Commit Graph

14 Commits

Author SHA1 Message Date
Michal Lenc
360e938fa6 sched: add support for adjtime() interface
This commit adds Linux like adjtime() interface that is used to correct
the system time clock if it varies from real value. The adjustment is
done by slight adjustment of clock period and therefore the adjustment
is without time jumps (both forward and backwards)

The implementation is enabled by CONFIG_CLOCK_ADJTIME and separated from
CONFIG_CLOCK_TIMEKEEPING functions. Options CONFIG_CLOCK_ADJTIME_SLEWLIMIT
and CONFIG_CLOCK_ADJTIME_PERIOD can be used to control the adjustment
speed.

Interfaces up_get_timer_period() and up_adj_timer_period() has to be
defined by architecture level support.

This is not a POSIX interface but derives from 4.3BSD, System V.
It is also supported for Linux compatibility.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
2023-04-25 14:37:50 -03:00
Jukka Laitinen
c79d2067c7 Move timespec calculations from sched into libc/sched
Allow using these functions also outside sched, where systick
related calculations are performed

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
2021-11-04 13:19:01 -05:00
Alin Jerpelea
8935ac4cc3 sched: Author Gregory Nutt: update licenses to Apache
Gregory Nutt has submitted the SGA and we can mograte the licenses
to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-02-09 01:21:53 -08:00
Xiang Xiao
517974787f Rename clock_systime[r|spec] to clock_systime_[ticks|timespec]
follow up the new naming convention:
https://cwiki.apache.org/confluence/display/NUTTX/Naming+of+OS+Internal+Functions
2020-05-10 14:35:50 -06:00
Gregory Nutt
8fca244f36 syscall: clock_systimer() is no longer a system call. It has been replaced with the equivalent, standard interface clock() as the system call.
sched/clock:  Move the implementation of clock() from libs/libc/time to sched/clock.  This is necessary because it calls the (now) internal OS function clock_systimer.  clock() is now accessed only via a system call in certain configuratins.
libs/libc/wqueue:  Replace calls to clock_systimer() with calls to the equivalent clock().
2018-06-16 12:50:28 -06:00
Gregory Nutt
94d34bba47 Fix a typo in a Make.defs file 2016-07-28 09:46:28 -06:00
Gregory Nutt
246773faa7 Rename CONFIG_SCHED_TIMEKEEPING to CONFIG_CLOCK_TIMEKEEPING. That is a better compartmentalized name. 2016-07-11 06:54:02 -06:00
Max Neklyudov
8db29071da timekeeping: initial implementation 2016-07-10 16:14:25 -06:00
Gregory Nutt
84d4cb007b clock_systimer: 64-bit timer accesses are not atomic. Noted by Freddie Chopin. 2016-01-22 12:24:36 -06:00
Gregory Nutt
99664b7811 Sporadic scheduler: Add logic to collection the partial timer expiration when a sporadic thread is suspended in tickless mode 2015-07-26 15:03:47 -06:00
Gregory Nutt
147042218b gettimeofday() and settimeofday(): Move gittimeofdady() from sched/clock to libc/time. All remove gettimeofday() from NuttX system calls. It is only a wrapper around clock_settime() and does not need a trap. gettimeofday() is no longer tried as a core OS interface.
gettimeofday has been decremented in POSIX 2008.  settimeofday() was never part of POSIX, but I decided to add it to libc as well just for symmetry.
2015-02-12 11:10:46 -06:00
Gregory Nutt
322f9f401c Simplify how C source files are selected in the build 2014-10-07 07:42:36 -06:00
Gregory Nutt
eed1d6c619 When reading the system timer, don't read a struct timespec, convert it to a fake tick count, then back to a timespec. Remove CLOCK_ACTIVETIME.. it is non-standard, unused, and gets in the way of changes like this 2014-08-15 03:55:41 -06:00
Gregory Nutt
d4b56eb3cc Move clock functions from sched/ to sched/clock 2014-08-08 14:43:02 -06:00