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/* pthread_key_create. Hurd version.
Copyright (C) 2002 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <pthread.h>
#include <stdlib.h>
#include <assert.h>
#include <pt-internal.h>
pthread_mutex_t __pthread_key_lock;
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)
{
__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;
}
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