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Clean up the rather historically encumbered interface to now() and

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current time: provide a GetCurrentTimestamp() function that returns
current time in the form of a TimestampTz, instead of separate time_t
and microseconds fields.  This is what all the callers really want
anyway, and it eliminates low-level dependencies on AbsoluteTime,
which is a deprecated datatype that will have to disappear eventually.
This commit is contained in:
Tom Lane
2005-06-29 22:51:57 +00:00
parent c33d575899
commit b5f7cff84f
19 changed files with 135 additions and 213 deletions
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46
src/backend/utils/adt/timestamp.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.126 2005/06/15 00:34:09 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.127 2005/06/29 22:51:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -28,6 +28,8 @@
#include "parser/scansup.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/datetime.h"
/*
* gcc's -ffast-math switch breaks routines that expect exact results from
@ -38,6 +40,10 @@
#endif
/* Set at postmaster start */
TimestampTz PgStartTime;
#ifdef HAVE_INT64_TIMESTAMP
static int64 time2t(const int hour, const int min, const int sec, const fsec_t fsec);
@ -927,21 +933,39 @@ EncodeSpecialTimestamp(Timestamp dt, char *str)
Datum
now(PG_FUNCTION_ARGS)
{
TimestampTz result;
AbsoluteTime sec;
int usec;
sec = GetCurrentTransactionStartTimeUsec(&usec);
result = AbsoluteTimeUsecToTimestampTz(sec, usec);
PG_RETURN_TIMESTAMPTZ(result);
PG_RETURN_TIMESTAMPTZ(GetCurrentTransactionStartTimestamp());
}
Datum
pgsql_postmaster_start_time(PG_FUNCTION_ARGS)
{
PG_RETURN_TIMESTAMPTZ(StartTime);
PG_RETURN_TIMESTAMPTZ(PgStartTime);
}
/*
* GetCurrentTimestamp -- get the current operating system time
*
* Result is in the form of a TimestampTz value, and is expressed to the
* full precision of the gettimeofday() syscall
*/
TimestampTz
GetCurrentTimestamp(void)
{
TimestampTz result;
struct timeval tp;
gettimeofday(&tp, NULL);
result = tp.tv_sec -
((POSTGRES_EPOCH_JDATE - UNIX_EPOCH_JDATE) * SECS_PER_DAY);
#ifdef HAVE_INT64_TIMESTAMP
result = (result * USECS_PER_SEC) + tp.tv_usec;
#else
result = result + (tp.tv_usec / 1000000.0);
#endif
return result;
}
void