htl/semaphoreP.h

   1 /* Copyright (C) 2002-2021 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <semaphore.h>
  20 #include "pt-internal.h"
  21
  22 #define SEM_SHM_PREFIX  "sem."
  23
  24 /* Keeping track of currently used mappings.  */
  25 struct inuse_sem
  26 {
  27   dev_t dev;
  28   ino_t ino;
  29   int refcnt;
  30   sem_t *sem;
  31   char name[];
  32 };
  33
  34
  35 /* The search tree for existing mappings.  */
  36 extern void *__sem_mappings attribute_hidden;
  37
  38 /* Lock to protect the search tree.  */
  39 extern int __sem_mappings_lock attribute_hidden;
  40
  41
  42 /* Comparison function for search in tree with existing mappings.  */
  43 extern int __sem_search (const void *a, const void *b) attribute_hidden;
  44
  45 static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
  46 {
  47   /* This always is a shared semaphore.  */
  48   *sem = (struct new_sem) __SEMAPHORE_INITIALIZER (1, value);
  49 }