1 /* Copyright (C) 2002, 2003, 2006, 2007 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <http://www.gnu.org/licenses/>.  */
18 
19 #include <semaphore.h>
20 #include "pthreadP.h"
21 
22 
23 /* Mount point of the shared memory filesystem.  */
24 struct mountpoint_info
25 {
26   char *dir;
27   size_t dirlen;
28 };
29 
30 /* Keeping track of currently used mappings.  */
31 struct inuse_sem
32 {
33   dev_t dev;
34   ino_t ino;
35   int refcnt;
36   sem_t *sem;
37   char name[0];
38 };
39 
40 
41 /* Variables used in multiple interfaces.  */
42 extern struct mountpoint_info mountpoint attribute_hidden;
43 
44 extern pthread_once_t __namedsem_once attribute_hidden;
45 
46 /* The search tree for existing mappings.  */
47 extern void *__sem_mappings attribute_hidden;
48 
49 /* Lock to protect the search tree.  */
50 extern int __sem_mappings_lock attribute_hidden;
51 
52 
53 /* Initializer for mountpoint.  */
54 extern void __where_is_shmfs (void) attribute_hidden;
55 
56 /* Comparison function for search in tree with existing mappings.  */
57 extern int __sem_search (const void *a, const void *b) attribute_hidden;
58