/* low level locking for pthread library.  Generic futex-using 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>

#include <atomic.h>

void

__lll_lock_wait_private (int *futex)

{

  if (*futex == 2)

    lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2.  */

  while (atomic_exchange_acq (futex, 2) != 0)

    lll_futex_wait (futex, 2, LLL_PRIVATE); /* Wait if *futex == 2.  */

}

/* This function doesn't get included in libc.  */

#if IS_IN (libpthread)

void

__lll_lock_wait (int *futex, int private)

{

  if (*futex == 2)

    lll_futex_wait (futex, 2, private); /* Wait if *futex == 2.  */

  while (atomic_exchange_acq (futex, 2) != 0)

    lll_futex_wait (futex, 2, private); /* Wait if *futex == 2.  */

}

#endif