1 /* $NetBSD: ksem.h,v 1.14 2012/11/25 01:05:04 christos 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 kmutex_t ks_lock; /* lock on this ksem */ 42 kcondvar_t ks_cv; /* condition variable */ 43 u_int ks_ref; /* number of references */ 44 u_int ks_value; /* current value */ 45 u_int ks_waiters; /* number of waiters */ 46 char * ks_name; /* name, if named */ 47 size_t ks_namelen; /* length of name */ 48 int ks_flags; /* for KS_UNLINKED */ 49 mode_t ks_mode; /* protection bits */ 50 uid_t ks_uid; /* creator uid */ 51 gid_t ks_gid; /* creator gid */ 52 } ksem_t; 53 54 int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyout_t); 55 int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int, 56 intptr_t *, copyout_t); 57 int do_ksem_wait(struct lwp *, intptr_t, bool, struct timespec *); 58 59 extern int ksem_max; 60 #endif 61 62 #ifdef _LIBC 63 __BEGIN_DECLS 64 int _ksem_close(intptr_t); 65 int _ksem_destroy(intptr_t); 66 int _ksem_getvalue(intptr_t, int *); 67 int _ksem_init(unsigned int, intptr_t *); 68 int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *); 69 int _ksem_post(intptr_t); 70 int _ksem_timedwait(intptr_t, const struct timespec * __restrict); 71 int _ksem_trywait(intptr_t); 72 int _ksem_unlink(const char *); 73 int _ksem_wait(intptr_t); 74 __END_DECLS 75 #endif /* _LIBC */ 76 77 #endif /* _SYS_KSEM_H_ */ 78