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50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <semaphore.h>
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#include "pt-internal.h"
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#define SEM_SHM_PREFIX "sem."
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/* Keeping track of currently used mappings. */
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struct inuse_sem
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{
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dev_t dev;
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ino_t ino;
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int refcnt;
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sem_t *sem;
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char name[];
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};
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/* The search tree for existing mappings. */
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extern void *__sem_mappings attribute_hidden;
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/* Lock to protect the search tree. */
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extern int __sem_mappings_lock attribute_hidden;
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/* Comparison function for search in tree with existing mappings. */
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extern int __sem_search (const void *a, const void *b) attribute_hidden;
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static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
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{
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/* This always is a shared semaphore. */
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*sem = (struct new_sem) __SEMAPHORE_INITIALIZER (1, value);
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}
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