/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "synonyms.h"

#include <stdlib.h>

#include <errno.h>

#include "mtlib.h"

#include "libc.h"

#include "tsd.h"

typedef void (*pfrv_t)(void *);

typedef struct {

	void	*buf;

	size_t	size;

	pfrv_t	destructor;

} tsdent_t;

static void

_free_tsdbuf(void *ptr)

{

	tsdent_t *loc = ptr;

	pfrv_t destructor;

	void *p;

	int i;

	if (loc != NULL) {

		for (i = 0; i < _T_NUM_ENTRIES; i++) {

			if ((p = loc[i].buf) != NULL) {

				destructor = loc[i].destructor;

				if (destructor != NULL)

					destructor(p);

				lfree(p, loc[i].size);

			}

		}

		lfree(loc, _T_NUM_ENTRIES * sizeof (tsdent_t));

	}

}

void *

tsdalloc(__tsd_item_t n, size_t size, pfrv_t destructor)

{

	static int		once_key = 0;

	static mutex_t		key_lock = DEFAULTMUTEX;

	static thread_key_t	key;

	tsdent_t		*loc;

	void			*p;

	int			error;

	if ((uint_t)n >= _T_NUM_ENTRIES) {

		errno = ENOTSUP;

		return (NULL);

	}

	if (once_key == 0) {

		lmutex_lock(&key_lock);

		if (once_key == 0) {

			if ((error = _thr_keycreate(&key, _free_tsdbuf)) != 0) {

				lmutex_unlock(&key_lock);

				errno = error;

				return (NULL);

			}

			once_key = 1;

		}

		lmutex_unlock(&key_lock);

	}

	if ((loc = _pthread_getspecific(key)) != NULL) {

		if ((p = loc[n].buf) != NULL)

			return (p);

	} else {

		/* allocate our array of pointers */

		loc = lmalloc(_T_NUM_ENTRIES * sizeof (tsdent_t));

		if (loc == NULL)

			return (NULL);

		if ((error = _thr_setspecific(key, loc)) != 0) {

			lfree(loc, _T_NUM_ENTRIES * sizeof (tsdent_t));

			errno = error;

			return (NULL);

		}

	}

	/* allocate item n */

	loc[n].buf = p = lmalloc(size);

	loc[n].size = size;

	loc[n].destructor = destructor;

	return (p);

}