/* low level locking for pthread library.  SPARC version.

   Copyright (C) 2003-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Paul Mackerras <paulus@au.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, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <sysdep.h>

#include <lowlevellock.h>

#include <sys/time.h>

void

__lll_lock_wait_private (int *futex)

{

  do

    {

      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);

      if (oldval != 0)

	lll_futex_wait (futex, 2, LLL_PRIVATE);

    }

  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);

}

/* These functions don't get included in libc.so  */

#if IS_IN (libpthread)

void

__lll_lock_wait (int *futex, int private)

{

  do

    {

      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);

      if (oldval != 0)

	lll_futex_wait (futex, 2, private);

    }

  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);

}

int

__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)

{

  /* Reject invalid timeouts.  */

  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)

    return EINVAL;

  do

    {

      struct timeval tv;

      struct timespec rt;

      /* Get the current time.  */

      (void) __gettimeofday (&tv, NULL);

      /* Compute relative timeout.  */

      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.  */

      int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1);

      if (oldval != 0)

	lll_futex_timed_wait (futex, 2, &rt, private);

    }

  while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0);

  return 0;

}

int

__lll_timedwait_tid (int *tidp, const struct timespec *abstime)

{

  int tid;

  if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)

    return EINVAL;

  /* Repeat until thread terminated.  */

  while ((tid = *tidp) != 0)

    {

      struct timeval tv;

      struct timespec rt;

      /* Get the current time.  */

      (void) __gettimeofday (&tv, NULL);

      /* Compute relative timeout.  */

      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.  The kernel so far does not use

	 the private futex operations for this.  */

      if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)

	return ETIMEDOUT;

    }

  return 0;

}

#endif