FreeBSD/Linux Kernel Cross Reference
sys/sys/_semaphore.h
1 /*-
2 * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/sys/_semaphore.h,v 1.6 2006/11/11 16:15:35 trhodes Exp $
27 */
28 #ifndef __SEMAPHORE_H_
29 #define __SEMAPHORE_H_
30
31 typedef intptr_t semid_t;
32 struct timespec;
33
34 #ifndef _KERNEL
35
36 #include <sys/cdefs.h>
37
38 /*
39 * Semaphore definitions.
40 */
41 struct sem {
42 #define SEM_MAGIC ((u_int32_t) 0x09fa4012)
43 u_int32_t magic;
44 pthread_mutex_t lock;
45 pthread_cond_t gtzero;
46 u_int32_t count;
47 u_int32_t nwaiters;
48 #define SEM_USER (NULL)
49 semid_t semid; /* semaphore id if kernel (shared) semaphore */
50 int syssem; /* 1 if kernel (shared) semaphore */
51 LIST_ENTRY(sem) entry;
52 struct sem **backpointer;
53 };
54
55 __BEGIN_DECLS
56
57 int ksem_close(semid_t id);
58 int ksem_post(semid_t id);
59 int ksem_wait(semid_t id);
60 int ksem_trywait(semid_t id);
61 int ksem_timedwait(semid_t id, const struct timespec *abstime);
62 int ksem_init(semid_t *idp, unsigned int value);
63 int ksem_open(semid_t *idp, const char *name, int oflag, mode_t mode,
64 unsigned int value);
65 int ksem_unlink(const char *name);
66 int ksem_getvalue(semid_t id, int *val);
67 int ksem_destroy(semid_t id);
68
69 __END_DECLS
70
71 #endif /* !_KERNEL */
72
73 #endif /* __SEMAPHORE_H_ */
74
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