nptl/semaphoreP.h

   1 /* Copyright (C) 2002, 2003 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 lll_lock_t __sem_mappings_lock;
  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 __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 __new_sem_trywait (sem_t *sem);
  67 extern int __new_sem_getvalue (sem_t *sem, int *sval);