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

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@redhat.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; see the file COPYING.LIB.  If

   not, see <http://www.gnu.org/licenses/>.  */

#include <shlib-compat.h>

#include "compat-timer.h"

#include <atomic.h>

#define timer_create_alias __timer_create_new

#include <sysdeps/unix/sysv/linux/timer_create.c>

#undef timer_create

versioned_symbol (librt, __timer_create_new, timer_create, GLIBC_2_3_3);

#if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_3_3)

timer_t __compat_timer_list[OLD_TIMER_MAX] attribute_hidden;

int

__timer_create_old (clockid_t clock_id, struct sigevent *evp, int *timerid)

{

  timer_t newp;

  int res = __timer_create_new (clock_id, evp, &newp);

  if (res == 0)

    {

      int i;

      for (i = 0; i < OLD_TIMER_MAX; ++i)

	if (__compat_timer_list[i] == NULL

	    && ! atomic_compare_and_exchange_bool_acq (&__compat_timer_list[i],

						       newp, NULL))

	  {

	    *timerid = i;

	    break;

	  }

      if (__glibc_unlikely (i == OLD_TIMER_MAX))

	{

	  /* No free slot.  */

	  (void) __timer_delete_new (newp);

	  __set_errno (EINVAL);

	  res = -1;

	}

    }

  return res;

}

compat_symbol (librt, __timer_create_old, timer_create, GLIBC_2_2);

#endif