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Merge pull request #10697 from donaldsharp/free_bsd_clock_gettime

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lib: Fix FreeBSD clock_gettime(CLOCK_THREAD_CPUTIME_ID,..) going back…
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Jafar Al-Gharaibeh 2022-03-01 12:48:47 -06:00 committed by GitHub
commit ec616c97ba
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1 changed files with 21 additions and 0 deletions
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lib/thread.c
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@ -1884,6 +1884,27 @@ unsigned long thread_consumed_time(RUSAGE_T *now, RUSAGE_T *start,
unsigned long *cputime)
{
#ifdef HAVE_CLOCK_THREAD_CPUTIME_ID
#ifdef __FreeBSD__
/*
* FreeBSD appears to have an issue when calling clock_gettime
* with CLOCK_THREAD_CPUTIME_ID really close to each other
* occassionally the now time will be before the start time.
* This is not good and FRR is ending up with CPU HOG's
* when the subtraction wraps to very large numbers
*
* What we are going to do here is cheat a little bit
* and notice that this is a problem and just correct
* it so that it is impossible to happen
*/
if (start->cpu.tv_sec == now->cpu.tv_sec &&
start->cpu.tv_nsec > now->cpu.tv_nsec)
now->cpu.tv_nsec = start->cpu.tv_nsec + 1;
else if (start->cpu.tv_sec > now->cpu.tv_sec) {
now->cpu.tv_sec = start->cpu.tv_sec;
now->cpu.tv_nsec = start->cpu.tv_nsec + 1;
}
#endif
*cputime = (now->cpu.tv_sec - start->cpu.tv_sec) * TIMER_SECOND_MICRO
+ (now->cpu.tv_nsec - start->cpu.tv_nsec) / 1000;
#else