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
|
/* libc-internal interface for mutex locks. LinuxThreads version.
Copyright (C) 1996, 1997, 1998 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _BITS_LIBC_LOCK_H
#define _BITS_LIBC_LOCK_H 1
#include <pthread.h>
/* Mutex type. */
#ifdef _LIBC
typedef pthread_mutex_t __libc_lock_t;
#else
typedef struct __libc_lock_opaque__ __libc_lock_t;
#endif
/* Type for key to thread-specific data. */
typedef pthread_key_t __libc_key_t;
/* 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) \
CLASS __libc_lock_t NAME;
/* Define an initialized lock variable NAME with storage class CLASS. */
#define __libc_lock_define_initialized(CLASS,NAME) \
CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER;
/* Define an initialized recursive lock variable NAME with storage
class CLASS. */
#define __libc_lock_define_initialized_recursive(CLASS,NAME) \
CLASS __libc_lock_t NAME = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
/* Initialize the named lock variable, leaving it in a consistent, unlocked
state. */
#define __libc_lock_init(NAME) \
(__pthread_mutex_init != NULL ? __pthread_mutex_init (&(NAME), NULL) : 0);
/* Same as last but this time we initialize a recursive mutex. */
#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), &__attr); \
__pthread_mutexattr_destroy (&__attr); \
} \
} while (0);
/* 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) \
(__pthread_mutex_destroy != NULL ? __pthread_mutex_destroy (&(NAME)) : 0);
/* Finalize recursive named lock. */
#define __libc_lock_fini_recursive(NAME) __libc_lock_fini (NAME)
/* Lock the named lock variable. */
#define __libc_lock_lock(NAME) \
(__pthread_mutex_lock != NULL ? __pthread_mutex_lock (&(NAME)) : 0);
/* Lock the recursive named lock variable. */
#define __libc_lock_lock_recursive(NAME) __libc_lock_lock (NAME)
/* Try to lock the named lock variable. */
#define __libc_lock_trylock(NAME) \
(__pthread_mutex_trylock != NULL ? __pthread_mutex_trylock (&(NAME)) : 0)
/* Try to lock the recursive named lock variable. */
#define __libc_lock_trylock_recursive(NAME) __libc_lock_trylock (NAME)
/* Unlock the named lock variable. */
#define __libc_lock_unlock(NAME) \
(__pthread_mutex_unlock != NULL ? __pthread_mutex_unlock (&(NAME)) : 0);
/* Unlock the recursive named lock variable. */
#define __libc_lock_unlock_recursive(NAME) __libc_lock_unlock (NAME)
/* Define once control variable. */
#define __libc_once_define(CLASS, NAME) \
CLASS pthread_once_t NAME = PTHREAD_ONCE_INIT
/* Call handler iff the first call. */
#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \
do { \
if (__pthread_once != NULL) \
__pthread_once (&(ONCE_CONTROL), (INIT_FUNCTION)); \
else if ((ONCE_CONTROL) == 0) { \
INIT_FUNCTION (); \
(ONCE_CONTROL) = 1; \
} \
} while (0)
/* Start critical region with cleanup. */
#define __libc_cleanup_region_start(FCT, ARG) \
{ struct _pthread_cleanup_buffer _buffer; \
int _avail = _pthread_cleanup_push_defer != NULL; \
if (_avail) { \
_pthread_cleanup_push_defer (&_buffer, (FCT), (ARG)); \
}
/* End critical region with cleanup. */
#define __libc_cleanup_region_end(DOIT) \
if (_avail) { \
_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
} \
}
/* Sometimes we have to exit the block in the middle. */
#define __libc_cleanup_end(DOIT) \
if (_avail) { \
_pthread_cleanup_pop_restore (&_buffer, (DOIT)); \
}
/* Create thread-specific key. */
#define __libc_key_create(KEY, DESTRUCTOR) \
(__pthread_key_create != NULL ? __pthread_key_create (KEY, DESTRUCTOR) : 1)
/* Get thread-specific data. */
#define __libc_getspecific(KEY) \
(__pthread_getspecific != NULL ? __pthread_getspecific (KEY) : NULL)
/* Set thread-specific data. */
#define __libc_setspecific(KEY, VALUE) \
(__pthread_setspecific != NULL ? __pthread_setspecific (KEY, VALUE) : 0)
#ifdef _LIBC
/* Fast thread-specific data internal to libc. */
enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0,
_LIBC_TSD_KEY_DL_ERROR,
_LIBC_TSD_KEY_N };
extern void *__libc_internal_tsd_get __P ((enum __libc_tsd_key_t));
extern int __libc_internal_tsd_set __P ((enum __libc_tsd_key_t,
__const void *));
#endif
/* Register handlers to execute before and after `fork'. */
#define __libc_atfork(PREPARE, PARENT, CHILD) \
(__pthread_atfork != NULL ? __pthread_atfork (PREPARE, PARENT, CHILD) : 0)
/* Make the pthread functions weak so that we can elide them from
single-threaded processes. */
#ifdef weak_extern
weak_extern (__pthread_mutex_init)
weak_extern (__pthread_mutex_destroy)
weak_extern (__pthread_mutex_lock)
weak_extern (__pthread_mutex_trylock)
weak_extern (__pthread_mutex_unlock)
weak_extern (__pthread_mutexattr_init)
weak_extern (__pthread_mutexattr_destroy)
weak_extern (__pthread_mutexattr_settype)
weak_extern (__pthread_key_create)
weak_extern (__pthread_setspecific)
weak_extern (__pthread_getspecific)
weak_extern (__libc_internal_tsd_get)
weak_extern (__libc_internal_tsd_set)
weak_extern (__pthread_once)
weak_extern (__pthread_initialize)
weak_extern (__pthread_atfork)
weak_extern (_pthread_cleanup_push_defer)
weak_extern (_pthread_cleanup_pop_restore)
#else
# pragma weak __pthread_mutex_init
# pragma weak __pthread_mutex_destroy
# pragma weak __pthread_mutex_lock
# pragma weak __pthread_mutex_trylock
# pragma weak __pthread_mutex_unlock
# pragma weak __pthread_mutexattr_init
# pragma weak __pthread_mutexattr_destroy
# pragma weak __pthread_mutexattr_settype
# pragma weak __pthread_key_create
# pragma weak __pthread_setspecific
# pragma weak __pthread_getspecific
# pragma weak __libc_internal_tsd_get
# pragma weak __libc_internal_tsd_set
# pragma weak __pthread_once
# pragma weak __pthread_initialize
# pragma weak __pthread_atfork
# pragma weak _pthread_cleanup_push_defer
# pragma weak _pthread_cleanup_pop_restore
#endif
/* We need portable names for some functions. E.g., when they are
used as argument to __libc_cleanup_region_start. */
#define __libc_mutex_unlock __pthread_mutex_unlock
#endif /* bits/libc-lock.h */
|
