/*------------------------------------------------------------------------- * * nabstime.h * Definitions for the "new" abstime code. * * * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/nabstime.h * *------------------------------------------------------------------------- */ #ifndef NABSTIME_H #define NABSTIME_H #include #include "fmgr.h" #include "pgtime.h" /* ---------------------------------------------------------------- * * time types + support macros * * ---------------------------------------------------------------- */ /* * Although time_t generally is a long int on 64 bit systems, these two * types must be 4 bytes, because that's what pg_type.h assumes. They * should be yanked (long) before 2038 and be replaced by timestamp and * interval. */ typedef int32 AbsoluteTime; typedef int32 RelativeTime; typedef struct { int32 status; AbsoluteTime data[2]; } TimeIntervalData; typedef TimeIntervalData *TimeInterval; /* * Macros for fmgr-callable functions. */ #define DatumGetAbsoluteTime(X) ((AbsoluteTime) DatumGetInt32(X)) #define DatumGetRelativeTime(X) ((RelativeTime) DatumGetInt32(X)) #define DatumGetTimeInterval(X) ((TimeInterval) DatumGetPointer(X)) #define AbsoluteTimeGetDatum(X) Int32GetDatum(X) #define RelativeTimeGetDatum(X) Int32GetDatum(X) #define TimeIntervalGetDatum(X) PointerGetDatum(X) #define PG_GETARG_ABSOLUTETIME(n) DatumGetAbsoluteTime(PG_GETARG_DATUM(n)) #define PG_GETARG_RELATIVETIME(n) DatumGetRelativeTime(PG_GETARG_DATUM(n)) #define PG_GETARG_TIMEINTERVAL(n) DatumGetTimeInterval(PG_GETARG_DATUM(n)) #define PG_RETURN_ABSOLUTETIME(x) return AbsoluteTimeGetDatum(x) #define PG_RETURN_RELATIVETIME(x) return RelativeTimeGetDatum(x) #define PG_RETURN_TIMEINTERVAL(x) return TimeIntervalGetDatum(x) /* * Reserved values * Epoch is Unix system time zero, but needs to be kept as a reserved * value rather than converting to time since timezone calculations * might move it away from 1970-01-01 00:00:00Z - tgl 97/02/20 * * Pre-v6.1 code had large decimal numbers for reserved values. * These were chosen as special 32-bit bit patterns, * so redefine them explicitly using these bit patterns. - tgl 97/02/24 */ #define INVALID_ABSTIME ((AbsoluteTime) 0x7FFFFFFE) /* 2147483647 (2^31 - 1) */ #define NOEND_ABSTIME ((AbsoluteTime) 0x7FFFFFFC) /* 2147483645 (2^31 - 3) */ #define NOSTART_ABSTIME ((AbsoluteTime) INT_MIN) /* -2147483648 */ #define INVALID_RELTIME ((RelativeTime) 0x7FFFFFFE) /* 2147483647 (2^31 - 1) */ #define AbsoluteTimeIsValid(time) \ ((bool) ((time) != INVALID_ABSTIME)) /* * Because NOSTART_ABSTIME is defined as INT_MIN, there can't be any * AbsoluteTime values less than it. Therefore, we can code the test * "time > NOSTART_ABSTIME" as "time != NOSTART_ABSTIME", which avoids * compiler bugs on some platforms. --- tgl & az, 11/2000 */ #define AbsoluteTimeIsReal(time) \ ((bool) (((AbsoluteTime) (time)) < NOEND_ABSTIME && \ ((AbsoluteTime) (time)) != NOSTART_ABSTIME)) #define RelativeTimeIsValid(time) \ ((bool) (((RelativeTime) (time)) != INVALID_RELTIME)) /* non-fmgr-callable support routines */ extern AbsoluteTime GetCurrentAbsoluteTime(void); extern void abstime2tm(AbsoluteTime time, int *tzp, struct pg_tm *tm, char **tzn); #endif /* NABSTIME_H */