FreeBSD/Linux Kernel Cross Reference
sys/sys/ksem.h
1 /* $NetBSD: ksem.h,v 1.15 2019/02/03 03:20:24 thorpej Exp $ */
2
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
29 #ifndef _SYS_KSEM_H_
30 #define _SYS_KSEM_H_
31
32 #include <sys/cdefs.h>
33
34 struct timespec;
35
36 #ifdef _KERNEL
37 #define KSEM_MAX 128
38
39 typedef struct ksem {
40 LIST_ENTRY(ksem) ks_entry; /* global list entry */
41 struct proc * ks_pshared_proc;/* owner of pshared sem */
42 intptr_t ks_pshared_id; /* global id for pshared sem */
43 kmutex_t ks_lock; /* lock on this ksem */
44 kcondvar_t ks_cv; /* condition variable */
45 u_int ks_pshared_fd; /* fd in owning proc */
46 u_int ks_ref; /* number of references */
47 u_int ks_value; /* current value */
48 u_int ks_waiters; /* number of waiters */
49 char * ks_name; /* name, if named */
50 size_t ks_namelen; /* length of name */
51 int ks_flags; /* for KS_UNLINKED */
52 mode_t ks_mode; /* protection bits */
53 uid_t ks_uid; /* creator uid */
54 gid_t ks_gid; /* creator gid */
55 } ksem_t;
56
57 int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyin_t, copyout_t);
58 int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int,
59 intptr_t *, copyout_t);
60 int do_ksem_wait(struct lwp *, intptr_t, bool, struct timespec *);
61
62 extern int ksem_max;
63 #endif /* _KERNEL */
64
65 #if defined(_KERNEL) || defined(_LIBC)
66 #define KSEM_PSHARED 0x50535244U /* 'PSRD' */
67
68 #define KSEM_MARKER_MASK 0xff000001U
69 #define KSEM_MARKER_MIN 0x01000001U
70 #define KSEM_PSHARED_MARKER 0x70000001U /* 'p' << 24 | 1 */
71 #endif /* _KERNEL || _LIBC */
72
73 #ifdef _LIBC
74 __BEGIN_DECLS
75 int _ksem_close(intptr_t);
76 int _ksem_destroy(intptr_t);
77 int _ksem_getvalue(intptr_t, int *);
78 int _ksem_init(unsigned int, intptr_t *);
79 int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *);
80 int _ksem_post(intptr_t);
81 int _ksem_timedwait(intptr_t, const struct timespec * __restrict);
82 int _ksem_trywait(intptr_t);
83 int _ksem_unlink(const char *);
84 int _ksem_wait(intptr_t);
85 __END_DECLS
86 #endif /* _LIBC */
87
88 #endif /* _SYS_KSEM_H_ */
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