FreeBSD/Linux Kernel Cross Reference
sys/sys/ksem.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #ifndef _POSIX4_KSEM_H_
32 #define _POSIX4_KSEM_H_
33
34 #if !defined(_KERNEL) && !defined(_WANT_FILE)
35 #error "no user-serviceable parts inside"
36 #endif
37
38 #include <sys/condvar.h>
39
40 struct ksem {
41 int ks_ref; /* number of references */
42 mode_t ks_mode; /* protection bits */
43 uid_t ks_uid; /* creator uid */
44 gid_t ks_gid; /* creator gid */
45 unsigned int ks_value; /* current value */
46 struct cv ks_cv; /* waiters sleep here */
47 int ks_waiters; /* number of waiters */
48 int ks_flags;
49
50 /*
51 * Values maintained solely to make this a better-behaved file
52 * descriptor for fstat() to run on.
53 *
54 * XXX: dubious
55 */
56 struct timespec ks_atime;
57 struct timespec ks_mtime;
58 struct timespec ks_ctime;
59 struct timespec ks_birthtime;
60
61 struct label *ks_label; /* MAC label */
62 const char *ks_path;
63 };
64
65 #define KS_ANONYMOUS 0x0001 /* Anonymous (unnamed) semaphore. */
66 #define KS_DEAD 0x0002 /* No new waiters allowed. */
67
68 #endif /* !_POSIX4_KSEM_H_ */
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