172 lines
4.1 KiB
C
Executable File
172 lines
4.1 KiB
C
Executable File
/* @(#)msg.h 1.13 90/03/30 SMI; from S5R2 6.1 */
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/*
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* IPC Message Facility.
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*/
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#ifndef _sys_msg_h
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#define _sys_msg_h
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/*
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* Message Operation Flags.
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*/
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#define MSG_NOERROR 010000 /* no error if big message */
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/*
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* Structure Definitions.
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*/
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/*
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* There is one msg queue id data structure for each q in the system.
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*/
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struct msqid_ds {
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struct ipc_perm msg_perm; /* operation permission struct */
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struct msg *msg_first; /* ptr to first message on q */
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struct msg *msg_last; /* ptr to last message on q */
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ushort msg_cbytes; /* current # bytes on q */
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ushort msg_qnum; /* # of messages on q */
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ushort msg_qbytes; /* max # of bytes on q */
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ushort msg_lspid; /* pid of last msgsnd */
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ushort msg_lrpid; /* pid of last msgrcv */
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time_t msg_stime; /* last msgsnd time */
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time_t msg_rtime; /* last msgrcv time */
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time_t msg_ctime; /* last change time */
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};
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/*
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* User message buffer template for msgsnd and msgrcv system calls.
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*/
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/* HACK :: change the name when compiling the kernel to avoid conflicts */
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#ifdef KERNEL
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struct ipcmsgbuf {
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#else
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struct msgbuf {
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#endif KERNEL
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long mtype; /* message type */
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char mtext[1]; /* message text */
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};
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/*
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* There is one msg structure for each message that may be in the system.
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*/
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struct msg {
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struct msg *msg_next; /* ptr to next message on q */
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long msg_type; /* message type */
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ushort msg_ts; /* message text size */
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ushort msg_spot; /* message text map address */
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};
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#ifdef KERNEL
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/*
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* Implementation Constants.
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*/
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#define PMSG (PZERO + 2) /* message facility sleep priority */
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/*
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* Permission Definitions.
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*/
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#define MSG_R 0400 /* read permission */
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#define MSG_W 0200 /* write permission */
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/*
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* ipc_perm Mode Definitions.
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*/
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#define MSG_RWAIT 001000 /* a reader is waiting for a message */
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#define MSG_WWAIT 002000 /* a writer is waiting to send */
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#define MSG_LOCKED 004000 /* msqid locked */
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#define MSG_LOCKWAIT 010000 /* msqid wanted */
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/* define resource locking macros */
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#define MSGWAKEUP(addr) { \
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curpri = PMSG; \
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wakeup((caddr_t)(addr)); \
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}
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#define MSGLOCK(qp) { \
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while ((qp)->msg_perm.mode & MSG_LOCKED) { \
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(qp)->msg_perm.mode |= MSG_LOCKWAIT; \
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if (sleep((caddr_t)(qp), PMSG | PCATCH)) { \
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(qp)->msg_perm.mode &= ~MSG_LOCKWAIT; \
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u.u_error = EINTR; \
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return (NULL); \
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} \
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} \
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(qp)->msg_perm.mode |= MSG_LOCKED; \
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}
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#define MSGUNLOCK(qp) { \
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(qp)->msg_perm.mode &= ~MSG_LOCKED; \
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if ((qp)->msg_perm.mode & MSG_LOCKWAIT) { \
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(qp)->msg_perm.mode &= ~MSG_LOCKWAIT; \
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MSGWAKEUP(qp); \
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} \
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}
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/*
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* Message information structure.
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*/
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struct msginfo {
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int msgmap, /* # of entries in msg map */
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msgmax, /* max message size */
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msgmnb, /* max # bytes on queue */
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msgmni, /* # of message queue identifiers */
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msgssz, /* msg segment size (should be word size multiple) */
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msgtql; /* # of system message headers */
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ushort msgseg; /* # of msg segments (MUST BE < 32768) */
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};
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struct msginfo msginfo; /* message parameters */
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/*
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* Configuration Parameters
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* These parameters are tuned by editing the system configuration file.
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* The following lines establish the default values.
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*/
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#ifndef MSGPOOL
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#define MSGPOOL 8 /* size, in kilobytes, of message pool */
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#endif
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#ifndef MSGMNB
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#define MSGMNB 2048 /* default max number of bytes on a queue */
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#endif
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#ifndef MSGMNI
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#define MSGMNI 50 /* number of message queue identifiers */
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#endif
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#ifndef MSGTQL
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#define MSGTQL 50 /* # of system message headers */
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#endif
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/* The following parameters are assumed not to require tuning */
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#ifndef MSGMAP
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#define MSGMAP 100 /* number of entries in msg map */
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#endif
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#ifndef MSGMAX
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#define MSGMAX (MSGPOOL * 1024) /* max message size (in bytes) */
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#endif
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#ifndef MSGSSZ
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#define MSGSSZ 8 /* msg segment size (should be word size multiple) */
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#endif
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#define MSGSEG ((MSGPOOL * 1024) / MSGSSZ) /* # segments (MUST BE < 32768) */
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/*
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* Structures allocated in machdep.c
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*/
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char *msg; /* base address of message buffer */
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struct map *msgmap; /* msg allocation map */
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struct msg *msgh; /* message headers */
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struct msqid_ds *msgque; /* msg queue headers */
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#endif KERNEL
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#endif /*!_sys_msg_h*/
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