| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 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, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <semaphore.h> |
| 21 | #include "pthreadP.h" |
| 22 | |
| 23 | |
| 24 | /* Mount point of the shared memory filesystem. */ |
| 25 | struct mountpoint_info |
| 26 | { |
| 27 | char *dir; |
| 28 | size_t dirlen; |
| 29 | }; |
| 30 | |
| 31 | /* Keeping track of currently used mappings. */ |
| 32 | struct inuse_sem |
| 33 | { |
| 34 | dev_t dev; |
| 35 | ino_t ino; |
| 36 | int refcnt; |
| 37 | sem_t *sem; |
| 38 | char name[0]; |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | /* Variables used in multiple interfaces. */ |
| 43 | extern struct mountpoint_info mountpoint attribute_hidden; |
| 44 | |
| 45 | extern pthread_once_t __namedsem_once attribute_hidden; |
| 46 | |
| 47 | /* The search tree for existing mappings. */ |
| 48 | extern void *__sem_mappings attribute_hidden; |
| 49 | |
| 50 | /* Lock to protect the search tree. */ |
| 51 | extern int __sem_mappings_lock attribute_hidden; |
| 52 | |
| 53 | |
| 54 | /* Initializer for mountpoint. */ |
| 55 | extern void __where_is_shmfs (void) attribute_hidden; |
| 56 | |
| 57 | /* Comparison function for search in tree with existing mappings. */ |
| 58 | extern int __sem_search (const void *a, const void *b) attribute_hidden; |
| 59 | |
| 60 | |
| 61 | /* Prototypes of functions with multiple interfaces. */ |
| 62 | extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value); |
| 63 | extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value); |
| 64 | extern int __new_sem_destroy (sem_t *sem); |
| 65 | extern int __new_sem_post (sem_t *sem); |
| 66 | extern int __new_sem_wait (sem_t *sem); |
| 67 | extern int __old_sem_wait (sem_t *sem); |
| 68 | extern int __new_sem_trywait (sem_t *sem); |
| 69 | extern int __new_sem_getvalue (sem_t *sem, int *sval); |