/*
* 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 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_MSG_IMPL_H
#define _SYS_MSG_IMPL_H
#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)
typedef struct msgq_wakeup {
list_node_t msgw_list;
long msgw_type; /* Message type request. */
long msgw_snd_wake; /* Type of msg from msgsnd */
size_t msgw_snd_size; /* Designates size of the msg sending */
kthread_t *msgw_thrd; /* Thread waiting */
kcondvar_t msgw_wake_cv; /* waiting on this */
} msgq_wakeup_t;
typedef struct msg_select {
msgq_wakeup_t *(*selection)();
struct msg_select *next_selection;
} msg_select_t;
/*
* 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 MSG_NEG_INTERVAL 8
#define MSG_MAX_QNUM 64
#define MSG_MAX_QNUM_CV 65
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 */
uint_t msg_snd_cnt; /* # of waiting senders */
uint_t msg_rcv_cnt; /* # of waiting receivers */
uint64_t msg_lowest_type; /* Smallest type on queue */
/*
* linked list of routines used to determine what to wake up next.
* msg_fnd_sndr: Routines for waking up readers waiting
* for a message from the sender.
* msg_fnd_rdr: Routines for waking up readers waiting
* for a copyout to finish.
*/
msg_select_t *msg_fnd_sndr;
msg_select_t *msg_fnd_rdr;
/*
* Various counts and queues for controlling the sleeping
* and waking up of processes that are waiting for various
* message queue events.
*
* msg_cpy_block: List of receiving threads that are blocked because
* the message of choice is being copied out.
* msg_wait_snd: List of receiving threads whose type specifier
* is positive or 0 but are blocked because there
* are no matches.
* msg_wait_snd_ngt:
* List of receiving threads whose type specifier is
* negative message type but are blocked because
* there are no types that qualify.
* msg_wait_rcv: List of sending threads that are blocked because
* there is no room left on the message queue.
*/
kcondvar_t msg_snd_cv;
list_t msg_cpy_block;
list_t msg_wait_snd[MSG_MAX_QNUM_CV];
list_t msg_wait_snd_ngt[MSG_MAX_QNUM_CV];
list_t msg_wait_rcv;
size_t msg_snd_smallest; /* Smallest msg on send wait list */
int msg_ngt_cnt; /* # of negative receivers blocked */
char msg_neg_copy; /* Neg type copy underway */
} 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 */