1/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
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.
9
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.
14
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 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <stdlib.h>
21#include "pthreadP.h"
22
23
24int
25__pthread_setspecific (pthread_key_t key, const void *value)
26{
27 struct pthread *self;
28 unsigned int idx1st;
29 unsigned int idx2nd;
30 struct pthread_key_data *level2;
31 unsigned int seq;
32
33 self = THREAD_SELF;
34
35 /* Special case access to the first 2nd-level block. This is the
36 usual case. */
37 if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE))
38 {
39 /* Verify the key is sane. */
40 if (KEY_UNUSED ((seq = __pthread_keys[key].seq)))
41 /* Not valid. */
42 return EINVAL;
43
44 level2 = &self->specific_1stblock[key];
45
46 /* Remember that we stored at least one set of data. */
47 if (value != NULL)
48 THREAD_SETMEM (self, specific_used, true);
49 }
50 else
51 {
52 if (key >= PTHREAD_KEYS_MAX
53 || KEY_UNUSED ((seq = __pthread_keys[key].seq)))
54 /* Not valid. */
55 return EINVAL;
56
57 idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
58 idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
59
60 /* This is the second level array. Allocate it if necessary. */
61 level2 = THREAD_GETMEM_NC (self, specific, idx1st);
62 if (level2 == NULL)
63 {
64 if (value == NULL)
65 /* We don't have to do anything. The value would in any case
66 be NULL. We can save the memory allocation. */
67 return 0;
68
69 level2
70 = (struct pthread_key_data *) calloc (PTHREAD_KEY_2NDLEVEL_SIZE,
71 sizeof (*level2));
72 if (level2 == NULL)
73 return ENOMEM;
74
75 THREAD_SETMEM_NC (self, specific, idx1st, level2);
76 }
77
78 /* Pointer to the right array element. */
79 level2 = &level2[idx2nd];
80
81 /* Remember that we stored at least one set of data. */
82 THREAD_SETMEM (self, specific_used, true);
83 }
84
85 /* Store the data and the sequence number so that we can recognize
86 stale data. */
87 level2->seq = seq;
88 level2->data = (void *) value;
89
90 return 0;
91}
92weak_alias (__pthread_setspecific, pthread_setspecific)
93hidden_def (__pthread_setspecific)
94