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
|
/* 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>
/* Mutex type. */
#if defined _LIBC || defined _IO_MTSAFE_IO
# if (defined NOT_IN_libc && !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 || IS_IN (libpthread))
# define __libc_lock_define_initialized_recursive(CLASS, NAME) \
CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER;
# 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 || IS_IN (libpthread))
# define __libc_lock_init_recursive(NAME) \
((void) ((NAME) = (__libc_lock_recursive_t) _LIBC_LOCK_RECURSIVE_INITIALIZER))
#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 || 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 || IS_IN (libpthread))
# 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_maybe_call (__pthread_mutex_lock, (&(NAME).mutex), 0)
#endif
/* Try to lock the recursive named lock variable. */
#if defined _LIBC && (!defined NOT_IN_libc || IS_IN (libpthread))
# 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_maybe_call (__pthread_mutex_trylock, (&(NAME).mutex), 0)
#endif
/* Unlock the recursive named lock variable. */
#if defined _LIBC && (!defined NOT_IN_libc || IS_IN (libpthread))
/* 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_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 */
|
