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/* $OpenBSD: kern_sensors.c,v 1.5 2005/11/21 13:47:52 dlg Exp $ */
/*
* Copyright (c) 2005 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/kthread.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/sensors.h>
int _sensors_count = 0;
struct sensors_head _sensors_list = SLIST_HEAD_INITIALIZER(&_sensors_list);
struct sensor_task {
void *arg;
void (*func)(void *);
int period;
time_t nextrun;
volatile int running;
TAILQ_ENTRY(sensor_task) entry;
};
void sensor_task_create(void *);
void sensor_task_thread(void *);
void sensor_task_schedule(struct sensor_task *);
TAILQ_HEAD(, sensor_task) tasklist = TAILQ_HEAD_INITIALIZER(tasklist);
int
sensor_task_register(void *arg, void (*func)(void *), int period)
{
struct sensor_task *st;
st = malloc(sizeof(struct sensor_task), M_DEVBUF, M_NOWAIT);
if (st == NULL)
return (1);
st->arg = arg;
st->func = func;
st->period = period;
st->running = 1;
if (TAILQ_EMPTY(&tasklist))
kthread_create_deferred(sensor_task_create, NULL);
sensor_task_schedule(st);
wakeup(&tasklist);
return (0);
}
void
sensor_task_unregister(void *arg)
{
struct sensor_task *st;
TAILQ_FOREACH(st, &tasklist, entry) {
if (st->arg == arg)
st->running = 0;
}
}
void
sensor_task_create(void *arg)
{
if (kthread_create(sensor_task_thread, NULL, NULL, "sensors") != 0)
panic("sensors kthread");
}
void
sensor_task_thread(void *arg)
{
struct sensor_task *st, *nst;
time_t now;
while (!TAILQ_EMPTY(&tasklist)) {
while ((nst = TAILQ_FIRST(&tasklist))->nextrun >
(now = time_uptime))
tsleep(&tasklist, PWAIT, "timeout",
(nst->nextrun - now) * hz);
while ((st = nst) != NULL) {
nst = TAILQ_NEXT(st, entry);
if (st->nextrun > now)
break;
/* take it out while we work on it */
TAILQ_REMOVE(&tasklist, st, entry);
if (!st->running) {
free(st, M_DEVBUF);
continue;
}
/* run the task */
st->func(st->arg);
/* stick it back in the tasklist */
sensor_task_schedule(st);
}
}
kthread_exit(0);
}
void
sensor_task_schedule(struct sensor_task *st)
{
struct sensor_task *cst;
st->nextrun = time_uptime + st->period;
TAILQ_FOREACH(cst, &tasklist, entry) {
if (cst->nextrun > st->nextrun) {
TAILQ_INSERT_BEFORE(cst, st, entry);
return;
}
}
/* must be an empty list, or at the end of the list */
TAILQ_INSERT_TAIL(&tasklist, st, entry);
}
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