summary refs log tree commit diff
path: root/nptl/pthread_key_create.c
blob: 7a073f2d80bddb90501e98904e0f6bedfebf458d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
/* Copyright (C) 2002 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_kyes table handling.  */
lll_lock_t __pthread_keys_lock = LLL_LOCK_INITIALIZER;


/* For debugging purposes put the maximum number of keys in a variable.  */
const int __linuxthreads_pthread_keys_max = PTHREAD_KEYS_MAX;
const int __linuxthreads_pthread_key_2ndlevel_size = PTHREAD_KEY_2NDLEVEL_SIZE;


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)