/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#ifndef _SYS_SEM_IMPL_H
#define _SYS_SEM_IMPL_H

#include <sys/ipc_impl.h>
#if defined(_KERNEL) || defined(_KMEMUSER)
#include <sys/sem.h>
#include <sys/t_lock.h>
#include <sys/avl.h>
#include <sys/list.h>
#endif

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Argument vectors for the various flavors of semsys().
 */

#define SEMCTL  0
#define SEMGET  1
#define SEMOP   2
#define SEMIDS  3
#define SEMTIMEDOP      4

#if defined(_KERNEL) || defined(_KMEMUSER)

/*
 * There is one semaphore id data structure (semid_ds) for each set of
 * semaphores in the system.
 */
typedef struct ksemid {
        kipc_perm_t     sem_perm;       /* operation permission struct */
        struct sem      *sem_base;      /* ptr to first semaphore in set */
        ushort_t        sem_nsems;      /* # of semaphores in set */
        time_t          sem_otime;      /* last semop time */
        time_t          sem_ctime;      /* last change time */
        int             sem_binary;     /* flag indicating semaphore type */
        int             sem_maxops;     /* maximum number of operations */
        list_t          sem_undos;      /* list of undo structures */
} ksemid_t;

/*
 * There is one semaphore structure (sem) for each semaphore in the system.
 */
struct sem {
        ushort_t        semval;         /* semaphore value */
        pid_t           sempid;         /* pid of last operation */
        ushort_t        semncnt;        /* # awaiting semval > cval */
        ushort_t        semzcnt;        /* # awaiting semval = 0 */
        kcondvar_t      semncnt_cv;
        kcondvar_t      semzcnt_cv;
};

/*
 * There is one undo structure per process in the system.
 */
struct sem_undo {
        avl_node_t      un_avl;         /* node in per-process avl tree */
        list_node_t     un_list;        /* ptr to next active undo structure */
        proc_t          *un_proc;       /* back-pointer to process */
        ksemid_t        *un_sp;         /* back-pointer to semaphore */
        int             un_aoe[1];      /* adjust on exit values */
};
#endif  /* _KERNEL */

#if defined(_SYSCALL32)
/*
 * LP64 view of the ILP32 semid_ds structure
 */
struct semid_ds32 {
        struct ipc_perm32 sem_perm;     /* operation permission struct */
        caddr32_t       sem_base;       /* ptr to first semaphore in set */
        uint16_t        sem_nsems;      /* # of semaphores in set */
        time32_t        sem_otime;      /* last semop time */
        int32_t         sem_pad1;       /* reserved for time_t expansion */
        time32_t        sem_ctime;      /* last semop time */
        int32_t         sem_pad2;       /* reserved for time_t expansion */
        int32_t         sem_binary;     /* flag indicating semaphore type */
        int32_t         sem_pad3[3];    /* reserve area */
};
#endif

#ifdef _KERNEL
extern void semexit(proc_t *);
#endif

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_SEM_IMPL_H */