BZ#11261 fixed by previous commit.
[glibc.git] / nptl / pthread_setspecific.c
blobb05429903a8742e8b24d05e9c39ef88964c69c67
1 /* Copyright (C) 2002-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #include <errno.h>
20 #include <stdlib.h>
21 #include "pthreadP.h"
24 int
25 __pthread_setspecific (key, value)
26 pthread_key_t key;
27 const void *value;
29 struct pthread *self;
30 unsigned int idx1st;
31 unsigned int idx2nd;
32 struct pthread_key_data *level2;
33 unsigned int seq;
35 self = THREAD_SELF;
37 /* Special case access to the first 2nd-level block. This is the
38 usual case. */
39 if (__builtin_expect (key < PTHREAD_KEY_2NDLEVEL_SIZE, 1))
41 /* Verify the key is sane. */
42 if (KEY_UNUSED ((seq = __pthread_keys[key].seq)))
43 /* Not valid. */
44 return EINVAL;
46 level2 = &self->specific_1stblock[key];
48 /* Remember that we stored at least one set of data. */
49 if (value != NULL)
50 THREAD_SETMEM (self, specific_used, true);
52 else
54 if (key >= PTHREAD_KEYS_MAX
55 || KEY_UNUSED ((seq = __pthread_keys[key].seq)))
56 /* Not valid. */
57 return EINVAL;
59 idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
60 idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
62 /* This is the second level array. Allocate it if necessary. */
63 level2 = THREAD_GETMEM_NC (self, specific, idx1st);
64 if (level2 == NULL)
66 if (value == NULL)
67 /* We don't have to do anything. The value would in any case
68 be NULL. We can save the memory allocation. */
69 return 0;
71 level2
72 = (struct pthread_key_data *) calloc (PTHREAD_KEY_2NDLEVEL_SIZE,
73 sizeof (*level2));
74 if (level2 == NULL)
75 return ENOMEM;
77 THREAD_SETMEM_NC (self, specific, idx1st, level2);
80 /* Pointer to the right array element. */
81 level2 = &level2[idx2nd];
83 /* Remember that we stored at least one set of data. */
84 THREAD_SETMEM (self, specific_used, true);
87 /* Store the data and the sequence number so that we can recognize
88 stale data. */
89 level2->seq = seq;
90 level2->data = (void *) value;
92 return 0;
94 strong_alias (__pthread_setspecific, pthread_setspecific)
95 hidden_def (__pthread_setspecific)