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| author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2023-01-25 13:43:11 +0100 |
|---|---|---|
| committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2023-03-07 07:30:44 +0100 |
| commit | aff6af106d58267d0e69f792a0def46b6d52e27c (patch) | |
| tree | e1aa386e830ffad3c25c5b99f719d1468e4fd6f6 /cpukit/score/src/kern_ntptime.c | |
| parent | set_cputicker: use a bool (diff) | |
| download | rtems-aff6af106d58267d0e69f792a0def46b6d52e27c.tar.bz2 | |
Clarify hardpps() parameter name and comment
Since 32c203577a5e by phk in 1999 (Make even more of the PPSAPI
implementations generic), the "nsec" parameter of hardpps() is a time
difference and no longer a time point. Change the name to "delta_nsec"
and adjust the comment.
Remove comment about a clock tick adjustment which is no longer in the code.
Pull Request: https://github.com/freebsd/freebsd-src/pull/640
Reviewed by: imp
Diffstat (limited to 'cpukit/score/src/kern_ntptime.c')
| -rw-r--r-- | cpukit/score/src/kern_ntptime.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/cpukit/score/src/kern_ntptime.c b/cpukit/score/src/kern_ntptime.c index 1233166a61..0d982e397b 100644 --- a/cpukit/score/src/kern_ntptime.c +++ b/cpukit/score/src/kern_ntptime.c @@ -862,11 +862,11 @@ hardupdate(offset) * variables, except for the actual time and frequency variables, which * are determined by this routine and updated atomically. * - * tsp - time at PPS - * nsec - hardware counter at PPS + * tsp - time at current PPS event + * delta_nsec - time elapsed between the previous and current PPS event */ void -hardpps(struct timespec *tsp, long nsec) +hardpps(struct timespec *tsp, long delta_nsec) { long u_sec, u_nsec, v_nsec; /* temps */ l_fp ftemp; @@ -903,12 +903,9 @@ hardpps(struct timespec *tsp, long nsec) /* * Compute the difference between the current and previous * counter values. If the difference exceeds 0.5 s, assume it - * has wrapped around, so correct 1.0 s. If the result exceeds - * the tick interval, the sample point has crossed a tick - * boundary during the last second, so correct the tick. Very - * intricate. + * has wrapped around, so correct 1.0 s. */ - u_nsec = nsec; + u_nsec = delta_nsec; if (u_nsec > (NANOSECOND >> 1)) u_nsec -= NANOSECOND; else if (u_nsec < -(NANOSECOND >> 1)) |