mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/* pthread_key_create. Hurd version.
|
|
Copyright (C) 2002-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
#include <assert.h>
|
|
|
|
#include <pt-internal.h>
|
|
#include <pthreadP.h>
|
|
|
|
pthread_mutex_t __pthread_key_lock;
|
|
pthread_once_t __pthread_key_once = PTHREAD_ONCE_INIT;
|
|
|
|
void (**__pthread_key_destructors) (void *arg);
|
|
int __pthread_key_size;
|
|
int __pthread_key_count;
|
|
int __pthread_key_invalid_count;
|
|
|
|
int
|
|
__pthread_key_create (pthread_key_t *key, void (*destructor) (void *))
|
|
{
|
|
/* Where to look for the next key slot. */
|
|
static int index;
|
|
|
|
__pthread_key_lock_ready ();
|
|
|
|
__pthread_mutex_lock (&__pthread_key_lock);
|
|
|
|
do_search:
|
|
/* Use the search hint and try to find a free slot. */
|
|
for (; index < __pthread_key_count
|
|
&& __pthread_key_destructors[index] != PTHREAD_KEY_INVALID; index++)
|
|
;
|
|
|
|
/* See if we actually found a free element. */
|
|
if (index < __pthread_key_count)
|
|
{
|
|
assert (__pthread_key_destructors[index] == PTHREAD_KEY_INVALID);
|
|
assert (__pthread_key_invalid_count > 0);
|
|
|
|
__pthread_key_invalid_count--;
|
|
__pthread_key_destructors[index] = destructor;
|
|
*key = index++;
|
|
|
|
__pthread_mutex_unlock (&__pthread_key_lock);
|
|
return 0;
|
|
}
|
|
|
|
assert (index == __pthread_key_count);
|
|
|
|
/* No space at the end. */
|
|
if (__pthread_key_size == __pthread_key_count)
|
|
{
|
|
/* See if it is worth looking for a free element. */
|
|
if (__pthread_key_invalid_count > 4
|
|
&& __pthread_key_invalid_count > __pthread_key_size / 8)
|
|
{
|
|
index = 0;
|
|
goto do_search;
|
|
}
|
|
|
|
|
|
/* Resize the array. */
|
|
{
|
|
void *t;
|
|
int newsize;
|
|
|
|
if (__pthread_key_size == 0)
|
|
newsize = 8;
|
|
else
|
|
newsize = __pthread_key_size * 2;
|
|
|
|
t = realloc (__pthread_key_destructors,
|
|
newsize * sizeof (*__pthread_key_destructors));
|
|
if (t == NULL)
|
|
{
|
|
__pthread_mutex_unlock (&__pthread_key_lock);
|
|
return ENOMEM;
|
|
}
|
|
|
|
__pthread_key_size = newsize;
|
|
__pthread_key_destructors = t;
|
|
}
|
|
}
|
|
|
|
__pthread_key_destructors[index] = destructor;
|
|
*key = index;
|
|
|
|
index++;
|
|
__pthread_key_count++;
|
|
|
|
__pthread_mutex_unlock (&__pthread_key_lock);
|
|
return 0;
|
|
}
|
|
weak_alias (__pthread_key_create, pthread_key_create)
|
|
hidden_def (__pthread_key_create)
|