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- Log -----------------------------------------------------------------
commit 1269629d90b28a23ef9742645cfaf657ea3165bb
Author: Samuel Thibault <[email protected]>
Date: Sun Sep 21 18:58:16 2025 +0200
clock: Note that the hpc support is not smp safe yet
commit c33f27196d9cb072d48bf5389bb64ad99a0d735a
Author: Damien Zammit <[email protected]>
Date: Sun Sep 21 09:14:04 2025 +0000
mach_clock: Fix monotonic clock sometimes going backwards
Between reading mtime and reading hpclock_read_counter,
there may be an interrupt that updates mtime, therefore
we need a check to perform the clock read process again
in this case.
TESTED: on UP using:
```
\#include <stdio.h>
\#include <time.h>
int main()
{
struct timespec ts, now;
int i;
int cnt = 0;
clock_gettime(CLOCK_MONOTONIC, &ts);
for (i = 0; i < 10000000; i++) {
clock_gettime(CLOCK_MONOTONIC, &now);
if ((now.tv_nsec < ts.tv_nsec) && (now.tv_sec <= ts.tv_sec)) {
printf("BACKWARDS\n");
cnt++;
printf(" %u %09lu\n %u %09lu\n\n",
ts.tv_sec, ts.tv_nsec,
now.tv_sec, now.tv_nsec
);
}
ts = now;
}
printf("went backwards %d out of %d times\n", cnt, i);
return 0;
}
```
Before the change, some backward transitions were detected.
After this change, none were detected.
Message-ID: <[email protected]>
-----------------------------------------------------------------------
Summary of changes:
kern/mach_clock.c | 23 ++++++++++++++++-------
1 file changed, 16 insertions(+), 7 deletions(-)
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