lib/libc/include/nss_tls.h

   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 1.3 2004/03/30 15:56:15 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         _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 struct _clashproof_bmVjdGFy
  79
  80 #endif /* _NSS_TLS_H_ */