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Annotation of cci/sys/h/shm.h, revision 1.1

1.1     ! root        1: /* @(#)shm.h   6.1 */
        !             2: /*
        !             3: **     IPC Shared Memory Facility.
        !             4: */
        !             5: 
        !             6: /*
        !             7: **     Implementation Constants.
        !             8: */
        !             9: 
        !            10: #define        SHMLBA  NBPG            /* segment low boundary address multiple */
        !            11: #define        P0MASK  0xc0000000      /* P0 address mask */
        !            12: 
        !            13: /*
        !            14: **     Permission Definitions.
        !            15: */
        !            16: 
        !            17: #define        SHM_R   0x0100  /* read permission */
        !            18: #define        SHM_W   0x0080  /* write permission */
        !            19: 
        !            20: /*
        !            21: **     ipc_perm Mode Definitions.
        !            22: */
        !            23: 
        !            24: #define        SHM_CLEAR       0x0200  /* clear segment on next attach */
        !            25: #define        SHM_DEST        0x0400  /* destroy segment when # attached = 0 */
        !            26: 
        !            27: /*
        !            28: **     Message Operation Flags.
        !            29: */
        !            30: 
        !            31: #define        SHM_RDONLY      0x1000  /* attach read-only (else read-write) */
        !            32: #define        SHM_RND         0x2000  /* round attach address to SHMLBA */
        !            33: 
        !            34: /* 
        !            35:  *     Defines for shared memory limits
        !            36:  */
        !            37: 
        !            38: #define SHMMAX (128*NBPG)      /* max. shared memory segment size */
        !            39: #define SHMMIN 1               /* min. shared memory segment size */
        !            40: #define SHMMNI 100             /* max. no. shared memory identifers */
        !            41: #define SHMSEG 6               /* max. attached shared memory segs per proc */
        !            42: #define SHMBRK         16              /* gap (clicks) between data and shared mem */
        !            43: #define SHMALL         1024            /* max shared memory clicks system wide */
        !            44: 
        !            45: /*
        !            46:  *     Defines for swapping
        !            47:  */
        !            48: 
        !            49: #define DMSHM          1024    /* page segment size for disk addresses */
        !            50: #define NSHMDAD                12      /* number of shared memory disk addresses */
        !            51: #define        SHM_SWAP        0x010   /* shared memory segment swapped out */
        !            52: #define SHM_UNLINK     0x020   /* proc unlinked from shared memory segment */
        !            53: 
        !            54: 
        !            55: /*
        !            56: **     Structure Definitions.
        !            57: */
        !            58: 
        !            59: /*
        !            60: **     There is a shmem data structure for each segment in the system.
        !            61: */
        !            62: 
        !            63: struct shmid_ds {
        !            64:        struct ipc_perm shm_perm;       /* operation permission struct */
        !            65:        int             shm_segsz;      /* segment size */
        !            66:        struct proc     *shm_proc;      /* ptr to linked proc, if loaded */
        !            67:        short           shm_pidx;       /* shm_pt index of that proc */
        !            68:        u_short         shm_lpid;       /* pid of last shmop */
        !            69:        u_short         shm_cpid;       /* pid of creator */
        !            70:        u_short         shm_cnattch;    /* # attached in memory */
        !            71:        u_short         shm_nattch;     /* current # attached */
        !            72:        time_t          shm_atime;      /* last shmat time */
        !            73:        time_t          shm_dtime;      /* last shmdt time */
        !            74:        time_t          shm_ctime;      /* last change time */
        !            75:        swblk_t         shm_daddr[NSHMDAD]; /* disk add. of DMSHM pages */
        !            76:        swblk_t         shm_ptdaddr;    /* disk add. of page tables */
        !            77:        short           shm_rssize;     /* resident size */
        !            78:        short           shm_poip;       /* page out in progress count */
        !            79:        u_char          shm_status;     /* status - e.g. swapped out */
        !            80: };
        !            81: 
        !            82: struct shminfo {
        !            83:        int     shmmax, /* max shared memory segment size */
        !            84:                shmmin, /* min shared memory segment size */
        !            85:                shmmni, /* # of shared memory identifiers */
        !            86:                shmseg, /* max attached shared memory segments per process */
        !            87:                shmbrk, /* gap (in clicks) between data and shared memory */
        !            88:                shmall; /* max total shared memory system wide (in clicks) */
        !            89: };
        !            90: 
        !            91: struct shm_pt {
        !            92:        u_int           shm_sva;        /* starting virtual page address */
        !            93:        struct  shmid_ds *shm_shmp;     /* ptr to associated shmem */
        !            94:        struct  proc    *shm_link;      /* next proc sharing this segment */
        !            95:        short           shm_idx;        /* shm_pt index of that proc */
        !            96:        struct  pte     *shm_spte;      /* starting pte entry  */
        !            97:        struct  pte     *shm_epte;      /* ending pte entry */
        !            98:        int             shm_sflg;       /* status flag */
        !            99: };
        !           100: struct shm_pt *vtoshmpt();
        !           101: 
        !           102: #ifdef KERNEL
        !           103: struct shmid_ds *shmem, *shmemNSHMEM;
        !           104: int    dmshm, nshmem;  
        !           105: #endif KERNEL

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