sem.h revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* 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 1986 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* IPC Semaphore Facility.
*/
#ifndef _sys_sem_h
#define _sys_sem_h
/*
* Semaphore Operation Flags.
*/
#define SEM_UNDO 010000 /* set up adjust on exit entry */
/*
* Semctl Command Definitions.
*/
#define GETNCNT 3 /* get semncnt */
#define GETPID 4 /* get sempid */
#define GETVAL 5 /* get semval */
#define GETALL 6 /* get all semval's */
#define GETZCNT 7 /* get semzcnt */
#define SETVAL 8 /* set semval */
#define SETALL 9 /* set all semval's */
/*
* Structure Definitions.
*/
/*
* There is one semaphore id data structure for each set of semaphores
* in the system.
*/
struct semid_ds {
struct ipc_perm sem_perm; /* operation permission struct */
struct sem *sem_base; /* ptr to first semaphore in set */
ushort sem_nsems; /* # of semaphores in set */
time_t sem_otime; /* last semop time */
time_t sem_ctime; /* last change time */
};
/*
* There is one semaphore structure for each semaphore in the system.
*/
struct sem {
ushort semval; /* semaphore text map address */
short sempid; /* pid of last operation */
ushort semncnt; /* # awaiting semval > cval */
ushort semzcnt; /* # awaiting semval = 0 */
};
/*
* User semaphore template for semop system calls.
*/
struct sembuf {
short sem_num; /* semaphore # */
short sem_op; /* semaphore operation */
short sem_flg; /* operation flags */
};
/*
* 'arg' argument template for semctl system calls.
*/
union semun {
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
ushort *array; /* array for GETALL & SETALL */
};
#ifdef KERNEL
/*
* Implementation Constants.
*/
#define PSEMN (PZERO + 3) /* sleep priority waiting for greater value */
#define PSEMZ (PZERO + 2) /* sleep priority waiting for zero */
#define SEMVMX 32767 /* semaphore maximum value */
#define SEMAEM 16384 /* adjust on exit max value */
/*
* Permission Definitions.
*/
#define SEM_A 0200 /* alter permission */
#define SEM_R 0400 /* read permission */
/*
* There is one undo structure per process in the system.
*/
struct sem_undo {
struct sem_undo *un_np; /* ptr to next active undo structure */
short un_cnt; /* # of active entries */
struct undo {
short un_aoe; /* adjust on exit values */
short un_num; /* semaphore # */
int un_id; /* semid */
} un_ent[1]; /* (semume) undo entries (one minimum) */
};
/*
* semaphore information structure
*/
struct seminfo {
int semmap, /* # of entries in semaphore map */
semmni, /* # of semaphore identifiers */
semmns, /* # of semaphores in system */
semmnu, /* # of undo structures in system */
semmsl, /* max # of semaphores per id */
semopm, /* max # of operations per semop call */
semume, /* max # of undo entries per process */
semusz, /* size in bytes of undo structure */
semvmx, /* semaphore maximum value */
semaem; /* adjust on exit max value */
};
struct seminfo seminfo; /* configuration parameters */
/*
* Configuration Parameters
* These parameters are tuned by editing the system configuration file.
* The following lines establish the default values.
*/
#ifndef SEMMNI
#define SEMMNI 10 /* # of semaphore identifiers */
#endif
#ifndef SEMMNS
#define SEMMNS 60 /* # of semaphores in system */
#endif
#ifndef SEMUME
#define SEMUME 10 /* max # of undo entries per process */
#endif
#ifndef SEMMNU
#define SEMMNU 30 /* # of undo structures in system */
#endif
/* The following parameters are assumed not to require tuning */
#ifndef SEMMAP
#define SEMMAP 30 /* # of entries in semaphore map */
#endif
#ifndef SEMMSL
#define SEMMSL SEMMNS /* max # of semaphores per id */
#endif
#ifndef SEMOPM
#define SEMOPM 100 /* max # of operations per semop call */
#endif
/* size in bytes of undo structure */
#define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
/*
* Structures allocated in machdep.c
*/
struct semid_ds *sema; /* semaphore id pool */
struct sem *sem; /* semaphore pool */
struct map *semmap; /* semaphore allocation map */
struct sem_undo **sem_undo; /* per process undo table */
int *semu; /* undo structure pool */
#endif KERNEL
#endif /*!_sys_sem_h*/