net_internal.c
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上传日期:2007-04-14
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文件大小:3k
- /*
- * 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 = "$Id$";
- #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);
- }