bits/libc-lock.h

   1 /* libc-internal interface for mutex locks.  Stub version.
   2    Copyright (C) 1996, 1997, 1999, 2000 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    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 #define __libc_rwlock_define(CLASS,NAME)
  33
  34 /* Define an initialized lock variable NAME with storage class CLASS.  */
  35 #define __libc_lock_define_initialized(CLASS,NAME)
  36 #define __libc_rwlock_define_initialized(CLASS,NAME)
  37
  38 /* Define an initialized recursive lock variable NAME with storage
  39    class CLASS.  */
  40 #define __libc_lock_define_initialized_recursive(CLASS,NAME)
  41
  42 /* Initialize the named lock variable, leaving it in a consistent, unlocked
  43    state.  */
  44 #define __libc_lock_init(NAME)
  45 #define __libc_rwlock_init(NAME)
  46
  47 /* Same as last but this time we initialize a recursive mutex.  */
  48 #define __libc_lock_init_recursive(NAME)
  49
  50 /* Finalize the named lock variable, which must be locked.  It cannot be
  51    used again until __libc_lock_init is called again on it.  This must be
  52    called on a lock variable before the containing storage is reused.  */
  53 #define __libc_lock_fini(NAME)
  54 #define __libc_rwlock_fini(NAME)
  55
  56 /* Finalize recursive named lock.  */
  57 #define __libc_lock_fini_recursive(NAME)
  58
  59 /* Lock the named lock variable.  */
  60 #define __libc_lock_lock(NAME)
  61 #define __libc_rwlock_rdlock(NAME)
  62 #define __libc_rwlock_wrlock(NAME)
  63
  64 /* Lock the recursive named lock variable.  */
  65 #define __libc_lock_lock_recursive(NAME)
  66
  67 /* Try to lock the named lock variable.  */
  68 #define __libc_lock_trylock(NAME) 0
  69 #define __libc_rwlock_tryrdlock(NAME) 0
  70 #define __libc_rwlock_trywrlock(NAME) 0
  71
  72 /* Try to lock the recursive named lock variable.  */
  73 #define __libc_lock_trylock_recursive(NAME) 0
  74
  75 /* Unlock the named lock variable.  */
  76 #define __libc_lock_unlock(NAME)
  77 #define __libc_rwlock_unlock(NAME)
  78
  79 /* Unlock the recursive named lock variable.  */
  80 #define __libc_lock_unlock_recursive(NAME)
  81
  82
  83 /* Define once control variable.  */
  84 #define __libc_once_define(CLASS, NAME) CLASS int NAME = 0
  85
  86 /* Call handler iff the first call.  */
  87 #define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
  88   do {                                                                        \
  89     if ((ONCE_CONTROL) == 0) {                                                \
  90       INIT_FUNCTION ();                                                       \
  91       (ONCE_CONTROL) = 1;                                                     \
  92     }                                                                         \
  93   } while (0)
  94
  95
  96 /* Start critical region with cleanup.  */
  97 #define __libc_cleanup_region_start(FCT, ARG)
  98
  99 /* End critical region with cleanup.  */
 100 #define __libc_cleanup_region_end(DOIT)
 101
 102 /* Sometimes we have to exit the block in the middle.  */
 103 #define __libc_cleanup_end(DOIT)
 104
 105
 106 /* We need portable names for some of the functions.  */
 107 #define __libc_mutex_unlock
 108
 109 /* Type for key of thread specific data.  */
 110 typedef int __libc_key_t;
 111
 112 /* Create key for thread specific data.  */
 113 #define __libc_key_create(KEY,DEST) -1
 114
 115 /* Set thread-specific data associated with KEY to VAL.  */
 116 #define __libc_setspecific(KEY,VAL) -1
 117
 118 /* Get thread-specific data associated with KEY.  */
 119 #define __libc_getspecific(KEY) 0
 120
 121 #endif  /* bits/libc-lock.h */