blob: 5abfcc4d2964d902a2ad79d61af7fef8596f697a [file] [log] [blame]
/*
* Time calculation functions.
*
* Copyright 2000-2006 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <sys/time.h>
#include <common/config.h>
#include <common/time.h>
struct timeval now; /* the current date at any moment */
struct timeval start_date; /* the process's start date */
/*
* adds <ms> ms to <from>, set the result to <tv> and returns a pointer <tv>
*/
struct timeval *tv_delayfrom(struct timeval *tv, struct timeval *from, int ms)
{
if (!tv || !from)
return NULL;
tv->tv_usec = from->tv_usec + (ms%1000)*1000;
tv->tv_sec = from->tv_sec + (ms/1000);
while (tv->tv_usec >= 1000000) {
tv->tv_usec -= 1000000;
tv->tv_sec++;
}
return tv;
}
/*
* compares <tv1> and <tv2> modulo 1ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2
* Must not be used when either argument is eternity. Use tv_cmp2_ms() for that.
*/
int tv_cmp_ms(struct timeval *tv1, struct timeval *tv2)
{
if (tv1->tv_sec == tv2->tv_sec) {
if (tv2->tv_usec >= tv1->tv_usec + 1000)
return -1;
else if (tv1->tv_usec >= tv2->tv_usec + 1000)
return 1;
else
return 0;
}
else if ((tv2->tv_sec > tv1->tv_sec + 1) ||
((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000)))
return -1;
else if ((tv1->tv_sec > tv2->tv_sec + 1) ||
((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000)))
return 1;
else
return 0;
}
/*
* compares <tv1> and <tv2> : returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
* considering that 0 is the eternity.
*/
int tv_cmp2(struct timeval *tv1, struct timeval *tv2)
{
if (tv_iseternity(tv1))
if (tv_iseternity(tv2))
return 0; /* same */
else
return 1; /* tv1 later than tv2 */
else if (tv_iseternity(tv2))
return -1; /* tv2 later than tv1 */
if (tv1->tv_sec > tv2->tv_sec)
return 1;
else if (tv1->tv_sec < tv2->tv_sec)
return -1;
else if (tv1->tv_usec > tv2->tv_usec)
return 1;
else if (tv1->tv_usec < tv2->tv_usec)
return -1;
else
return 0;
}
/*
* compares <tv1> and <tv2> modulo 1 ms: returns 0 if equal, -1 if tv1 < tv2, 1 if tv1 > tv2,
* considering that 0 is the eternity.
*/
int tv_cmp2_ms(struct timeval *tv1, struct timeval *tv2)
{
if (tv_iseternity(tv1))
if (tv_iseternity(tv2))
return 0; /* same */
else
return 1; /* tv1 later than tv2 */
else if (tv_iseternity(tv2))
return -1; /* tv2 later than tv1 */
if (tv1->tv_sec == tv2->tv_sec) {
if (tv1->tv_usec >= tv2->tv_usec + 1000)
return 1;
else if (tv2->tv_usec >= tv1->tv_usec + 1000)
return -1;
else
return 0;
}
else if ((tv1->tv_sec > tv2->tv_sec + 1) ||
((tv1->tv_sec == tv2->tv_sec + 1) && (tv1->tv_usec + 1000000 >= tv2->tv_usec + 1000)))
return 1;
else if ((tv2->tv_sec > tv1->tv_sec + 1) ||
((tv2->tv_sec == tv1->tv_sec + 1) && (tv2->tv_usec + 1000000 >= tv1->tv_usec + 1000)))
return -1;
else
return 0;
}
/*
* returns the remaining time between tv1=now and event=tv2
* if tv2 is passed, 0 is returned.
* Returns TIME_ETERNITY if tv2 is eternity.
*/
unsigned long tv_remain2(struct timeval *tv1, struct timeval *tv2)
{
unsigned long ret;
if (tv_iseternity(tv2))
return TIME_ETERNITY;
if (tv_cmp_ms(tv1, tv2) >= 0)
return 0; /* event elapsed */
ret = (tv2->tv_sec - tv1->tv_sec) * 1000;
if (tv2->tv_usec > tv1->tv_usec)
ret += (tv2->tv_usec - tv1->tv_usec) / 1000;
else
ret -= (tv1->tv_usec - tv2->tv_usec) / 1000;
return (unsigned long) ret;
}
/*
* returns the absolute difference, in ms, between tv1 and tv2
* Must not be used when either argument is eternity.
*/
unsigned long tv_delta(struct timeval *tv1, struct timeval *tv2)
{
int cmp;
unsigned long ret;
cmp = tv_cmp(tv1, tv2);
if (!cmp)
return 0; /* same dates, null diff */
else if (cmp < 0) {
struct timeval *tmp = tv1;
tv1 = tv2;
tv2 = tmp;
}
ret = (tv1->tv_sec - tv2->tv_sec) * 1000;
if (tv1->tv_usec > tv2->tv_usec)
ret += (tv1->tv_usec - tv2->tv_usec) / 1000;
else
ret -= (tv2->tv_usec - tv1->tv_usec) / 1000;
return (unsigned long) ret;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/