mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Copyright (C) 2002-2013 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 (key)
|
|
pthread_key_t key;
|
|
{
|
|
struct pthread_key_data *data;
|
|
|
|
/* Special case access to the first 2nd-level block. This is the
|
|
usual case. */
|
|
if (__builtin_expect (key < PTHREAD_KEY_2NDLEVEL_SIZE, 1))
|
|
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 (__builtin_expect (seq != __pthread_keys[key].seq, 0))
|
|
result = data->data = NULL;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
strong_alias (__pthread_getspecific, pthread_getspecific)
|
|
hidden_def (__pthread_getspecific)
|