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94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* Copyright (C) 2002-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include "pthreadP.h"
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int
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__pthread_setspecific (pthread_key_t key, const void *value)
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{
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struct pthread *self;
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unsigned int idx1st;
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unsigned int idx2nd;
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struct pthread_key_data *level2;
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unsigned int seq;
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self = THREAD_SELF;
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/* Special case access to the first 2nd-level block. This is the
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usual case. */
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if (__glibc_likely (key < PTHREAD_KEY_2NDLEVEL_SIZE))
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{
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/* Verify the key is sane. */
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if (KEY_UNUSED ((seq = __pthread_keys[key].seq)))
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/* Not valid. */
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return EINVAL;
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level2 = &self->specific_1stblock[key];
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/* Remember that we stored at least one set of data. */
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if (value != NULL)
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THREAD_SETMEM (self, specific_used, true);
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}
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else
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{
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if (key >= PTHREAD_KEYS_MAX
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|| KEY_UNUSED ((seq = __pthread_keys[key].seq)))
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/* Not valid. */
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return EINVAL;
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idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
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idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
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/* This is the second level array. Allocate it if necessary. */
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level2 = THREAD_GETMEM_NC (self, specific, idx1st);
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if (level2 == NULL)
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{
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if (value == NULL)
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/* We don't have to do anything. The value would in any case
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be NULL. We can save the memory allocation. */
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return 0;
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level2
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= (struct pthread_key_data *) calloc (PTHREAD_KEY_2NDLEVEL_SIZE,
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sizeof (*level2));
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if (level2 == NULL)
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return ENOMEM;
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THREAD_SETMEM_NC (self, specific, idx1st, level2);
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}
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/* Pointer to the right array element. */
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level2 = &level2[idx2nd];
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/* Remember that we stored at least one set of data. */
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THREAD_SETMEM (self, specific_used, true);
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}
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/* Store the data and the sequence number so that we can recognize
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stale data. */
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level2->seq = seq;
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level2->data = (void *) value;
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return 0;
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}
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weak_alias (__pthread_setspecific, pthread_setspecific)
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hidden_def (__pthread_setspecific)
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