nptl/semaphoreP.h

   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
  59
  60 /* Prototypes of functions with multiple interfaces.  */
  61 extern int __new_sem_init (sem_t *sem, int pshared, unsigned int value);
  62 extern int __old_sem_init (sem_t *sem, int pshared, unsigned int value);
  63 extern int __new_sem_destroy (sem_t *sem);
  64 extern int __new_sem_post (sem_t *sem);
  65 extern int __new_sem_wait (sem_t *sem);
  66 extern int __old_sem_wait (sem_t *sem);
  67 extern int __new_sem_trywait (sem_t *sem);
  68 extern int __new_sem_getvalue (sem_t *sem, int *sval);