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| 1 | /* libc-internal interface for mutex locks. Stub version. |
|---|---|
| 2 | Copyright (C) 1996-2022 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, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _LIBC_LOCK_H |
| 20 | #define _LIBC_LOCK_H 1 |
| 21 | |
| 22 | |
| 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 |
| 29 | of libc. */ |
| 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) |
| 34 | |
| 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) |
| 38 | |
| 39 | /* Define an initialized recursive lock variable NAME with storage |
| 40 | class CLASS. */ |
| 41 | #define __libc_lock_define_initialized_recursive(CLASS,NAME) |
| 42 | #define __rtld_lock_define_initialized_recursive(CLASS,NAME) |
| 43 | |
| 44 | /* Initialize the named lock variable, leaving it in a consistent, unlocked |
| 45 | state. */ |
| 46 | #define __libc_lock_init(NAME) |
| 47 | #define __rtld_lock_initialize(NAME) |
| 48 | #define __libc_rwlock_init(NAME) |
| 49 | |
| 50 | /* Same as last but this time we initialize a recursive mutex. */ |
| 51 | #define __libc_lock_init_recursive(NAME) |
| 52 | |
| 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) |
| 58 | |
| 59 | /* Finalize recursive named lock. */ |
| 60 | #define __libc_lock_fini_recursive(NAME) |
| 61 | |
| 62 | /* Lock the named lock variable. */ |
| 63 | #define __libc_lock_lock(NAME) |
| 64 | #define __libc_rwlock_rdlock(NAME) |
| 65 | #define __libc_rwlock_wrlock(NAME) |
| 66 | |
| 67 | /* Lock the recursive named lock variable. */ |
| 68 | #define __libc_lock_lock_recursive(NAME) |
| 69 | #define __rtld_lock_lock_recursive(NAME) |
| 70 | |
| 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 |
| 75 | |
| 76 | /* Try to lock the recursive named lock variable. */ |
| 77 | #define __libc_lock_trylock_recursive(NAME) 0 |
| 78 | |
| 79 | /* Unlock the named lock variable. */ |
| 80 | #define __libc_lock_unlock(NAME) |
| 81 | #define __libc_rwlock_unlock(NAME) |
| 82 | |
| 83 | /* Unlock the recursive named lock variable. */ |
| 84 | #define __libc_lock_unlock_recursive(NAME) |
| 85 | #define __rtld_lock_unlock_recursive(NAME) |
| 86 | |
| 87 | |
| 88 | /* Define once control variable. */ |
| 89 | #define __libc_once_define(CLASS, NAME) CLASS int NAME = 0 |
| 90 | |
| 91 | /* Call handler iff the first call. */ |
| 92 | #define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ |
| 93 | do { \ |
| 94 | if ((ONCE_CONTROL) == 0) { \ |
| 95 | INIT_FUNCTION (); \ |
| 96 | (ONCE_CONTROL) = 1; \ |
| 97 | } \ |
| 98 | } while (0) |
| 99 | |
| 100 | /* Get once control variable. */ |
| 101 | #define __libc_once_get(ONCE_CONTROL) \ |
| 102 | ((ONCE_CONTROL) == 1) |
| 103 | |
| 104 | /* Start a critical region with a cleanup function */ |
| 105 | #define __libc_cleanup_region_start(DOIT, FCT, ARG) \ |
| 106 | { \ |
| 107 | typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \ |
| 108 | typeof (ARG) __save_ARG = ARG; \ |
| 109 | /* close brace is in __libc_cleanup_region_end below. */ |
| 110 | |
| 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); \ |
| 115 | } |
| 116 | |
| 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); \ |
| 121 | |
| 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) |
| 124 | |
| 125 | /* We need portable names for some of the functions. */ |
| 126 | #define __libc_mutex_unlock |
| 127 | |
| 128 | #endif /* libc-lock.h */ |
| 129 |
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