mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 17:11:06 +00:00
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/* Copyright (C) 2000-2014 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 Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#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, need_wakeup = 0;
|
|
int retval = -1;
|
|
|
|
timer = timer_id2ptr (timerid);
|
|
if (timer == NULL)
|
|
{
|
|
__set_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)
|
|
{
|
|
__set_errno (EINVAL);
|
|
goto bail;
|
|
}
|
|
|
|
/* Will need to know current time since this is a relative timer;
|
|
might as well make the system call outside of the lock now! */
|
|
|
|
if ((flags & TIMER_ABSTIME) == 0)
|
|
{
|
|
clock_gettime (timer->clock, &now);
|
|
have_now = 1;
|
|
}
|
|
|
|
pthread_mutex_lock (&__timer_mutex);
|
|
timer_addref (timer);
|
|
|
|
/* One final check of timer validity; this one is possible only
|
|
until we have the mutex, because it accesses the inuse flag. */
|
|
|
|
if (! timer_valid(timer))
|
|
{
|
|
__set_errno (EINVAL);
|
|
goto unlock_bail;
|
|
}
|
|
|
|
if (ovalue != NULL)
|
|
{
|
|
ovalue->it_interval = timer->value.it_interval;
|
|
|
|
if (timer->armed)
|
|
{
|
|
if (! have_now)
|
|
{
|
|
pthread_mutex_unlock (&__timer_mutex);
|
|
clock_gettime (timer->clock, &now);
|
|
have_now = 1;
|
|
pthread_mutex_lock (&__timer_mutex);
|
|
timer_addref (timer);
|
|
}
|
|
|
|
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_ip (&timer->links);
|
|
timer->armed = 0;
|
|
|
|
thread = timer->thread;
|
|
|
|
/* A value of { 0, 0 } causes the timer to be stopped. */
|
|
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
|
|
timespec_add (&timer->expirytime, &now, &value->it_value);
|
|
|
|
/* Only need to wake up the thread if timer is inserted
|
|
at the head of the queue. */
|
|
if (thread != NULL)
|
|
need_wakeup = __timer_thread_queue_timer (thread, timer);
|
|
timer->armed = 1;
|
|
}
|
|
|
|
retval = 0;
|
|
|
|
unlock_bail:
|
|
timer_delref (timer);
|
|
pthread_mutex_unlock (&__timer_mutex);
|
|
|
|
bail:
|
|
if (thread != NULL && need_wakeup)
|
|
__timer_thread_wakeup (thread);
|
|
|
|
return retval;
|
|
}
|