/* Copyright (C) 2002-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.

   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 <semaphore.h>

#include <shlib-compat.h>

#include "semaphoreP.h"

#include <kernel-features.h>

#include <futex-internal.h>

int

__new_sem_init (sem_t *sem, int pshared, unsigned int value)

{

  ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem);

  /* Parameter sanity check.  */

  if (__glibc_unlikely (value > SEM_VALUE_MAX))

    {

      __set_errno (EINVAL);

      return -1;

    }

  pshared = pshared != 0 ? PTHREAD_PROCESS_SHARED : PTHREAD_PROCESS_PRIVATE;

  int err = futex_supports_pshared (pshared);

  if (err != 0)

    {

      __set_errno (err);

      return -1;

    }

  /* Map to the internal type.  */

  struct new_sem *isem = (struct new_sem *) sem;

  /* Use the values the caller provided.  */

#if __HAVE_64B_ATOMICS

  isem->data = value;

#else

  isem->value = value << SEM_VALUE_SHIFT;

  /* pad is used as a mutex on pre-v9 sparc and ignored otherwise.  */

  isem->pad = 0;

  isem->nwaiters = 0;

#endif

  isem->private = (pshared == PTHREAD_PROCESS_PRIVATE

		   ? FUTEX_PRIVATE : FUTEX_SHARED);

  return 0;

}

versioned_symbol (libpthread, __new_sem_init, sem_init, GLIBC_2_1);

#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)

int

attribute_compat_text_section

__old_sem_init (sem_t *sem, int pshared, unsigned int value)

{

  ASSERT_PTHREAD_INTERNAL_SIZE (sem_t, struct new_sem);

  /* Parameter sanity check.  */

  if (__glibc_unlikely (value > SEM_VALUE_MAX))

    {

      __set_errno (EINVAL);

      return -1;

    }

  /* Map to the internal type.  */

  struct old_sem *isem = (struct old_sem *) sem;

  /* Use the value the user provided.  */

  isem->value = value;

  /* We cannot store the PSHARED attribute.  So we always use the

     operations needed for shared semaphores.  */

  return 0;

}

compat_symbol (libpthread, __old_sem_init, sem_init, GLIBC_2_0);

#endif