/* 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 <stdlib.h>

#include "pthreadP.h"

void *

__pthread_getspecific (pthread_key_t key)

{

  struct pthread_key_data *data;

  /* Special case access to the first 2nd-level block.  This is the

     usual case.  */

  if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE))

    data = &THREAD_SELF->specific_1stblock[key];

  else

    {

      /* Verify the key is sane.  */

      if (key >= PTHREAD_KEYS_MAX)

	/* Not valid.  */

	return NULL;

      unsigned int idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;

      unsigned int idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;

      /* If the sequence number doesn't match or the key cannot be defined

	 for this thread since the second level array is not allocated

	 return NULL, too.  */

      struct pthread_key_data *level2 = THREAD_GETMEM_NC (THREAD_SELF,

							  specific, idx1st);

      if (level2 == NULL)

	/* Not allocated, therefore no data.  */

	return NULL;

      /* There is data.  */

      data = &level2[idx2nd];

    }

  void *result = data->data;

  if (result != NULL)

    {

      uintptr_t seq = data->seq;

      if (__glibc_unlikely (seq != __pthread_keys[key].seq))

	result = data->data = NULL;

    }

  return result;

}

weak_alias (__pthread_getspecific, pthread_getspecific)

hidden_def (__pthread_getspecific)