root / lab4 / .minix-src / include / sys / ksem.h @ 13
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| 1 | 13 | up20180614 | /* $NetBSD: ksem.h,v 1.14 2012/11/25 01:05:04 christos Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * 2. Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | *
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| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 26 | * SUCH DAMAGE.
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| 27 | */
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| 28 | |||
| 29 | #ifndef _SYS_KSEM_H_
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| 30 | #define _SYS_KSEM_H_
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| 31 | |||
| 32 | #include <sys/cdefs.h> |
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| 33 | |||
| 34 | struct timespec;
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| 35 | |||
| 36 | #ifdef _KERNEL
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| 37 | #define KSEM_MAX 128 |
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| 38 | |||
| 39 | typedef struct ksem { |
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| 40 | LIST_ENTRY(ksem) ks_entry; /* global list entry */
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| 41 | kmutex_t ks_lock; /* lock on this ksem */
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| 42 | kcondvar_t ks_cv; /* condition variable */
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| 43 | u_int ks_ref; /* number of references */
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| 44 | u_int ks_value; /* current value */
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| 45 | u_int ks_waiters; /* number of waiters */
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| 46 | char * ks_name; /* name, if named */ |
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| 47 | size_t ks_namelen; /* length of name */
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| 48 | int ks_flags; /* for KS_UNLINKED */ |
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| 49 | mode_t ks_mode; /* protection bits */
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| 50 | uid_t ks_uid; /* creator uid */
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| 51 | gid_t ks_gid; /* creator gid */
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| 52 | } ksem_t; |
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| 53 | |||
| 54 | int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyout_t); |
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| 55 | int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int, |
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| 56 | intptr_t *, copyout_t); |
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| 57 | int do_ksem_wait(struct lwp *, intptr_t, bool, struct timespec *); |
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| 58 | |||
| 59 | extern int ksem_max; |
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| 60 | #endif
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| 61 | |||
| 62 | #ifdef _LIBC
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| 63 | __BEGIN_DECLS |
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| 64 | int _ksem_close(intptr_t);
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| 65 | int _ksem_destroy(intptr_t);
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| 66 | int _ksem_getvalue(intptr_t, int *); |
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| 67 | int _ksem_init(unsigned int, intptr_t *); |
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| 68 | int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *); |
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| 69 | int _ksem_post(intptr_t);
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| 70 | int _ksem_timedwait(intptr_t, const struct timespec * __restrict); |
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| 71 | int _ksem_trywait(intptr_t);
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| 72 | int _ksem_unlink(const char *); |
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| 73 | int _ksem_wait(intptr_t);
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| 74 | __END_DECLS |
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| 75 | #endif /* _LIBC */ |
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| 76 | |||
| 77 | #endif /* _SYS_KSEM_H_ */ |