/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *	  must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *	  may be used to endorse or promote products derived from this software
 *	  without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)net_internal.c	6.22 (Berkeley) 3/19/91";*/
static char *rcsid = "$Id: net_internal.c,v 1.1 1998/07/21 13:19:46 peter Exp $";
#endif /* LIBC_SCCS and not lint */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include "net_internal.h"

static void _net_init_global(void);

pthread_mutex_t net_iterate_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_once_t init_once = PTHREAD_ONCE_INIT;
static pthread_key_t key;
static int init_status;

/* Performs global initialization. */
char *_net_buf()
{
	char *buf;

	/* Make sure the global initializations have been done. */
	pthread_once(&init_once, _net_init_global);

	/* Initialize thread-specific data for this thread if it hasn't
	 * been done already. */
	buf = (char *) pthread_getspecific(key);
	if (!buf) {
		buf = (char *) malloc(NET_BUFSIZE);
		if (buf == NULL)
			return NULL;
		if (pthread_setspecific(key, buf) < 0) {
			free(buf);
			return NULL;
		}
	}
	return buf;
}

static void _net_init_global()
{
	init_status = pthread_key_create(&key, free);
}