL: pgsql/src/include/pgtime.h,v 1.7 2005/04/19 03:13:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,21 +37,24 @@ struct pg_tm
const char *tm_zone;
};
extern struct pg_tm *pg_localtime(const pg_time_t *timep);
typedef struct pg_tz pg_tz;
extern struct pg_tm *pg_localtime(const pg_time_t *timep, const pg_tz *tz);
extern struct pg_tm *pg_gmtime(const pg_time_t *timep);
extern int pg_next_dst_boundary(const pg_time_t *timep,
long int *before_gmtoff,
int *before_isdst,
pg_time_t *boundary,
long int *after_gmtoff,
int *after_isdst);
int *after_isdst,
const pg_tz *tz);
extern size_t pg_strftime(char *s, size_t max, const char *format,
const struct pg_tm * tm);
extern void pg_timezone_initialize(void);
extern bool pg_tzset(const char *tzname);
extern bool tz_acceptable(void);
extern const char *select_default_timezone(void);
extern const char *pg_get_current_timezone(void);
extern pg_tz *pg_tzset(const char *tzname);
extern bool tz_acceptable(pg_tz *tz);
extern const char *pg_get_timezone_name(pg_tz *tz);
extern pg_tz *global_timezone;
#endif /* _PGTIME_H */