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Move Timestamp/Interval typedefs and basic macros into datatype/timestamp.h.

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As per my recent proposal, this refactors things so that these typedefs and
macros are available in a header that can be included in frontend-ish code.
I also changed various headers that were undesirably including
utils/timestamp.h to include datatype/timestamp.h instead.  Unsurprisingly,
this showed that half the system was getting utils/timestamp.h by way of
xlog.h.

No actual code changes here, just header refactoring.
This commit is contained in:
Tom Lane
2011-09-09 13:23:41 -04:00
parent d63de337f3
commit a7801b62f2
43 changed files with 213 additions and 150 deletions
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108
src/include/utils/timestamp.h
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@@ -13,90 +13,10 @@
#ifndef TIMESTAMP_H
#define TIMESTAMP_H
#include <math.h>
#include <limits.h>
#include <float.h>
#include "datatype/timestamp.h"
#include "fmgr.h"
#include "pgtime.h"
#ifdef HAVE_INT64_TIMESTAMP
#include "utils/int8.h"
#endif
/*
* Timestamp represents absolute time.
*
* Interval represents delta time. Keep track of months (and years), days,
* and hours/minutes/seconds separately since the elapsed time spanned is
* unknown until instantiated relative to an absolute time.
*
* Note that Postgres uses "time interval" to mean a bounded interval,
* consisting of a beginning and ending time, not a time span - thomas 97/03/20
*
* We have two implementations, one that uses int64 values with units of
* microseconds, and one that uses double values with units of seconds.
*
* TimeOffset and fsec_t are convenience typedefs for temporary variables
* that are of different types in the two cases. Do not use fsec_t in values
* stored on-disk, since it is not the same size in both implementations.
* Also, fsec_t is only meant for *fractional* seconds; beware of overflow
* if the value you need to store could be many seconds.
*/
#ifdef HAVE_INT64_TIMESTAMP
typedef int64 Timestamp;
typedef int64 TimestampTz;
typedef int64 TimeOffset;
typedef int32 fsec_t; /* fractional seconds (in microseconds) */
#else
typedef double Timestamp;
typedef double TimestampTz;
typedef double TimeOffset;
typedef double fsec_t; /* fractional seconds (in seconds) */
#endif
typedef struct
{
TimeOffset time; /* all time units other than days, months and
* years */
int32 day; /* days, after time for alignment */
int32 month; /* months and years, after time for alignment */
} Interval;
#define MAX_TIMESTAMP_PRECISION 6
#define MAX_INTERVAL_PRECISION 6
/* in both timestamp.h and ecpg/dt.h */
#define DAYS_PER_YEAR 365.25 /* assumes leap year every four years */
#define MONTHS_PER_YEAR 12
/*
* DAYS_PER_MONTH is very imprecise. The more accurate value is
* 365.2425/12 = 30.436875, or '30 days 10:29:06'. Right now we only
* return an integral number of days, but someday perhaps we should
* also return a 'time' value to be used as well. ISO 8601 suggests
* 30 days.
*/
#define DAYS_PER_MONTH 30 /* assumes exactly 30 days per month */
#define HOURS_PER_DAY 24 /* assume no daylight savings time changes */
/*
* This doesn't adjust for uneven daylight savings time intervals or leap
* seconds, and it crudely estimates leap years. A more accurate value
* for days per years is 365.2422.
*/
#define SECS_PER_YEAR (36525 * 864) /* avoid floating-point computation */
#define SECS_PER_DAY 86400
#define SECS_PER_HOUR 3600
#define SECS_PER_MINUTE 60
#define MINS_PER_HOUR 60
#define USECS_PER_DAY INT64CONST(86400000000)
#define USECS_PER_HOUR INT64CONST(3600000000)
#define USECS_PER_MINUTE INT64CONST(60000000)
#define USECS_PER_SEC INT64CONST(1000000)
/*
* Macros for fmgr-callable functions.
@@ -123,8 +43,6 @@ typedef struct
#define PG_RETURN_TIMESTAMPTZ(x) return TimestampTzGetDatum(x)
#define PG_RETURN_INTERVAL_P(x) return IntervalPGetDatum(x)
#define DT_NOBEGIN (-INT64CONST(0x7fffffffffffffff) - 1)
#define DT_NOEND (INT64CONST(0x7fffffffffffffff))
#else /* !HAVE_INT64_TIMESTAMP */
#define DatumGetTimestamp(X) ((Timestamp) DatumGetFloat8(X))
@@ -143,33 +61,9 @@ typedef struct
#define PG_RETURN_TIMESTAMPTZ(x) return TimestampTzGetDatum(x)
#define PG_RETURN_INTERVAL_P(x) return IntervalPGetDatum(x)
#ifdef HUGE_VAL
#define DT_NOBEGIN (-HUGE_VAL)
#define DT_NOEND (HUGE_VAL)
#else
#define DT_NOBEGIN (-DBL_MAX)
#define DT_NOEND (DBL_MAX)
#endif
#endif /* HAVE_INT64_TIMESTAMP */
#define TIMESTAMP_NOBEGIN(j) \
do {(j) = DT_NOBEGIN;} while (0)
#define TIMESTAMP_IS_NOBEGIN(j) ((j) == DT_NOBEGIN)
#define TIMESTAMP_NOEND(j) \
do {(j) = DT_NOEND;} while (0)
#define TIMESTAMP_IS_NOEND(j) ((j) == DT_NOEND)
#define TIMESTAMP_NOT_FINITE(j) (TIMESTAMP_IS_NOBEGIN(j) || TIMESTAMP_IS_NOEND(j))
/*
* Round off to MAX_TIMESTAMP_PRECISION decimal places.
* Note: this is also used for rounding off intervals.
*/
#define TS_PREC_INV 1000000.0
#define TSROUND(j) (rint(((double) (j)) * TS_PREC_INV) / TS_PREC_INV)
#define TIMESTAMP_MASK(b) (1 << (b))
#define INTERVAL_MASK(b) (1 << (b))