52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* Copyright (C) 2002-2017 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 <errno.h>
|
|
#include "pthreadP.h"
|
|
#include <atomic.h>
|
|
|
|
|
|
int
|
|
__pthread_key_create (pthread_key_t *key, void (*destr) (void *))
|
|
{
|
|
/* Find a slot in __pthread_keys which is unused. */
|
|
for (size_t cnt = 0; cnt < PTHREAD_KEYS_MAX; ++cnt)
|
|
{
|
|
uintptr_t seq = __pthread_keys[cnt].seq;
|
|
|
|
if (KEY_UNUSED (seq) && KEY_USABLE (seq)
|
|
/* We found an unused slot. Try to allocate it. */
|
|
&& ! atomic_compare_and_exchange_bool_acq (&__pthread_keys[cnt].seq,
|
|
seq + 1, seq))
|
|
{
|
|
/* Remember the destructor. */
|
|
__pthread_keys[cnt].destr = destr;
|
|
|
|
/* Return the key to the caller. */
|
|
*key = cnt;
|
|
|
|
/* The call succeeded. */
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return EAGAIN;
|
|
}
|
|
weak_alias (__pthread_key_create, pthread_key_create)
|
|
hidden_def (__pthread_key_create)
|