glibc/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.c

/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.

   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; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <sys/time.h>


void
___lll_lock (futex, newval)
     int *futex;
     int newval;
{
  do
    {
      int oldval;

      lll_futex_wait (futex, newval);
      lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,-1");
    }
  while (newval != 0);

  *futex = -1;
}
hidden_proto (___lll_lock)


int
lll_unlock_wake_cb (futex)
     int *futex;
{
  int oldval;
  int newval;

  lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1");
  if (oldval < 0)
    lll_futex_wake (futex, 1);
  return 0;
}
hidden_proto (lll_unlock_wake_cb)


int
___lll_timedwait_tid (ptid, abstime)
     int *ptid;
     const struct timespec *abstime;
{
  int tid;

  if (abstime == NULL || abstime->tv_nsec >= 1000000000)
    return EINVAL;

  /* Repeat until thread terminated.  */
  while ((tid = *ptid) != 0)
    {
      /* Get current time.  */
      struct timeval tv;
      gettimeofday (&tv, NULL);

      /* Determine relative timeout.  */
      struct timespec rt;
      rt.tv_sec = abstime->tv_sec - tv.tv_sec;
      rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
      if (rt.tv_nsec < 0)
	{
	  rt.tv_nsec += 1000000000;
	  rt.tv_sec--;
	}
      /* Already timed out?  */
      if (rt.tv_sec < 0)
	return ETIMEDOUT;

      /* Wait until thread terminates.  */
      int err = lll_futex_timed_wait (ptid, tid, &rt);

      /* Woken due to timeout?  */
      if (err == -ETIMEDOUT)
	/* Yes.  */
	return ETIMEDOUT;
    }

  return 0;
}

hidden_proto (___lll_timedwait_tid)