1 /* libc-internal interface for mutex locks. Stub version.
2 Copyright (C) 1996-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
19 #ifndef _BITS_LIBC_LOCK_H
20 #define _BITS_LIBC_LOCK_H 1
23 /* Define a lock variable NAME with storage class CLASS. The lock must be
24 initialized with __libc_lock_init before it can be used (or define it
25 with __libc_lock_define_initialized, below). Use `extern' for CLASS to
26 declare a lock defined in another module. In public structure
27 definitions you must use a pointer to the lock structure (i.e., NAME
28 begins with a `*'), because its storage size will not be known outside
30 #define __libc_lock_define(CLASS,NAME)
31 #define __libc_lock_define_recursive(CLASS,NAME)
32 #define __rtld_lock_define_recursive(CLASS,NAME)
33 #define __libc_rwlock_define(CLASS,NAME)
35 /* Define an initialized lock variable NAME with storage class CLASS. */
36 #define __libc_lock_define_initialized(CLASS,NAME)
37 #define __libc_rwlock_define_initialized(CLASS,NAME)
39 /* Define an initialized recursive lock variable NAME with storage
41 #define __libc_lock_define_initialized_recursive(CLASS,NAME)
42 #define __rtld_lock_define_initialized_recursive(CLASS,NAME)
44 /* Initialize the named lock variable, leaving it in a consistent, unlocked
46 #define __libc_lock_init(NAME)
47 #define __rtld_lock_initialize(NAME)
48 #define __libc_rwlock_init(NAME)
50 /* Same as last but this time we initialize a recursive mutex. */
51 #define __libc_lock_init_recursive(NAME)
53 /* Finalize the named lock variable, which must be locked. It cannot be
54 used again until __libc_lock_init is called again on it. This must be
55 called on a lock variable before the containing storage is reused. */
56 #define __libc_lock_fini(NAME)
57 #define __libc_rwlock_fini(NAME)
59 /* Finalize recursive named lock. */
60 #define __libc_lock_fini_recursive(NAME)
62 /* Lock the named lock variable. */
63 #define __libc_lock_lock(NAME)
64 #define __libc_rwlock_rdlock(NAME)
65 #define __libc_rwlock_wrlock(NAME)
67 /* Lock the recursive named lock variable. */
68 #define __libc_lock_lock_recursive(NAME)
69 #define __rtld_lock_lock_recursive(NAME)
71 /* Try to lock the named lock variable. */
72 #define __libc_lock_trylock(NAME) 0
73 #define __libc_rwlock_tryrdlock(NAME) 0
74 #define __libc_rwlock_trywrlock(NAME) 0
76 /* Try to lock the recursive named lock variable. */
77 #define __libc_lock_trylock_recursive(NAME) 0
79 /* Unlock the named lock variable. */
80 #define __libc_lock_unlock(NAME)
81 #define __libc_rwlock_unlock(NAME)
83 /* Unlock the recursive named lock variable. */
84 #define __libc_lock_unlock_recursive(NAME)
85 #define __rtld_lock_unlock_recursive(NAME)
88 /* Define once control variable. */
89 #define __libc_once_define(CLASS, NAME) CLASS int NAME = 0
91 /* Call handler iff the first call. */
92 #define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
94 if ((ONCE_CONTROL) == 0) { \
100 /* Get once control variable. */
101 #define __libc_once_get(ONCE_CONTROL) \
102 ((ONCE_CONTROL) == 1)
104 /* Start a critical region with a cleanup function */
105 #define __libc_cleanup_region_start(DOIT, FCT, ARG) \
107 typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \
108 typeof (ARG) __save_ARG = ARG; \
109 /* close brace is in __libc_cleanup_region_end below. */
111 /* End a critical region started with __libc_cleanup_region_start. */
112 #define __libc_cleanup_region_end(DOIT) \
113 if ((DOIT) && __save_FCT != 0) \
114 (*__save_FCT)(__save_ARG); \
117 /* Sometimes we have to exit the block in the middle. */
118 #define __libc_cleanup_end(DOIT) \
119 if ((DOIT) && __save_FCT != 0) \
120 (*__save_FCT)(__save_ARG); \
122 #define __libc_cleanup_push(fct, arg) __libc_cleanup_region_start (1, fct, arg)
123 #define __libc_cleanup_pop(execute) __libc_cleanup_region_end (execute)
125 /* We need portable names for some of the functions. */
126 #define __libc_mutex_unlock
128 /* Type for key of thread specific data. */
129 typedef int __libc_key_t;
131 /* Create key for thread specific data. */
132 #define __libc_key_create(KEY,DEST) ((void) (KEY), (void) (DEST), -1)
134 /* Set thread-specific data associated with KEY to VAL. */
135 #define __libc_setspecific(KEY,VAL) ((void) (KEY), (void) (VAL))
137 /* Get thread-specific data associated with KEY. */
138 #define __libc_getspecific(KEY) ((void) (KEY), (void *) 0)
140 #endif /* bits/libc-lock.h */