116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
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/****************************************************************
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* *
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* Copyright 2001 Sanchez Computer Associates, Inc. *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/*
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* --------------------------------------------------------------
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* This file contains system independent routines for time handling
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* --------------------------------------------------------------
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*/
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#include "mdef.h"
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#include "gt_timer.h"
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/*
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* ----------------------------------
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* Compare 2 absolute times
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*
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* Return:
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* -1 - atp1 < atp2
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* 0 - atp1 = atp2
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* 1 - atp1 > atp2
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* ----------------------------------
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*/
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int4 abs_time_comp(ABS_TIME *atp1, ABS_TIME *atp2)
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{
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if (atp1->at_sec > atp2->at_sec)
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return (1);
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if (atp1->at_sec < atp2->at_sec)
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return (-1);
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if (atp1->at_usec == atp2->at_usec)
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return (0);
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if (atp1->at_usec > atp2->at_usec)
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return (1);
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return (-1);
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}
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/*
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* ---------------------------------------------------------------------
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* Add integer to absolute time
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* Absolute time structure is seconds & microseconds.
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* Integer value is in milliseconds.
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*
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* Arguments:
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* atps - source time structure
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* ival - integer to be added to source structure (milliseconds)
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* atpd - destination time structure
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* ---------------------------------------------------------------------
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*/
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void add_int_to_abs_time(ABS_TIME *atps, int4 ival,ABS_TIME *atpd)
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{
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int4 ival_sec, ival_usec;
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error_def (ERR_TIMEROVFL);
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if (ival < 0)
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{
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/* Negative values won't work properly; they're probably
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* also an indication of arithmetic overflow when
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* multiplying by 1000 to convert from seconds to
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* milliseconds.
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*/
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rts_error(VARLSTCNT(1) ERR_TIMEROVFL);
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}
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ival_sec = ival / 1000; /* milliseconds -> seconds */
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ival_usec = (ival - (ival_sec * 1000)) * 1000; /* microsecond remainder */
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atpd->at_sec = atps->at_sec + ival_sec;
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if ((atpd->at_usec = atps->at_usec + ival_usec) >= 1000000)
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{
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/* microsecond overflow */
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atpd->at_usec -= 1000000;
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atpd->at_sec += 1; /* carry */
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}
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}
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/*
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* ------------------------------------------------------
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* Substract absolute time atp2 from absolute time atp1
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* Absolute time structure is seconds & microseconds.
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* Integer value is in milliseconds.
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*
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* Arguments:
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* atp1 - source time structure
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* atp2 - destination time structure
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*
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* Return:
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* difference time structure
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* ------------------------------------------------------
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*/
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ABS_TIME sub_abs_time(ABS_TIME *atp1, ABS_TIME *atp2)
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{
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ABS_TIME dat;
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int4 ival;
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dat.at_sec = atp1->at_sec - atp2->at_sec;
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dat.at_usec = atp1->at_usec - atp2->at_usec;
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if (atp2->at_usec > atp1->at_usec)
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{
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dat.at_usec += 1000000;
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dat.at_sec--;
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}
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return (dat);
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}
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