blob: 3eea898e97b1c0611174f813f2baf4c9c1f1855b [file] [log] [blame]
/*
* Copyright (c) 2018 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <kernel.h>
#include <errno.h>
#include <string.h>
#include <sys/printk.h>
#include <posix/time.h>
#define ACTIVE 1
#define NOT_ACTIVE 0
static void zephyr_timer_wrapper(struct k_timer *ztimer);
struct timer_obj {
struct k_timer ztimer;
void (*sigev_notify_function)(sigval val);
sigval val;
struct timespec interval; /* Reload value */
uint32_t reload; /* Reload value in ms */
uint32_t status;
};
K_MEM_SLAB_DEFINE(posix_timer_slab, sizeof(struct timer_obj),
CONFIG_MAX_TIMER_COUNT, 4);
static void zephyr_timer_wrapper(struct k_timer *ztimer)
{
struct timer_obj *timer;
timer = (struct timer_obj *)ztimer;
if (timer->reload == 0U) {
timer->status = NOT_ACTIVE;
}
(timer->sigev_notify_function)(timer->val);
}
/**
* @brief Create a per-process timer.
*
* This API does not accept SIGEV_THREAD as valid signal event notification
* type.
*
* See IEEE 1003.1
*/
int timer_create(clockid_t clockid, struct sigevent *evp, timer_t *timerid)
{
struct timer_obj *timer;
if (clockid != CLOCK_MONOTONIC || evp == NULL ||
(evp->sigev_notify != SIGEV_NONE &&
evp->sigev_notify != SIGEV_SIGNAL)) {
errno = EINVAL;
return -1;
}
if (k_mem_slab_alloc(&posix_timer_slab, (void **)&timer, K_MSEC(100)) == 0) {
(void)memset(timer, 0, sizeof(struct timer_obj));
} else {
errno = ENOMEM;
return -1;
}
timer->sigev_notify_function = evp->sigev_notify_function;
timer->val = evp->sigev_value;
timer->interval.tv_sec = 0;
timer->interval.tv_nsec = 0;
timer->reload = 0U;
timer->status = NOT_ACTIVE;
if (evp->sigev_notify == SIGEV_NONE) {
k_timer_init(&timer->ztimer, NULL, NULL);
} else {
k_timer_init(&timer->ztimer, zephyr_timer_wrapper, NULL);
}
*timerid = (timer_t)timer;
return 0;
}
/**
* @brief Get amount of time left for expiration on a per-process timer.
*
* See IEEE 1003.1
*/
int timer_gettime(timer_t timerid, struct itimerspec *its)
{
struct timer_obj *timer = (struct timer_obj *)timerid;
int32_t remaining, leftover;
int64_t nsecs, secs;
if (timer == NULL) {
errno = EINVAL;
return -1;
}
if (timer->status == ACTIVE) {
remaining = k_timer_remaining_get(&timer->ztimer);
secs = remaining / MSEC_PER_SEC;
leftover = remaining - (secs * MSEC_PER_SEC);
nsecs = (int64_t)leftover * NSEC_PER_MSEC;
its->it_value.tv_sec = (int32_t) secs;
its->it_value.tv_nsec = (int32_t) nsecs;
} else {
/* Timer is disarmed */
its->it_value.tv_sec = 0;
its->it_value.tv_nsec = 0;
}
/* The interval last set by timer_settime() */
its->it_interval = timer->interval;
return 0;
}
/**
* @brief Sets expiration time of per-process timer.
*
* See IEEE 1003.1
*/
int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
struct itimerspec *ovalue)
{
struct timer_obj *timer = (struct timer_obj *) timerid;
uint32_t duration, current;
if (timer == NULL ||
value->it_interval.tv_nsec < 0 ||
value->it_interval.tv_nsec >= NSEC_PER_SEC ||
value->it_value.tv_nsec < 0 ||
value->it_value.tv_nsec >= NSEC_PER_SEC) {
errno = EINVAL;
return -1;
}
/* Save time to expire and old reload value. */
if (ovalue != NULL) {
timer_gettime(timerid, ovalue);
}
/* Stop the timer if the value is 0 */
if ((value->it_value.tv_sec == 0) && (value->it_value.tv_nsec == 0)) {
if (timer->status == ACTIVE) {
k_timer_stop(&timer->ztimer);
}
timer->status = NOT_ACTIVE;
return 0;
}
/* Calculate timer period */
timer->reload = _ts_to_ms(&value->it_interval);
timer->interval.tv_sec = value->it_interval.tv_sec;
timer->interval.tv_nsec = value->it_interval.tv_nsec;
/* Calcaulte timer duration */
duration = _ts_to_ms(&(value->it_value));
if ((flags & TIMER_ABSTIME) != 0) {
current = k_timer_remaining_get(&timer->ztimer);
if (current >= duration) {
duration = 0U;
} else {
duration -= current;
}
}
if (timer->status == ACTIVE) {
k_timer_stop(&timer->ztimer);
}
timer->status = ACTIVE;
k_timer_start(&timer->ztimer, K_MSEC(duration), K_MSEC(timer->reload));
return 0;
}
/**
* @brief Delete a per-process timer.
*
* See IEEE 1003.1
*/
int timer_delete(timer_t timerid)
{
struct timer_obj *timer = (struct timer_obj *) timerid;
if (timer == NULL) {
errno = EINVAL;
return -1;
}
if (timer->status == ACTIVE) {
timer->status = NOT_ACTIVE;
k_timer_stop(&timer->ztimer);
}
k_mem_slab_free(&posix_timer_slab, (void *) &timer);
return 0;
}