/* 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 "pthreadP.h"

#include <atomic.h>

int

__pthread_key_delete (pthread_key_t key)

{

  int result = EINVAL;

  if (__glibc_likely (key < PTHREAD_KEYS_MAX))

    {

      unsigned int seq = __pthread_keys[key].seq;

      if (__builtin_expect (! KEY_UNUSED (seq), 1)

	  && ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[key].seq,

						     seq + 1, seq))

	/* We deleted a valid key.  */

	result = 0;

    }

  return result;

}

weak_alias (__pthread_key_delete, pthread_key_delete)