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posix: implement clock_nanosleep

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Implements the posix clock_nanosleep function, where both relative
and absolute sleeps are made as absolute sleeps.
The nanosleep() function is a special case of clock_nanosleep(),
and so has been refactored to simply call it.

Signed-off-by: Tom Finet <tom.codeninja@gmail.com>
This commit is contained in:
Tom Finet 2023-08-19 18:34:12 +01:00 committed by Martí Bolívar
parent 295eb1b1a0
commit d09a1c39f9
3 changed files with 72 additions and 42 deletions
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2
include/zephyr/posix/time.h
View file

@ -96,6 +96,8 @@ int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
struct itimerspec *ovalue);
int timer_getoverrun(timer_t timerid);
int nanosleep(const struct timespec *rqtp, struct timespec *rmtp);
int clock_nanosleep(clockid_t clock_id, int flags,
const struct timespec *rqtp, struct timespec *rmtp);
#ifdef __cplusplus
}

69
lib/posix/clock.c
View file

@ -106,6 +106,75 @@ int clock_settime(clockid_t clock_id, const struct timespec *tp)
return 0;
}
/**
* @brief Suspend execution for a nanosecond interval, or
* until some absolute time relative to the specified clock.
*
* See IEEE 1003.1
*/
int clock_nanosleep(clockid_t clock_id, int flags, const struct timespec *rqtp,
struct timespec *rmtp)
{
uint64_t ns;
uint64_t us;
uint64_t uptime_ns;
k_spinlock_key_t key;
const bool update_rmtp = rmtp != NULL;
if (!(clock_id == CLOCK_REALTIME || clock_id == CLOCK_MONOTONIC)) {
errno = EINVAL;
return -1;
}
if (rqtp == NULL) {
errno = EFAULT;
return -1;
}
if (rqtp->tv_sec < 0 || rqtp->tv_nsec < 0 || rqtp->tv_nsec >= NSEC_PER_SEC) {
errno = EINVAL;
return -1;
}
if ((flags & TIMER_ABSTIME) == 0 &&
unlikely(rqtp->tv_sec >= ULLONG_MAX / NSEC_PER_SEC)) {
ns = rqtp->tv_nsec + NSEC_PER_SEC
+ k_sleep(K_SECONDS(rqtp->tv_sec - 1)) * NSEC_PER_MSEC;
} else {
ns = rqtp->tv_sec * NSEC_PER_SEC + rqtp->tv_nsec;
}
uptime_ns = k_cyc_to_ns_ceil64(k_cycle_get_32());
if (flags & TIMER_ABSTIME && clock_id == CLOCK_REALTIME) {
key = k_spin_lock(&rt_clock_base_lock);
ns -= rt_clock_base.tv_sec * NSEC_PER_SEC + rt_clock_base.tv_nsec;
k_spin_unlock(&rt_clock_base_lock, key);
}
if ((flags & TIMER_ABSTIME) == 0) {
ns += uptime_ns;
}
if (ns <= uptime_ns) {
goto do_rmtp_update;
}
us = DIV_ROUND_UP(ns, NSEC_PER_USEC);
do {
us = k_sleep(K_TIMEOUT_ABS_US(us)) * 1000;
} while (us != 0);
do_rmtp_update:
if (update_rmtp) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
}
/**
* @brief Get current real time.
*

43
lib/posix/nanosleep.c
View file

@ -20,46 +20,5 @@
*/
int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
{
uint64_t ns;
uint64_t us;
const bool update_rmtp = rmtp != NULL;
if (rqtp == NULL) {
errno = EFAULT;
return -1;
}
if (rqtp->tv_sec < 0 || rqtp->tv_nsec < 0
|| rqtp->tv_nsec >= NSEC_PER_SEC) {
errno = EINVAL;
return -1;
}
if (rqtp->tv_sec == 0 && rqtp->tv_nsec == 0) {
goto do_rmtp_update;
}
if (unlikely(rqtp->tv_sec >= ULLONG_MAX / NSEC_PER_SEC)) {
/* If a user passes this in, we could be here a while, but
* at least it's technically correct-ish
*/
ns = rqtp->tv_nsec + NSEC_PER_SEC
+ k_sleep(K_SECONDS(rqtp->tv_sec - 1)) * NSEC_PER_MSEC;
} else {
ns = rqtp->tv_sec * NSEC_PER_SEC + rqtp->tv_nsec;
}
/* TODO: improve upper bound when hr timers are available */
us = DIV_ROUND_UP(ns, NSEC_PER_USEC);
do {
us = k_usleep(us);
} while (us != 0);
do_rmtp_update:
if (update_rmtp) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
return clock_nanosleep(CLOCK_MONOTONIC, 0, rqtp, rmtp);
}