gettimeofday() goes backwards on FreeBSD 4.9 - Mailing list pgsql-hackers

I said:
> I'm wondering if there's an actual bug in gettimeofday() in this
> platform, such that once in a while it returns a value that's off
> a minute or so ...

Whoa.  Try the following test program.  Then send it in to your friendly
local BSD hackers ....

> uname -a
FreeBSD pgsql74.hub.org 4.9-PRERELEASE FreeBSD 4.9-PRERELEASE #3: Sat Sep 20 14:16:48 ADT 2003
root@neptune.hub.org:/usr/obj/usr/src/sys/kernel i386
 

> ./a.out
out of order tv_sec: 1070050646 939970, prev 1070051342 516165
out of order tv_sec: 1070051342 789127, prev 1070050646 939970
out of order tv_usec: 1070051342 789127, prev 1070050646 939970
out of order tv_sec: 1070050654 690255, prev 1070051350 216448
out of order tv_sec: 1070051350 402412, prev 1070050654 690255
out of order tv_usec: 1070051350 402412, prev 1070050654 690255
out of order tv_sec: 1070050672 990359, prev 1070051368 416546
out of order tv_sec: 1070051368 501648, prev 1070050672 990359
out of order tv_usec: 1070051368 501648, prev 1070050672 990359
out of order tv_sec: 1070050672 990363, prev 1070051368 516557
out of order tv_sec: 1070051368 700227, prev 1070050672 990363
out of order tv_usec: 1070051368 700227, prev 1070050672 990363
out of order tv_sec: 1070050675 740524, prev 1070051371 216718
out of order tv_sec: 1070051371 346521, prev 1070050675 740524
out of order tv_usec: 1070051371 346521, prev 1070050675 740524
out of order tv_sec: 1070050676 440415, prev 1070051371 916605
out of order tv_usec: 1070050676 440415, prev 1070051371 916605
out of order tv_sec: 1070051372 238348, prev 1070050676 440415
out of order tv_usec: 1070051372 238348, prev 1070050676 440415
^C
> 
        regards, tom lane


#include <stdio.h>
#include <sys/time.h>

int
main()
{struct timeval prevtime;struct timeval curtime;
gettimeofday(&prevtime, NULL);
for (;;){    gettimeofday(&curtime, NULL);
    if (curtime.tv_usec < 0 || curtime.tv_usec >= 1000000)        fprintf(stderr, "bogus tv_usec: %ld %ld, prev %ld
%ld\n",               (long int) curtime.tv_sec,                (long int) curtime.tv_usec,                (long int)
prevtime.tv_sec,               (long int) prevtime.tv_usec);
 
    if (curtime.tv_sec < prevtime.tv_sec ||        curtime.tv_sec > prevtime.tv_sec + 1)        fprintf(stderr, "out of
ordertv_sec: %ld %ld, prev %ld %ld\n",                (long int) curtime.tv_sec,                (long int)
curtime.tv_usec,               (long int) prevtime.tv_sec,                (long int) prevtime.tv_usec);
 
    if (curtime.tv_usec < prevtime.tv_usec &&        curtime.tv_sec != prevtime.tv_sec + 1)        fprintf(stderr, "out
oforder tv_usec: %ld %ld, prev %ld %ld\n",                (long int) curtime.tv_sec,                (long int)
curtime.tv_usec,               (long int) prevtime.tv_sec,                (long int) prevtime.tv_usec);
 
    prevtime = curtime;}
return 0;
}