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sched/timer: add support of CLOCK_MONOTONIC

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Reference here:
https://pubs.opengroup.org/onlinepubs/009695399/functions/timer_create.html

DESCRIPTION
...
  Each implementation shall define a set of clocks that can be
  used as timing bases for per-process timers. All implementations
  shall support a clock_id of CLOCK_REALTIME.

  *** If the Monotonic Clock option is supported, implementations shall
  support a clock_id of CLOCK_MONOTONIC. ***
...

Change-Id: Ia8e7302ed4a7e9ec11a0059bd68e9674ea942001
Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an 2020-10-29 11:10:26 +08:00 committed by Matias N
parent 728c3fc409
commit 723698c787
3 changed files with 11 additions and 9 deletions
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1
sched/timer/timer.h
View File

@ -50,6 +50,7 @@ struct posix_timer_s
{ {
FAR struct posix_timer_s *flink; FAR struct posix_timer_s *flink;
clockid_t pt_clock; /* Specifies the clock to use as the timing base. */
uint8_t pt_flags; /* See PT_FLAGS_* definitions */ uint8_t pt_flags; /* See PT_FLAGS_* definitions */
uint8_t pt_crefs; /* Reference count */ uint8_t pt_crefs; /* Reference count */
pid_t pt_owner; /* Creator of timer */ pid_t pt_owner; /* Creator of timer */

12
sched/timer/timer_create.c
View File

@ -124,8 +124,7 @@ static FAR struct posix_timer_s *timer_allocate(void)
* value of the timer ID. * value of the timer ID.
* *
* Each implementation defines a set of clocks that can be used as timing * Each implementation defines a set of clocks that can be used as timing
* bases for per-thread timers. All implementations shall support a * bases for per-thread timers.
* clock_id of CLOCK_REALTIME.
* *
* Input Parameters: * Input Parameters:
* clockid - Specifies the clock to use as the timing base. * clockid - Specifies the clock to use as the timing base.
@ -157,9 +156,13 @@ int timer_create(clockid_t clockid, FAR struct sigevent *evp,
{ {
FAR struct posix_timer_s *ret; FAR struct posix_timer_s *ret;
/* Sanity checks. Also, we support only CLOCK_REALTIME */ /* Sanity checks. */
if (timerid == NULL || clockid != CLOCK_REALTIME) if (timerid == NULL || (clockid != CLOCK_REALTIME
#ifdef CONFIG_CLOCK_MONOTONIC
&& clockid != CLOCK_MONOTONIC
#endif /* CONFIG_CLOCK_MONOTONIC */
))
{ {
set_errno(EINVAL); set_errno(EINVAL);
return ERROR; return ERROR;
@ -176,6 +179,7 @@ int timer_create(clockid_t clockid, FAR struct sigevent *evp,
/* Initialize the timer instance */ /* Initialize the timer instance */
ret->pt_clock = clockid;
ret->pt_crefs = 1; ret->pt_crefs = 1;
ret->pt_owner = getpid(); ret->pt_owner = getpid();
ret->pt_delay = 0; ret->pt_delay = 0;

7
sched/timer/timer_settime.c
View File

@ -285,12 +285,9 @@ int timer_settime(timer_t timerid, int flags,
if ((flags & TIMER_ABSTIME) != 0) if ((flags & TIMER_ABSTIME) != 0)
{ {
/* Calculate a delay corresponding to the absolute time in 'value'. /* Calculate a delay corresponding to the absolute time in 'value' */
* NOTE: We have internal knowledge the clock_abstime2ticks only
* returns an error if clockid != CLOCK_REALTIME.
*/
clock_abstime2ticks(CLOCK_REALTIME, &value->it_value, &delay); clock_abstime2ticks(timer->pt_clock, &value->it_value, &delay);
} }
else else
{ {