bits/libc-lock.h

   1 /* libc-internal interface for mutex locks.  Stub version.
   2    Copyright (C) 1996, 1997, 1999 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_LOCK_H
  21 #define _BITS_LIBC_LOCK_H 1
  22
  23
  24 /* Define a lock variable NAME with storage class CLASS.  The lock must be
  25    initialized with __libc_lock_init before it can be used (or define it
  26    with __libc_lock_define_initialized, below).  Use `extern' for CLASS to
  27    declare a lock defined in another module.  In public structure
  28    definitions you must use a pointer to the lock structure (i.e., NAME
  29    begins with a `*'), because its storage size will not be known outside
  30    of libc.  */
  31 #define __libc_lock_define(CLASS,NAME)
  32
  33 /* Define an initialized lock variable NAME with storage class CLASS.  */
  34 #define __libc_lock_define_initialized(CLASS,NAME)
  35
  36 /* Define an initialized recursive lock variable NAME with storage
  37    class CLASS.  */
  38 #define __libc_lock_define_initialized_recursive(CLASS,NAME)
  39
  40 /* Initialize the named lock variable, leaving it in a consistent, unlocked
  41    state.  */
  42 #define __libc_lock_init(NAME)
  43
  44 /* Same as last but this time we initialize a recursive mutex.  */
  45 #define __libc_lock_init_recursive(NAME)
  46
  47 /* Finalize the named lock variable, which must be locked.  It cannot be
  48    used again until __libc_lock_init is called again on it.  This must be
  49    called on a lock variable before the containing storage is reused.  */
  50 #define __libc_lock_fini(NAME)
  51
  52 /* Finalize recursive named lock.  */
  53 #define __libc_lock_fini_recursive(NAME)
  54
  55 /* Lock the named lock variable.  */
  56 #define __libc_lock_lock(NAME)
  57
  58 /* Lock the recursive named lock variable.  */
  59 #define __libc_lock_lock_recursive(NAME)
  60
  61 /* Try to lock the named lock variable.  */
  62 #define __libc_lock_trylock(NAME) 0
  63
  64 /* Try to lock the recursive named lock variable.  */
  65 #define __libc_lock_trylock_recursive(NAME) 0
  66
  67 /* Unlock the named lock variable.  */
  68 #define __libc_lock_unlock(NAME)
  69
  70 /* Unlock the recursive named lock variable.  */
  71 #define __libc_lock_unlock_recursive(NAME)
  72
  73
  74 /* Define once control variable.  */
  75 #define __libc_once_define(CLASS, NAME) CLASS int NAME = 0
  76
  77 /* Call handler iff the first call.  */
  78 #define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
  79   do {                                                                        \
  80     if ((ONCE_CONTROL) == 0) {                                                \
  81       INIT_FUNCTION ();                                                       \
  82       (ONCE_CONTROL) = 1;                                                     \
  83     }                                                                         \
  84   } while (0)
  85
  86
  87 /* Start critical region with cleanup.  */
  88 #define __libc_cleanup_region_start(FCT, ARG)
  89
  90 /* End critical region with cleanup.  */
  91 #define __libc_cleanup_region_end(DOIT)
  92
  93 /* Sometimes we have to exit the block in the middle.  */
  94 #define __libc_cleanup_end(DOIT)
  95
  96
  97 /* We need portable names for some of the functions.  */
  98 #define __libc_mutex_unlock
  99
 100 /* Type for key of thread specific data.  */
 101 typedef int __libc_key_t;
 102
 103 /* Create key for thread specific data.  */
 104 #define __libc_key_create(KEY,DEST) -1
 105
 106 /* Set thread-specific data associated with KEY to VAL.  */
 107 #define __libc_setspecific(KEY,VAL) -1
 108
 109 /* Get thread-specific data associated with KEY.  */
 110 #define __libc_getspecific(KEY) 0
 111
 112 #endif  /* bits/libc-lock.h */