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/* $NetBSD: ksem.h,v 1.15.30.1 2023/08/09 17:42:01 martin Exp $ */
/*
* Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS_KSEM_H_
#define _SYS_KSEM_H_
#include <sys/cdefs.h>
#include <sys/types.h>
struct timespec;
#ifdef _KERNEL
#include <sys/condvar.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#ifndef _KMEMUSER /* XXX hack for fstat(8) */
#include <sys/systm.h>
#endif
struct lwp;
struct proc;
#define KSEM_MAX 128
typedef struct ksem {
LIST_ENTRY(ksem) ks_entry; /* global list entry */
struct proc * ks_pshared_proc;/* owner of pshared sem */
intptr_t ks_pshared_id; /* global id for pshared sem */
kmutex_t ks_lock; /* lock on this ksem */
kcondvar_t ks_cv; /* condition variable */
u_int ks_pshared_fd; /* fd in owning proc */
u_int ks_ref; /* number of references */
u_int ks_value; /* current value */
u_int ks_waiters; /* number of waiters */
char * ks_name; /* name, if named */
size_t ks_namelen; /* length of name */
int ks_flags; /* for KS_UNLINKED */
mode_t ks_mode; /* protection bits */
uid_t ks_uid; /* creator uid */
gid_t ks_gid; /* creator gid */
} ksem_t;
int do_ksem_init(struct lwp *, unsigned int, intptr_t *, copyin_t, copyout_t);
int do_ksem_open(struct lwp *, const char *, int, mode_t, unsigned int,
intptr_t *, copyout_t);
int do_ksem_wait(struct lwp *, intptr_t, bool, struct timespec *);
extern int ksem_max;
#endif /* _KERNEL */
#if defined(_KERNEL) || defined(_LIBC)
#define KSEM_PSHARED 0x50535244U /* 'PSRD' */
#define KSEM_MARKER_MASK 0xff000001U
#define KSEM_MARKER_MIN 0x01000001U
#define KSEM_PSHARED_MARKER 0x70000001U /* 'p' << 24 | 1 */
#endif /* _KERNEL || _LIBC */
#ifdef _LIBC
__BEGIN_DECLS
int _ksem_close(intptr_t);
int _ksem_destroy(intptr_t);
int _ksem_getvalue(intptr_t, int *);
int _ksem_init(unsigned int, intptr_t *);
int _ksem_open(const char *, int, mode_t, unsigned int, intptr_t *);
int _ksem_post(intptr_t);
int _ksem_timedwait(intptr_t, const struct timespec * __restrict);
int _ksem_trywait(intptr_t);
int _ksem_unlink(const char *);
int _ksem_wait(intptr_t);
__END_DECLS
#endif /* _LIBC */
#endif /* _SYS_KSEM_H_ */
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