/usr/include/x86_64-linux-gnu/bits/libc-lock.h is in libc6-dev 2.19-0ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | /* libc-internal interface for mutex locks. NPTL version.
Copyright (C) 1996-2014 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; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#ifndef _BITS_LIBC_LOCK_H
#define _BITS_LIBC_LOCK_H 1
#include <pthread.h>
#define __need_NULL
#include <stddef.h>
#ifdef _LIBC
# include <lowlevellock.h>
# include <tls.h>
# include <pthread-functions.h>
# include <errno.h> /* For EBUSY. */
# include <gnu/option-groups.h> /* For __OPTION_EGLIBC_BIG_MACROS. */
#endif
/* Mutex type. */
#if defined _LIBC || defined _IO_MTSAFE_IO
# if (defined NOT_IN_libc && !defined IS_IN_libpthread) || !defined _LIBC
typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t;
# else
typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t;
# endif
#else
typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t;
#endif
/* 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_recursive(CLASS,NAME) \
CLASS __libc_lock_recursive_t NAME;
/* Define an initialized recursive lock variable NAME with storage
class CLASS. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# if LLL_LOCK_INITIALIZER == 0
# define __libc_lock_define_initialized_recursive(CLASS,NAME) \
CLASS __libc_lock_recursive_t NAME;
# else
# define __libc_lock_define_initialized_recursive(CLASS,NAME) \
CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER;
# endif
# define _LIBC_LOCK_RECURSIVE_INITIALIZER \
{ LLL_LOCK_INITIALIZER, 0, NULL }
#else
# define __libc_lock_define_initialized_recursive(CLASS,NAME) \
CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER;
# define _LIBC_LOCK_RECURSIVE_INITIALIZER \
{PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP}
#endif
/* Initialize a recursive mutex. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# define __libc_lock_init_recursive(NAME) \
((NAME) = (__libc_lock_recursive_t) _LIBC_LOCK_RECURSIVE_INITIALIZER, 0)
#else
# define __libc_lock_init_recursive(NAME) \
do { \
if (__pthread_mutex_init != NULL) \
{ \
pthread_mutexattr_t __attr; \
__pthread_mutexattr_init (&__attr); \
__pthread_mutexattr_settype (&__attr, PTHREAD_MUTEX_RECURSIVE_NP); \
__pthread_mutex_init (&(NAME).mutex, &__attr); \
__pthread_mutexattr_destroy (&__attr); \
} \
} while (0)
#endif
/* Finalize recursive named lock. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# define __libc_lock_fini_recursive(NAME) ((void) 0)
#else
# define __libc_lock_fini_recursive(NAME) \
__libc_maybe_call (__pthread_mutex_destroy, (&(NAME).mutex), 0)
#endif
/* Lock the recursive named lock variable. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# if __OPTION_EGLIBC_BIG_MACROS != 1
/* EGLIBC: Declare wrapper function for a big macro if either
!__OPTION_EGLIBC_BIG_MACROS or we are using a back door from
small-macros-fns.c (__OPTION_EGLIBC_BIG_MACROS == 2). */
extern void __libc_lock_lock_recursive_fn (__libc_lock_recursive_t *);
libc_hidden_proto (__libc_lock_lock_recursive_fn);
# endif /* __OPTION_EGLIBC_BIG_MACROS != 1 */
# if __OPTION_EGLIBC_BIG_MACROS
# define __libc_lock_lock_recursive(NAME) \
do { \
void *self = THREAD_SELF; \
if ((NAME).owner != self) \
{ \
lll_lock ((NAME).lock, LLL_PRIVATE); \
(NAME).owner = self; \
} \
++(NAME).cnt; \
} while (0)
# else
# define __libc_lock_lock_recursive(NAME) \
__libc_lock_lock_recursive_fn (&(NAME))
# endif /* __OPTION_EGLIBC_BIG_MACROS */
#else
