linuxthreads/sysdeps/pthread/bits/libc-tsd.h

   1 /* libc-internal interface for thread-specific data.  LinuxThreads version.
   2    Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _BITS_LIBC_TSD_H
  21 #define _BITS_LIBC_TSD_H 1
  22
  23
  24 /* Fast thread-specific data internal to libc.  */
  25 enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0,
  26                         _LIBC_TSD_KEY_DL_ERROR,
  27                         _LIBC_TSD_KEY_N };
  28
  29 extern void *(*__libc_internal_tsd_get) __P ((enum __libc_tsd_key_t));
  30 extern int (*__libc_internal_tsd_set) __P ((enum __libc_tsd_key_t,
  31                                             __const void *));
  32
  33 #define __libc_tsd_define(CLASS, KEY)   CLASS void *__libc_tsd_##KEY##_data;
  34 #define __libc_tsd_get(KEY) \
  35   (__libc_internal_tsd_get != NULL \
  36    ? __libc_internal_tsd_get (_LIBC_TSD_KEY_##KEY) \
  37    : __libc_tsd_##KEY##_data)
  38 #define __libc_tsd_set(KEY, VALUE) \
  39   (__libc_internal_tsd_set != NULL \
  40    ? __libc_internal_tsd_set (_LIBC_TSD_KEY_##KEY, (VALUE)) \
  41    : ((__libc_tsd_##KEY##_data = (VALUE)), 0))
  42
  43 #endif  /* bits/libc-tsd.h */