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
|
/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Ulrich Drepper <drepper@redhat.com>, 2002.
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
<https://www.gnu.org/licenses/>. */
#include <semaphore.h>
#include <futex-internal.h>
#include "pthreadP.h"
#define SEM_SHM_PREFIX "sem."
/* Keeping track of currently used mappings. */
struct inuse_sem
{
dev_t dev;
ino_t ino;
int refcnt;
sem_t *sem;
char name[];
};
/* The search tree for existing mappings. */
extern void *__sem_mappings attribute_hidden;
/* Lock to protect the search tree. */
extern int __sem_mappings_lock attribute_hidden;
/* Comparison function for search in tree with existing mappings. */
extern int __sem_search (const void *a, const void *b) attribute_hidden;
static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
{
#if __HAVE_64B_ATOMICS
sem->data = value;
#else
sem->value = value << SEM_VALUE_SHIFT;
sem->nwaiters = 0;
#endif
/* pad is used as a mutex on pre-v9 sparc and ignored otherwise. */
sem->pad = 0;
/* This always is a shared semaphore. */
sem->private = FUTEX_SHARED;
}
/* Prototypes of functions with multiple interfaces. */
extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value);
extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value);
extern int __new_sem_destroy (sem_t *sem);
extern int __new_sem_post (sem_t *sem);
extern int __new_sem_wait (sem_t *sem);
extern int __old_sem_wait (sem_t *sem);
extern int __new_sem_trywait (sem_t *sem);
extern int __new_sem_getvalue (sem_t *sem, int *sval);
#if __TIMESIZE == 64
# define __sem_clockwait64 __sem_clockwait
# define __sem_timedwait64 __sem_timedwait
#else
extern int
__sem_clockwait64 (sem_t *sem, clockid_t clockid,
const struct __timespec64 *abstime);
libpthread_hidden_proto (__sem_clockwait64)
extern int
__sem_timedwait64 (sem_t *sem, const struct __timespec64 *abstime);
libpthread_hidden_proto (__sem_timedwait64)
#endif
|
