Public bug reported:
Surprisingly, clock_gettime() bracketed by time() before and after,
returns a value that is outside that interval.
$ taskset 1 time /tmp/testtime
before 1435271727
time 1435271728.0917
after 1435271727
0.57user 0.00system 0:00.57elapsed 100%CPU (0avgtext+0avgdata 464maxresident)k
0inputs+0outputs (0major+157minor)pagefaults 0swaps
$ uname -a
Linux salvador 3.13.0-38-generic #65-Ubuntu SMP Thu Oct 9 11:36:50 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
#include <unistd.h>
#include <time.h>
#include <assert.h>
#include <stdio.h>
int main()
{
time_t before, after;
struct timespec ts;
while (1) {
before = time(0);
clock_gettime(CLOCK_REALTIME, &ts);
after = time(0);
if (ts.tv_sec < before || after < ts.tv_sec) {
fprintf(stderr, "before %lu\n", before);
fprintf(stderr, "time %lu.09%lu\n", ts.tv_sec, ts.tv_nsec);
fprintf(stderr, "after %lu\n", after);
break;
}
}
return 0;
}
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1468932
Title:
Values returned by time() are not consistent with value returned by
clock_gettime()
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