tls-support.h

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/*
 * Copyright (c) 2002-2011 Balabit
 * Copyright (c) 1998-2011 Balázs Scheidler
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As an additional exemption you are allowed to compile & link against the
 * OpenSSL libraries as published by the OpenSSL project. See the file
 * COPYING for details.
 */
 
#ifndef TLS_SUPPORT_H_INCLUDED
#define TLS_SUPPORT_H_INCLUDED
 
/* this header is about Thread Local Storage and not about Transport Layer Security */
 
#include <syslog-ng-config.h>
 
#if ! SYSLOG_NG_HAVE_THREAD_KEYWORD
 
#include <stdlib.h>
#include <pthread.h>
 
static struct __slng_tls_variables *
__slng_tls_init_thread(pthread_key_t key, size_t size)
{
  struct __slng_tls_variables *ptr;
 
  ptr = calloc(1, size);
  if (!ptr)
    abort();
 
  pthread_setspecific(key, ptr);
  return ptr;
}
 
static inline struct __slng_tls_variables *__slng_tls_deref_helper(pthread_key_t key, size_t size)
{
  struct __slng_tls_variables *ptr;
 
  ptr = pthread_getspecific(key);
  if (!ptr)
    ptr = __slng_tls_init_thread(key, size);
  return ptr;
}
 
#define TLS_BLOCK_START                                         \
  static pthread_key_t __slng_tls_key;                               \
  static void __attribute__((constructor)) __slng_tls_init_key(void) \
  {                                                             \
    pthread_key_create(&__slng_tls_key, free);                       \
  }                                                             \
                                                                \
  struct __slng_tls_variables
 
#define TLS_BLOCK_END
 
#define __slng_tls_deref(var)   (*({ struct __slng_tls_variables *__ptr = __slng_tls_deref_helper(__slng_tls_key, sizeof(struct __slng_tls_variables)); &__ptr->var; }))
 
#define __thread #
 
#else  /* SYSLOG_NG_HAVE_TLS */
 
#define TLS_BLOCK_START                         \
  struct __slng_tls_variables
 
#define TLS_BLOCK_END                           \
  ;                                             \
  static __thread struct __slng_tls_variables __slng_tls
 
 
#define __slng_tls_deref(var)   (__slng_tls.var)
 
#endif
 
#endif