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Tweak AbsoluteTimeIsReal() to avoid compiler bugs on machines where 

a > comparison against INT_MIN may do the wrong thing.  Per suggestion
from Andreas.
This commit is contained in:
Tom Lane 2000-11-18 05:41:45 +00:00
parent 6ba959eee0
commit 0514ad126b
1 changed files with 12 additions and 23 deletions
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35
src/include/utils/nabstime.h
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@ -7,13 +7,14 @@
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nabstime.h,v 1.26 2000/06/09 01:11:15 tgl Exp $
* $Id: nabstime.h,v 1.27 2000/11/18 05:41:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef NABSTIME_H
#define NABSTIME_H
#include <limits.h>
#include <time.h>
#include "fmgr.h"
@ -78,37 +79,25 @@ typedef TimeIntervalData *TimeInterval;
#define CURRENT_ABSTIME ((AbsoluteTime) 0x7FFFFFFD) /* 2147483646 (2^31 - 2) */
#define NOEND_ABSTIME ((AbsoluteTime) 0x7FFFFFFC) /* 2147483645 (2^31 - 3) */
#define BIG_ABSTIME ((AbsoluteTime) 0x7FFFFFFB) /* 2147483644 (2^31 - 4) */
#if defined(_AIX)
/*
* AIX considers 2147483648 == -2147483648 (since they have the same bit
* representation) but uses a different sign sense in a comparison to
* these integer constants depending on whether the constant is signed
* or not!
*/
#define NOSTART_ABSTIME ((AbsoluteTime) INT_MIN)
#else
#define NOSTART_ABSTIME ((AbsoluteTime) 0x80000001) /* -2147483647 (- 2^31) */
#endif /* _AIX */
#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))
((bool) (((AbsoluteTime) (time)) < NOEND_ABSTIME && \
((AbsoluteTime) (time)) != NOSTART_ABSTIME))
#define RelativeTimeIsValid(time) \
((bool) (((RelativeTime) time) != INVALID_RELTIME))
/*
* getSystemTime
* Returns system time.
*/
#define getSystemTime() \
((time_t) (time(0l)))
((bool) (((RelativeTime) (time)) != INVALID_RELTIME))
/*