uclibc-ng/libpthread/nptl/pthread_key_create.c

/* Copyright (C) 2002, 2003 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include "pthreadP.h"


/* Internal mutex for __pthread_keys table handling.  */
lll_lock_t __pthread_keys_lock = LLL_LOCK_INITIALIZER;

int
__pthread_key_create (key, destr)
     pthread_key_t *key;
     void (*destr) (void *);
{
  int result = EAGAIN;
  size_t cnt;

  lll_lock (__pthread_keys_lock);

  /* Find a slot in __pthread_kyes which is unused.  */
  for (cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt)
    if (KEY_UNUSED (__pthread_keys[cnt].seq)
	&& KEY_USABLE (__pthread_keys[cnt].seq))
      {
	/* We found an unused slot.  */
	++__pthread_keys[cnt].seq;

	/* Remember the destructor.  */
	__pthread_keys[cnt].destr = destr;

	/* Return the key to the caller.  */
	*key = cnt;

	/* The call succeeded.  */
	result = 0;

	/* We found a key and can stop now.  */
	break;
      }

  lll_unlock (__pthread_keys_lock);

  return result;
}
strong_alias (__pthread_key_create, pthread_key_create)
strong_alias (__pthread_key_create, __pthread_key_create_internal)