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nss_tls.h
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1 /*-
2  * Copyright (c) 2003 Networks Associates Technology, Inc.
3  * All rights reserved.
4  *
5  * This software was developed for the FreeBSD Project by
6  * Jacques A. Vidrine, Safeport Network Services, and Network
7  * Associates Laboratories, the Security Research Division of Network
8  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
9  * ("CBOSS"), as part of the DARPA CHATS research program.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  * $FreeBSD: src/lib/libc/include/nss_tls.h,v 1.2 2003/04/21 15:44:25 nectar Exp $
33  *
34  * Macros which generate thread local storage handling code in NSS modules.
35  */
36 #ifndef _NSS_TLS_H_
37 #define _NSS_TLS_H_
38 
39 #define NSS_TLS_HANDLING(name) \
40 static pthread_key_t name##_state_key; \
41 static void name##_keyinit(void); \
42 static int name##_getstate(struct name##_state **); \
43 \
44 static void \
45 name##_keyinit(void) \
46 { \
47  (void)_pthread_key_create(&name##_state_key, name##_endstate); \
48 } \
49 \
50 static int \
51 name##_getstate(struct name##_state **p) \
52 { \
53  static struct name##_state st; \
54  static pthread_once_t keyinit = PTHREAD_ONCE_INIT; \
55  int rv; \
56  \
57  if (!__isthreaded || _pthread_main_np() != 0) { \
58  *p = &st; \
59  return (0); \
60  } \
61  rv = _pthread_once(&keyinit, name##_keyinit); \
62  if (rv != 0) \
63  return (rv); \
64  *p = _pthread_getspecific(name##_state_key); \
65  if (*p != NULL) \
66  return (0); \
67  *p = calloc(1, sizeof(**p)); \
68  if (*p == NULL) \
69  return (ENOMEM); \
70  rv = _pthread_setspecific(name##_state_key, *p); \
71  if (rv != 0) { \
72  free(*p); \
73  *p = NULL; \
74  } \
75  return (rv); \
76 } \
77 /* allow the macro invocation to end with a semicolon */ \
78 typedef int _##name##_bmVjdGFy
79 
80 #endif /* _NSS_TLS_H_ */