8fa85b4a65
clock_gettime(CLOCK_REALTIME), except the latter may have more preicison some day. So, use that.
230 lines
7.1 KiB
C
230 lines
7.1 KiB
C
/* $NetBSD: pthread_alarms.c,v 1.12 2005/01/06 17:33:36 mycroft Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Nathan J. Williams.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__RCSID("$NetBSD: pthread_alarms.c,v 1.12 2005/01/06 17:33:36 mycroft Exp $");
|
|
|
|
#include <err.h>
|
|
#include <sys/time.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "pthread.h"
|
|
#include "pthread_int.h"
|
|
|
|
timer_t pthread_alarmtimer;
|
|
PTQ_HEAD(, pt_alarm_t) pthread_alarmqueue = PTQ_HEAD_INITIALIZER;
|
|
pthread_spin_t pthread_alarmqlock = __SIMPLELOCK_UNLOCKED;
|
|
|
|
#ifdef PTHREAD_ALARM_DEBUG
|
|
#define SDPRINTF(x) DPRINTF(x)
|
|
#else
|
|
#define SDPRINTF(x)
|
|
#endif
|
|
|
|
void
|
|
pthread__alarm_init(void)
|
|
{
|
|
struct sigevent ev;
|
|
int retval;
|
|
|
|
ev.sigev_notify = SIGEV_SA;
|
|
ev.sigev_signo = 0;
|
|
ev.sigev_value.sival_int = (int)PT_ALARMTIMER_MAGIC;
|
|
retval = timer_create(CLOCK_REALTIME, &ev, &pthread_alarmtimer);
|
|
pthread__assert(retval == 0);
|
|
|
|
}
|
|
|
|
void
|
|
pthread__alarm_add(pthread_t self, struct pt_alarm_t *alarm,
|
|
const struct timespec *ts, void (*func)(void *), void *arg)
|
|
{
|
|
struct pt_alarm_t *iterator, *prev;
|
|
struct itimerspec it;
|
|
int retval;
|
|
|
|
pthread_lockinit(&alarm->pta_lock);
|
|
alarm->pta_time = ts;
|
|
alarm->pta_func = func;
|
|
alarm->pta_arg = arg;
|
|
alarm->pta_fired = 0;
|
|
|
|
SDPRINTF(("(alarm_add %p) alarm %p for %d.%06ld\n",
|
|
self, alarm, ts->tv_sec, ts->tv_nsec/1000));
|
|
prev = NULL;
|
|
pthread_spinlock(self, &pthread_alarmqlock);
|
|
PTQ_FOREACH(iterator, &pthread_alarmqueue, pta_next) {
|
|
if (timespeccmp(ts, iterator->pta_time, <))
|
|
break;
|
|
prev = iterator;
|
|
}
|
|
|
|
if (iterator == PTQ_FIRST(&pthread_alarmqueue)) {
|
|
PTQ_INSERT_HEAD(&pthread_alarmqueue, alarm, pta_next);
|
|
timespecclear(&it.it_interval);
|
|
/*
|
|
* A zero-valued timespec will disarm the timer, but is
|
|
* a legitimate value for the _timedwait functions to
|
|
* pass in. Correct for this here and in other timer-resetting
|
|
* code by setting it_value to a small value that is
|
|
* safely in the past.
