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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [linuxthreads/] [timer_settime.c] - Blame information for rev 207

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Line No. Rev Author Line
1 207 jeremybenn
/* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Library General Public License as
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   published by the Free Software Foundation; either version 2 of the
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   License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with the GNU C Library; see the file COPYING.LIB.  If not,
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   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include <errno.h>
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#include <pthread.h>
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#include <time.h>
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#include "posix-timer.h"
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/* Set timer TIMERID to VALUE, returning old value in OVLAUE.  */
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int
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timer_settime (timerid, flags, value, ovalue)
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     timer_t timerid;
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     int flags;
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     const struct itimerspec *value;
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     struct itimerspec *ovalue;
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{
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  struct timer_node *timer;
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  struct thread_node *thread = NULL;
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  struct timespec now;
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  int have_now = 0, need_wakeup = 0;
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  int retval = -1;
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  timer = timer_id2ptr (timerid);
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  if (timer == NULL)
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    {
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      __set_errno (EINVAL);
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      goto bail;
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    }
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  if (value->it_interval.tv_nsec < 0
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      || value->it_interval.tv_nsec >= 1000000000
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      || value->it_value.tv_nsec < 0
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      || value->it_value.tv_nsec >= 1000000000)
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    {
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      __set_errno (EINVAL);
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      goto bail;
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    }
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  /* Will need to know current time since this is a relative timer;
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     might as well make the system call outside of the lock now! */
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  if ((flags & TIMER_ABSTIME) == 0)
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    {
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      clock_gettime (timer->clock, &now);
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      have_now = 1;
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    }
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  pthread_mutex_lock (&__timer_mutex);
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  timer_addref (timer);
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  /* One final check of timer validity; this one is possible only
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     until we have the mutex, because it accesses the inuse flag. */
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  if (! timer_valid(timer))
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    {
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      __set_errno (EINVAL);
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      goto unlock_bail;
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    }
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  if (ovalue != NULL)
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    {
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      ovalue->it_interval = timer->value.it_interval;
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      if (timer->armed)
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        {
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          if (! have_now)
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            {
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              pthread_mutex_unlock (&__timer_mutex);
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              clock_gettime (timer->clock, &now);
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              have_now = 1;
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              pthread_mutex_lock (&__timer_mutex);
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              timer_addref (timer);
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            }
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          timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
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        }
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      else
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        {
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          ovalue->it_value.tv_sec = 0;
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          ovalue->it_value.tv_nsec = 0;
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        }
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    }
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  timer->value = *value;
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  list_unlink_ip (&timer->links);
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  timer->armed = 0;
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  thread = timer->thread;
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  /* A value of { 0, 0 } causes the timer to be stopped. */
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  if (value->it_value.tv_sec != 0
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      || __builtin_expect (value->it_value.tv_nsec != 0, 1))
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    {
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      if ((flags & TIMER_ABSTIME) != 0)
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        /* The user specified the expiration time.  */
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        timer->expirytime = value->it_value;
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      else
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        timespec_add (&timer->expirytime, &now, &value->it_value);
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      /* Only need to wake up the thread if timer is inserted
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         at the head of the queue. */
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      if (thread != NULL)
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        need_wakeup = __timer_thread_queue_timer (thread, timer);
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      timer->armed = 1;
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    }
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  retval = 0;
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unlock_bail:
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  timer_delref (timer);
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  pthread_mutex_unlock (&__timer_mutex);
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bail:
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  if (thread != NULL && need_wakeup)
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    __timer_thread_wakeup (thread);
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  return retval;
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}

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