230 lines
7.1 KiB
C
230 lines
7.1 KiB
C
/* $NetBSD: pthread_alarms.c,v 1.13 2006/03/19 23:01:03 christos Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: pthread_alarms.c,v 1.13 2006/03/19 23:01:03 christos Exp $");
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#include <err.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include "pthread.h"
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#include "pthread_int.h"
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timer_t pthread_alarmtimer;
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PTQ_HEAD(, pt_alarm_t) pthread_alarmqueue = PTQ_HEAD_INITIALIZER;
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pthread_spin_t pthread_alarmqlock = __SIMPLELOCK_UNLOCKED;
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#ifdef PTHREAD_ALARM_DEBUG
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#define SDPRINTF(x) DPRINTF(x)
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#else
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#define SDPRINTF(x)
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#endif
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void
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pthread__alarm_init(void)
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{
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struct sigevent ev;
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int retval;
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ev.sigev_notify = SIGEV_SA;
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ev.sigev_signo = 0;
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ev.sigev_value.sival_int = (int)PT_ALARMTIMER_MAGIC;
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retval = timer_create(CLOCK_REALTIME, &ev, &pthread_alarmtimer);
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pthread__assert(retval == 0);
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}
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void
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pthread__alarm_add(pthread_t self, struct pt_alarm_t *alarm,
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const struct timespec *ts, void (*func)(void *), void *arg)
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{
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struct pt_alarm_t *iterator, *prev;
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struct itimerspec it;
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int retval;
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pthread_lockinit(&alarm->pta_lock);
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alarm->pta_time = ts;
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alarm->pta_func = func;
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alarm->pta_arg = arg;
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alarm->pta_fired = 0;
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SDPRINTF(("(alarm_add %p) alarm %p for %d.%06ld\n",
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self, alarm, ts->tv_sec, ts->tv_nsec/1000));
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prev = NULL;
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pthread_spinlock(self, &pthread_alarmqlock);
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PTQ_FOREACH(iterator, &pthread_alarmqueue, pta_next) {
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if (timespeccmp(ts, iterator->pta_time, <))
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break;
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prev = iterator;
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}
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if (iterator == PTQ_FIRST(&pthread_alarmqueue)) {
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PTQ_INSERT_HEAD(&pthread_alarmqueue, alarm, pta_next);
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timespecclear(&it.it_interval);
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/*
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* A zero-valued timespec will disarm the timer, but is
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* a legitimate value for the _timedwait functions to
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* pass in. Correct for this here and in other timer-resetting
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* code by setting it_value to a small value that is
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* safely in the past.
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*/
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if (timespecisset(ts)) {
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it.it_value = *ts;
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} else {
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it.it_value.tv_sec = 1;
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it.it_value.tv_nsec = 0;
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}
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SDPRINTF(("(add %p) resetting alarm timer to %d.%06d\n",
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self, it.it_value.tv_sec, it.it_value.tv_nsec/1000));
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retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME,
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&it, NULL);
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pthread__assert(retval == 0);
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} else if (prev != NULL) {
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PTQ_INSERT_AFTER(&pthread_alarmqueue, prev, alarm, pta_next);
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}
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pthread_spinunlock(self, &pthread_alarmqlock);
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}
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void
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pthread__alarm_del(pthread_t self, struct pt_alarm_t *alarm)
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{
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struct pt_alarm_t *next;
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struct itimerspec it;
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int retval;
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next = NULL;
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pthread_spinlock(self, &pthread_alarmqlock);
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pthread_spinlock(self, &alarm->pta_lock);
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SDPRINTF(("(del %p) alarm %p\n", self, alarm));
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if (alarm->pta_fired == 0) {
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if (alarm == PTQ_FIRST(&pthread_alarmqueue)) {
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next = PTQ_NEXT(alarm, pta_next);
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timespecclear(&it.it_interval);
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if (next != NULL)
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/* See comment in pthread__alarm_add() */
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if (timespecisset(next->pta_time)) {
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it.it_value = *next->pta_time;
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} else {
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it.it_value.tv_sec = 1;
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it.it_value.tv_nsec = 0;
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}
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else
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timespecclear(&it.it_value);
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SDPRINTF(("(del %p) resetting alarm timer to %d.%06d\n",
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self, it.it_value.tv_sec, it.it_value.tv_nsec/1000));
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retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME, &it,
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NULL);
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pthread__assert(retval == 0);
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}
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PTQ_REMOVE(&pthread_alarmqueue, alarm, pta_next);
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}
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pthread_spinunlock(self, &alarm->pta_lock);
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pthread_spinunlock(self, &pthread_alarmqlock);
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}
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int
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pthread__alarm_fired(struct pt_alarm_t *alarm)
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{
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return alarm->pta_fired;
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}
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void
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/*ARGSUSED*/
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pthread__alarm_process(pthread_t self, void *arg)
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{
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struct timespec ts;
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struct itimerspec it;
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struct pt_alarm_t *iterator, *next;
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PTQ_HEAD(, pt_alarm_t) runq;
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int retval;
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clock_gettime(CLOCK_REALTIME, &ts);
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SDPRINTF(("(pro %p) alarm time %d.%06ld\n",
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self, ts.tv_sec, ts.tv_nsec / 1000));
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PTQ_INIT(&runq);
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pthread_spinlock(self, &pthread_alarmqlock);
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/* 1. Collect a list of all alarms whose time has passed. */
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for (iterator = next = PTQ_FIRST(&pthread_alarmqueue);
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iterator;
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iterator = next) {
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if (timespeccmp(&ts, iterator->pta_time, <=))
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break;
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pthread_spinlock(self, &iterator->pta_lock);
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next = PTQ_NEXT(iterator, pta_next);
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PTQ_REMOVE(&pthread_alarmqueue, iterator, pta_next);
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PTQ_INSERT_TAIL(&runq, iterator, pta_next);
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SDPRINTF(("(pro %p) collect alarm %p\n", self, iterator));
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}
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/* 2. Reset the timer for the next element in the queue. */
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if (next) {
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timespecclear(&it.it_interval);
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/* See comment in pthread__alarm_add() */
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if (timespecisset(next->pta_time)) {
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it.it_value = *next->pta_time;
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} else {
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it.it_value.tv_sec = 1;
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it.it_value.tv_nsec = 0;
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}
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SDPRINTF(("(pro %p) resetting alarm timer to %d.%09d\n", self,
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it.it_value.tv_sec, it.it_value.tv_nsec));
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retval = timer_settime(pthread_alarmtimer, TIMER_ABSTIME, &it, NULL);
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pthread__assert(retval == 0);
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}
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pthread_spinunlock(self, &pthread_alarmqlock);
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/* 3. Call the functions for all passed alarms. */
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for (iterator = next = PTQ_FIRST(&runq);
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iterator;
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iterator = next) {
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SDPRINTF(("(pro %p) calling function for alarm %p\n", self, iterator));
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(*iterator->pta_func)(iterator->pta_arg);
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iterator->pta_fired = 1;
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next = PTQ_NEXT(iterator, pta_next);
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pthread_spinunlock(self, &iterator->pta_lock);
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}
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SDPRINTF(("(pro %p) done\n", self, iterator));
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}
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