# define __libc_lock_lock_recursive(NAME) \
__libc_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
#endif
/* Try to lock the recursive named lock variable. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# if __OPTION_EGLIBC_BIG_MACROS != 1
/* EGLIBC: Declare wrapper function for a big macro if either
!__OPTION_EGLIBC_BIG_MACROS or we are using a back door from
small-macros-fns.c (__OPTION_EGLIBC_BIG_MACROS == 2). */
extern int __libc_lock_trylock_recursive_fn (__libc_lock_recursive_t *);
libc_hidden_proto (__libc_lock_trylock_recursive_fn);
# endif /* __OPTION_EGLIBC_BIG_MACROS != 1 */
# if __OPTION_EGLIBC_BIG_MACROS
# define __libc_lock_trylock_recursive(NAME) \
({ \
int result = 0; \
void *self = THREAD_SELF; \
if ((NAME).owner != self) \
{ \
if (lll_trylock ((NAME).lock) == 0) \
{ \
(NAME).owner = self; \
(NAME).cnt = 1; \
} \
else \
result = EBUSY; \
} \
else \
++(NAME).cnt; \
result; \
})
# else
# define __libc_lock_trylock_recursive(NAME) \
__libc_lock_trylock_recursive_fn (&(NAME))
# endif /* __OPTION_EGLIBC_BIG_MACROS */
#else
# define __libc_lock_trylock_recursive(NAME) \
__libc_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)
#endif
/* Unlock the recursive named lock variable. */
#if defined _LIBC && (!defined NOT_IN_libc || defined IS_IN_libpthread)
# if __OPTION_EGLIBC_BIG_MACROS != 1
/* EGLIBC: Declare wrapper function for a big macro if either
!__OPTION_EGLIBC_BIG_MACROS, or we are using a back door from
small-macros-fns.c (__OPTION_EGLIBC_BIG_MACROS == 2). */
extern void __libc_lock_unlock_recursive_fn (__libc_lock_recursive_t *);
libc_hidden_proto (__libc_lock_unlock_recursive_fn);
# endif /* __OPTION_EGLIBC_BIG_MACROS != 1 */
# if __OPTION_EGLIBC_BIG_MACROS
/* We do no error checking here. */
# define __libc_lock_unlock_recursive(NAME) \
do { \
if (--(NAME).cnt == 0) \
{ \
(NAME).owner = NULL; \
lll_unlock ((NAME).lock, LLL_PRIVATE); \
} \
} while (0)
# else
# define __libc_lock_unlock_recursive(NAME) \
__libc_lock_unlock_recursive_fn (&(NAME))
# endif /* __OPTION_EGLIBC_BIG_MACROS */
#else
# define __libc_lock_unlock_recursive(NAME) \
__libc_maybe_call (__pthread_mutex_unlock, (&(NAME).mutex), 0)
#endif
/* Note that for I/O cleanup handling we are using the old-style
cancel handling. It does not have to be integrated with C++ since
no C++ code is called in the middle. The old-style handling is
faster and the support is not going away. */
extern void _pthread_cleanup_push_defer (struct _pthread_cleanup_buffer *buffer,
void (*routine) (void *), void *arg);
extern void _pthread_cleanup_pop_restore (struct _pthread_cleanup_buffer *buffer,
int execute);
/* Start critical region with cleanup. */
#define __libc_cleanup_region_start(DOIT, FCT, ARG) \
{ struct _pthread_cleanup_buffer _buffer; \
int _avail; \
if (DOIT) { \
_avail = PTFAVAIL (_pthread_cleanup_push_defer); \
if (_avail) { \
__libc_ptf_call_always (_pthread_cleanup_push_defer, (&_buffer, FCT, \
ARG)); \
} else { \
_buffer.__routine = (FCT); \
_buffer.__arg = (ARG); \
} \
} else { \
_avail = 0; \
}
/* End critical region with cleanup. */
#define __libc_cleanup_region_end(DOIT) \
if (_avail) { \
__libc_ptf_call_always (_pthread_cleanup_pop_restore, (&_buffer, DOIT));\
} else if (DOIT) \
_buffer.__routine (_buffer.__arg); \
}
/* Hide the definitions which are only supposed to be used inside libc in
a separate file. This file is not present in the installation! */
#ifdef _LIBC
# include "libc-lockP.h"
#endif
#endif /* bits/libc-lock.h */
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