xref: /illumos-gate/usr/src/uts/common/sys/msg_impl.h (revision b2eb1770)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_SYS_MSG_IMPL_H
#define	_SYS_MSG_IMPL_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

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

#ifdef	__cplusplus
extern "C" {
#endif

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

#define	MSGGET	0
#define	MSGCTL	1
#define	MSGRCV	2
#define	MSGSND	3
#define	MSGIDS	4
#define	MSGSNAP	5

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

/*
 * There is one msg structure for each message in the system.
 */
struct msg {
	list_node_t	msg_node;	/* message list node */
	long		msg_type;	/* message type */
	size_t		msg_size;	/* message text size */
	void		*msg_addr;	/* message text address */
	long		msg_flags;	/* message flags */
	long		msg_copycnt;	/* current # of copyouts on message */
};

/*
 * Per message flags
 */
#define	MSG_RCVCOPY	00001	/* msgrcv is copying out this message */
#define	MSG_UNLINKED	00002	/* msg has been unlinked from queue */

/*
 * msg_rcv_cv is now an array of kcondvar_t for performance reason.
 * We use multiple condition variables (kcondvar_t) to avoid needing
 * to wake all readers when sending a single message.
 */
#define	MAX_QNUM	63
#define	MAX_QNUM_CV	64
#define	MSG_QNUM(x)	((x < 1) ? 0 : (x % MAX_QNUM) + 1)

typedef struct kmsqid {
	kipc_perm_t	msg_perm;	/* operation permission struct */
	list_t		msg_list;	/* list of messages on q */
	msglen_t	msg_cbytes;	/* current # bytes on q */
	msgqnum_t	msg_qnum;	/* # of messages on q */
	msgqnum_t	msg_qmax;	/* max # of messages on q */
	msglen_t	msg_qbytes;	/* max # of bytes on q */
	pid_t		msg_lspid;	/* pid of last msgsnd */
	pid_t		msg_lrpid;	/* pid of last msgrcv */
	time_t		msg_stime;	/* last msgsnd time */
	time_t		msg_rtime;	/* last msgrcv time */
	time_t		msg_ctime;	/* last change time */
	uint64_t	msg_snd_cnt;	/* # of waiting senders */
	uint64_t	msg_rcv_cnt[MAX_QNUM_CV]; /* # of waiting receivers */
	kcondvar_t	msg_snd_cv;
	kcondvar_t	msg_rcv_cv[MAX_QNUM_CV];
} kmsqid_t;

#endif	/* _KERNEL */

#if defined(_SYSCALL32)
/*
 * LP64 view of the ILP32 msgbuf structure
 */
struct ipcmsgbuf32 {
	int32_t	mtype;		/* message type */
	char	mtext[1];	/* message text */
};

/*
 * LP64 view of the ILP32 msgsnap_head and msgsnap_mhead structures
 */
struct msgsnap_head32 {
	size32_t msgsnap_size;	/* bytes consumed/required in the buffer */
	size32_t msgsnap_nmsg;	/* number of messages in the buffer */
};

struct msgsnap_mhead32 {
	size32_t msgsnap_mlen;	/* number of bytes in message that follows */
	int32_t	msgsnap_mtype;	/* message type */
};

/*
 * LP64 view of the ILP32 msqid_ds structure
 */
struct msqid_ds32 {
	struct ipc_perm32 msg_perm;	/* operation permission struct */
	caddr32_t	msg_first;	/* ptr to first message on q */
	caddr32_t	msg_last;	/* ptr to last message on q */
	uint32_t	msg_cbytes;	/* current # bytes on q */
	uint32_t	msg_qnum;	/* # of messages on q */
	uint32_t	msg_qbytes;	/* max # of bytes on q */
	pid32_t		msg_lspid;	/* pid of last msgsnd */
	pid32_t		msg_lrpid;	/* pid of last msgrcv */
	time32_t	msg_stime;	/* last msgsnd time */
	int32_t		msg_pad1;	/* reserved for time_t expansion */
	time32_t	msg_rtime;	/* last msgrcv time */
	int32_t		msg_pad2;	/* time_t expansion */
	time32_t	msg_ctime;	/* last change time */
	int32_t		msg_pad3;	/* time expansion */
	int16_t		msg_cv;
	int16_t		msg_qnum_cv;
	int32_t		msg_pad4[3];	/* reserve area */
};
#endif	/* _SYSCALL32 */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_MSG_IMPL_H */