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/* Copyright (C) 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <pthread.h>
#include <time.h>
#include "posix-timer.h"
/* Set timer TIMERID to VALUE, returning old value in OVLAUE. */
int
timer_settime (timerid, flags, value, ovalue)
timer_t timerid;
int flags;
const struct itimerspec *value;
struct itimerspec *ovalue;
{
struct timer_node *timer;
struct thread_node *thread = NULL;
struct timespec now;
int have_now = 0;
int retval = -1;
pthread_mutex_lock (&__timer_mutex);
timer = timer_id2ptr (timerid);
if (timer == NULL)
{
errno = EINVAL;
goto bail;
}
if (value->it_interval.tv_nsec < 0
|| value->it_interval.tv_nsec >= 1000000000
|| value->it_value.tv_nsec < 0
|| value->it_value.tv_nsec >= 1000000000)
{
errno = EINVAL;
goto bail;
}
if (ovalue != NULL)
{
ovalue->it_interval = timer->value.it_interval;
if (timer->armed)
{
clock_gettime (timer->clock, &now);
have_now = 1;
timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
}
else
{
ovalue->it_value.tv_sec = 0;
ovalue->it_value.tv_nsec = 0;
}
}
timer->value = *value;
list_unlink (&timer->links);
timer->armed = 0;
thread = timer->thread;
if (value->it_value.tv_sec != 0
|| __builtin_expect (value->it_value.tv_nsec != 0, 1))
{
if ((flags & TIMER_ABSTIME) != 0)
/* The user specified the expiration time. */
timer->expirytime = value->it_value;
else
{
if (! have_now)
clock_gettime (timer->clock, &now);
timespec_add (&timer->expirytime, &now, &value->it_value);
}
__timer_thread_queue_timer (thread, timer);
timer->armed = 1;
}
retval = 0;
bail:
pthread_mutex_unlock (&__timer_mutex);
/* TODO: optimize this. Only need to wake up the thread if inserting
a new timer at the head of the queue. */
if (thread != NULL)
__timer_thread_wakeup (thread);
return retval;
}
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