|
|
*/
|
|
if (timespecisset(ts)) {
|
|
it.it_value = *ts;
|
|
} else {
|
|
it.it_value.tv_sec = 1;
|
|
it.it_value.tv_nsec = 0;
|
|
}
|
|
SDPRINTF(("(add %p) resetting alarm timer to %d.%06d\n",
|
|
self, it.it_value.tv_sec, it.it_value.tv_nsec/1000));
|
|
retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME,
|
|
&it, NULL);
|
|
pthread__assert(retval == 0);
|
|
|
|
} else {
|
|
PTQ_INSERT_AFTER(&pthread_alarmqueue, prev, alarm, pta_next);
|
|
}
|
|
pthread_spinunlock(self, &pthread_alarmqlock);
|
|
|
|
}
|
|
|
|
void
|
|
pthread__alarm_del(pthread_t self, struct pt_alarm_t *alarm)
|
|
{
|
|
struct pt_alarm_t *next;
|
|
struct itimerspec it;
|
|
int retval;
|
|
|
|
next = NULL;
|
|
pthread_spinlock(self, &pthread_alarmqlock);
|
|
pthread_spinlock(self, &alarm->pta_lock);
|
|
SDPRINTF(("(del %p) alarm %p\n", self, alarm));
|
|
if (alarm->pta_fired == 0) {
|
|
if (alarm == PTQ_FIRST(&pthread_alarmqueue)) {
|
|
next = PTQ_NEXT(alarm, pta_next);
|
|
timespecclear(&it.it_interval);
|
|
if (next != NULL)
|
|
/* See comment in pthread__alarm_add() */
|
|
if (timespecisset(next->pta_time)) {
|
|
it.it_value = *next->pta_time;
|
|
} else {
|
|
it.it_value.tv_sec = 1;
|
|
it.it_value.tv_nsec = 0;
|
|
}
|
|
else
|
|
timespecclear(&it.it_value);
|
|
SDPRINTF(("(del %p) resetting alarm timer to %d.%06d\n",
|
|
self, it.it_value.tv_sec, it.it_value.tv_nsec/1000));
|
|
retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME, &it,
|
|
NULL);
|
|
pthread__assert(retval == 0);
|
|
}
|
|
PTQ_REMOVE(&pthread_alarmqueue, alarm, pta_next);
|
|
}
|
|
pthread_spinunlock(self, &alarm->pta_lock);
|
|
pthread_spinunlock(self, &pthread_alarmqlock);
|
|
}
|
|
|
|
int
|
|
pthread__alarm_fired(struct pt_alarm_t *alarm)
|
|
{
|
|
|
|
return alarm->pta_fired;
|
|
}
|
|
|
|
void
|
|
/*ARGSUSED*/
|
|
pthread__alarm_process(pthread_t self, void *arg)
|
|
{
|
|
struct timespec ts;
|
|
struct itimerspec it;
|
|
struct pt_alarm_t *iterator, *next;
|
|
PTQ_HEAD(, pt_alarm_t) runq;
|
|
int retval;
|
|
|
|
clock_gettime(CLOCK_REALTIME, &ts);
|
|
|
|
SDPRINTF(("(pro %p) alarm time %d.%06ld\n",
|
|
self, ts.tv_sec, ts.tv_nsec / 1000));
|
|
|
|
PTQ_INIT(&runq);
|
|
pthread_spinlock(self, &pthread_alarmqlock);
|
|
|
|
/* 1. Collect a list of all alarms whose time has passed. */
|
|
for (iterator = next = PTQ_FIRST(&pthread_alarmqueue);
|
|
iterator;
|
|
iterator = next) {
|
|
if (timespeccmp(&ts, iterator->pta_time, <=))
|
|
break;
|
|
pthread_spinlock(self, &iterator->pta_lock);
|
|
next = PTQ_NEXT(iterator, pta_next);
|
|
PTQ_REMOVE(&pthread_alarmqueue, iterator, pta_next);
|
|
PTQ_INSERT_TAIL(&runq, iterator, pta_next);
|
|
SDPRINTF(("(pro %p) collect alarm %p\n", self, iterator));
|
|
}
|
|
|
|
/* 2. Reset the timer for the next element in the queue. */
|
|
if (next) {
|
|
timespecclear(&it.it_interval);
|
|
/* See comment in pthread__alarm_add() */
|
|
if (timespecisset(next->pta_time)) {
|
|
it.it_value = *next->pta_time;
|
|
} else {
|
|
it.it_value.tv_sec = 1;
|
|
it.it_value.tv_nsec = 0;
|
|
}
|
|
SDPRINTF(("(pro %p) resetting alarm timer to %d.%09d\n", self,
|
|
it.it_value.tv_sec, it.it_value.tv_nsec));
|
|
retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME, &it, NULL);
|
|
pthread__assert(retval == 0);
|
|
}
|
|
pthread_spinunlock(self, &pthread_alarmqlock);
|
|
|
|
/* 3. Call the functions for all passed alarms. */
|
|
for (iterator = next = PTQ_FIRST(&runq);
|
|
iterator;
|
|
iterator = next) {
|
|
SDPRINTF(("(pro %p) calling function for alarm %p\n", self, iterator));
|
|
(*iterator->pta_func)(iterator->pta_arg);
|
|
iterator->pta_fired = 1;
|
|
next = PTQ_NEXT(iterator, pta_next);
|
|
pthread_spinunlock(self, &iterator->pta_lock);
|
|
}
|
|
SDPRINTF(("(pro %p) done\n", self, iterator));
|
|
}
|