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Diffstat (limited to 'sysdeps/generic/libc-lock.h')
| -rw-r--r-- | sysdeps/generic/libc-lock.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/sysdeps/generic/libc-lock.h b/sysdeps/generic/libc-lock.h new file mode 100644 index 0000000000..d5a541e209 --- /dev/null +++ b/sysdeps/generic/libc-lock.h @@ -0,0 +1,140 @@ +/* libc-internal interface for mutex locks. Stub version. + Copyright (C) 1996-2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _LIBC_LOCK_H +#define _LIBC_LOCK_H 1 + + +/* Define a lock variable NAME with storage class CLASS. The lock must be + initialized with __libc_lock_init before it can be used (or define it + with __libc_lock_define_initialized, below). Use `extern' for CLASS to + declare a lock defined in another module. In public structure + definitions you must use a pointer to the lock structure (i.e., NAME + begins with a `*'), because its storage size will not be known outside + of libc. */ +#define __libc_lock_define(CLASS,NAME) +#define __libc_lock_define_recursive(CLASS,NAME) +#define __rtld_lock_define_recursive(CLASS,NAME) +#define __libc_rwlock_define(CLASS,NAME) + +/* Define an initialized lock variable NAME with storage class CLASS. */ +#define __libc_lock_define_initialized(CLASS,NAME) +#define __libc_rwlock_define_initialized(CLASS,NAME) + +/* Define an initialized recursive lock variable NAME with storage + class CLASS. */ +#define __libc_lock_define_initialized_recursive(CLASS,NAME) +#define __rtld_lock_define_initialized_recursive(CLASS,NAME) + +/* Initialize the named lock variable, leaving it in a consistent, unlocked + state. */ +#define __libc_lock_init(NAME) +#define __rtld_lock_initialize(NAME) +#define __libc_rwlock_init(NAME) + +/* Same as last but this time we initialize a recursive mutex. */ +#define __libc_lock_init_recursive(NAME) + +/* Finalize the named lock variable, which must be locked. It cannot be + used again until __libc_lock_init is called again on it. This must be + called on a lock variable before the containing storage is reused. */ +#define __libc_lock_fini(NAME) +#define __libc_rwlock_fini(NAME) + +/* Finalize recursive named lock. */ +#define __libc_lock_fini_recursive(NAME) + +/* Lock the named lock variable. */ +#define __libc_lock_lock(NAME) +#define __libc_rwlock_rdlock(NAME) +#define __libc_rwlock_wrlock(NAME) + +/* Lock the recursive named lock variable. */ +#define __libc_lock_lock_recursive(NAME) +#define __rtld_lock_lock_recursive(NAME) + +/* Try to lock the named lock variable. */ +#define __libc_lock_trylock(NAME) 0 +#define __libc_rwlock_tryrdlock(NAME) 0 +#define __libc_rwlock_trywrlock(NAME) 0 + +/* Try to lock the recursive named lock variable. */ +#define __libc_lock_trylock_recursive(NAME) 0 + +/* Unlock the named lock variable. */ +#define __libc_lock_unlock(NAME) +#define __libc_rwlock_unlock(NAME) + +/* Unlock the recursive named lock variable. */ +#define __libc_lock_unlock_recursive(NAME) +#define __rtld_lock_unlock_recursive(NAME) + + +/* Define once control variable. */ +#define __libc_once_define(CLASS, NAME) CLASS int NAME = 0 + +/* Call handler iff the first call. */ +#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ + do { \ + if ((ONCE_CONTROL) == 0) { \ + INIT_FUNCTION (); \ + (ONCE_CONTROL) = 1; \ + } \ + } while (0) + +/* Get once control variable. */ +#define __libc_once_get(ONCE_CONTROL) \ + ((ONCE_CONTROL) == 1) + +/* Start a critical region with a cleanup function */ +#define __libc_cleanup_region_start(DOIT, FCT, ARG) \ +{ \ + typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \ + typeof (ARG) __save_ARG = ARG; \ + /* close brace is in __libc_cleanup_region_end below. */ + +/* End a critical region started with __libc_cleanup_region_start. */ +#define __libc_cleanup_region_end(DOIT) \ + if ((DOIT) && __save_FCT != 0) \ + (*__save_FCT)(__save_ARG); \ +} + +/* Sometimes we have to exit the block in the middle. */ +#define __libc_cleanup_end(DOIT) \ + if ((DOIT) && __save_FCT != 0) \ + (*__save_FCT)(__save_ARG); \ + +#define __libc_cleanup_push(fct, arg) __libc_cleanup_region_start (1, fct, arg) +#define __libc_cleanup_pop(execute) __libc_cleanup_region_end (execute) + +/* We need portable names for some of the functions. */ +#define __libc_mutex_unlock + +/* Type for key of thread specific data. */ +typedef int __libc_key_t; + +/* Create key for thread specific data. */ +#define __libc_key_create(KEY,DEST) ((void) (KEY), (void) (DEST), -1) + +/* Set thread-specific data associated with KEY to VAL. */ +#define __libc_setspecific(KEY,VAL) ((void) (KEY), (void) (VAL)) + +/* Get thread-specific data associated with KEY. */ +#define __libc_getspecific(KEY) ((void) (KEY), (void *) 0) + +#endif /* libc-lock.h */ |