shm.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 2005 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 Shared Memory Facility.
*/
#ifndef _sys_shm_h
#define _sys_shm_h
#include <sys/param.h>
/* #include <machine/mmu.h> */
/*
* Shared Memory Operation Flags.
*/
#define SHM_RDONLY 010000 /* attach read-only (else read-write) */
#define SHM_RND 020000 /* round attach address to SHMLBA */
/*
* Shmctl Command Definitions.
*/
#define SHM_LOCK 3 /* Lock segment in core */
#define SHM_UNLOCK 4 /* Unlock segment */
/*
* Implementation Constants.
*/
#define SHMLBA PAGESIZE /* segment low boundary address multiple */
/* (SHMLBA must be a power of 2) */
/*
* Structure Definitions.
*/
/*
* There is a shared mem id data structure for each segment in the system.
*/
struct shmid_ds {
struct ipc_perm shm_perm; /* operation permission struct */
uint shm_segsz; /* size of segment in bytes */
ushort shm_lpid; /* pid of last shmop */
ushort shm_cpid; /* pid of creator */
ushort shm_nattch; /* number of current attaches */
time_t shm_atime; /* last shmat time */
time_t shm_dtime; /* last shmdt time */
time_t shm_ctime; /* last change time */
struct anon_map *shm_amp; /* segment anon_map pointer */
};
#ifdef KERNEL
/*
* Permission Definitions.
*/
#define SHM_W 0200 /* write permission */
#define SHM_R 0400 /* read permission */
/*
* ipc_perm Mode Definitions.
*/
#define SHM_INIT 001000 /* segment not yet initialized */
#define SHM_LOCKED 004000 /* shmid locked */
#define SHM_LOCKWAIT 010000 /* shmid wanted */
#define PSHM (PZERO + 1) /* sleep priority */
/* define resource locking macros */
#define SHMLOCK(sp) { \
while ((sp)->shm_perm.mode & SHM_LOCKED) { \
(sp)->shm_perm.mode |= SHM_LOCKWAIT; \
(void) sleep((caddr_t)(sp), PSHM); \
} \
(sp)->shm_perm.mode |= SHM_LOCKED; \
}
#define SHMUNLOCK(sp) { \
(sp)->shm_perm.mode &= ~SHM_LOCKED; \
if ((sp)->shm_perm.mode & SHM_LOCKWAIT) { \
(sp)->shm_perm.mode &= ~SHM_LOCKWAIT; \
curpri = PSHM; \
wakeup((caddr_t)(sp)); \
} \
}
/*
* Shared Memory information structure
*/
struct shminfo {
int shmmax, /* max shared memory segment size */
shmmin, /* min shared memory segment size */
shmmni, /* # of shared memory identifiers */
shmseg, /* (obsolete) */
shmall; /* (obsolete) */
};
struct shminfo shminfo; /* configuration parameters */
/*
* Configuration Parameters
* These parameters are tuned by editing the system configuration file.
* The following lines establish the default values.
*/
#ifndef SHMSIZE
#define SHMSIZE 1024 /* maximum shared memory segment size (in Kbytes) */
#endif
#ifndef SHMMNI
#define SHMMNI 100 /* # of shared memory identifiers */
#endif
/* The following parameters are assumed not to require tuning */
#define SHMMIN 1 /* min shared memory segment size */
#define SHMMAX (SHMSIZE * 1024) /* max shared memory segment size */
/*
* Structures allocated in machdep.c
*/
struct shmid_ds *shmem; /* shared memory id pool */
#endif KERNEL
#endif /*!_sys_shm_h*/