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/*
* Copyright (C) 2010-2011 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "timer.h"
#include "main.h"
#include "log.h"
#include "conf.h"
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <sys/prctl.h>
static LIST_HEAD(timer_list);
static timer_id_t id_counter;
static inline void timer_lock(void)
{
block_signals();
}
static inline void timer_unlock(void)
{
unblock_signals();
}
static void timespec_add_msec(struct timespec *ts, unsigned int msec)
{
unsigned int seconds, nsec;
seconds = msec / 1000;
msec = msec % 1000;
nsec = msec * 1000000;
ts->tv_nsec += nsec;
while (ts->tv_nsec >= 1000000000) {
ts->tv_sec++;
ts->tv_nsec -= 1000000000;
}
ts->tv_sec += seconds;
}
static int timespec_bigger(const struct timespec *a, const struct timespec *b)
{
if (a->tv_sec > b->tv_sec)
return 1;
if ((a->tv_sec == b->tv_sec) && (a->tv_nsec > b->tv_nsec))
return 1;
return 0;
}
static inline int timespec_after(const struct timespec *a, const struct timespec *b)
{
return timespec_bigger(a, b);
}
void sleeptimer_init(struct sleeptimer *timer,
const char *name,
sleeptimer_callback_t callback)
{
memset(timer, 0, sizeof(*timer));
timer->name = name;
timer->callback = callback;
INIT_LIST_HEAD(&timer->list);
logverbose("timer: %s registered\n", name);
}
void sleeptimer_set_timeout_relative(struct sleeptimer *timer,
unsigned int msecs)
{
int err;
err = clock_gettime(CLOCK_MONOTONIC, &timer->timeout);
if (err) {
logerr("WARNING: clock_gettime() failed: %s\n",
strerror(errno));
return;
}
timespec_add_msec(&timer->timeout, msecs);
}
static void do_sleeptimer_dequeue(struct sleeptimer *timer)
{
list_del_init(&timer->list);
}
void sleeptimer_enqueue(struct sleeptimer *timer)
{
struct sleeptimer *i;
int inserted = 0;
timer_lock();
if (!list_empty(&timer->list))
do_sleeptimer_dequeue(timer);
list_for_each_entry(i, &timer_list, list) {
if (timespec_after(&i->timeout, &timer->timeout)) {
list_add_tail(&timer->list, &i->list);
inserted = 1;
break;
}
}
if (!inserted)
list_add_tail(&timer->list, &timer_list);
timer->id = id_counter++;
timer_unlock();
}
void sleeptimer_dequeue(struct sleeptimer *timer)
{
timer_lock();
do_sleeptimer_dequeue(timer);
timer_unlock();
}
int sleeptimer_system_init(void)
{
#ifdef PR_SET_TIMERSLACK
unsigned long slack;
slack = config_get_int(backend.config, "SYSTEM", "event_slack", 1010);
slack *= 1000000ul; /* To nanoseconds */
if (prctl(PR_SET_TIMERSLACK, slack, 0, 0, 0))
logerr("Failed to set timerslack to %lu ns. Ignoring.\n", slack);
#else
# warning "PR_SET_TIMERSLACK not available. Ignoring."
#endif
return 0;
}
int sleeptimer_wait_next(void)
{
struct timespec timeout;
struct sleeptimer *timer = NULL;
timer_id_t timer_id = 0;
int err;
timer_lock();
if (!list_empty(&timer_list)) {
timer = list_first_entry(&timer_list, struct sleeptimer, list);
timeout = timer->timeout;
timer_id = timer->id;
}
timer_unlock();
if (!timer)
return -ENOENT;
while (1) {
err = clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME,
&timeout, NULL);
if (!err)
break;
if (err == EAGAIN)
continue;
if (err != EINTR) {
logerr("WARNING: clock_nanosleep() failed: %s\n",
strerror(err));
break;
}
}
timer_lock();
list_for_each_entry(timer, &timer_list, list) {
if (timer->id == timer_id) {
do_sleeptimer_dequeue(timer);
timer->callback(timer);
break;
}
}
timer_unlock();
return 0;
}
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