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Annotation of 42BSD/ingres/source/iutil/accintern.h, revision 1.1

1.1     ! root        1: /*
        !             2: **  ACCINTERN.H -- internal declarations for the access methods
        !             3: **
        !             4: **     Nothing in here should be needed for the outside world.
        !             5: **
        !             6: **     Version:
        !             7: **             @(#)accintern.h 7.1     2/5/81
        !             8: */
        !             9: 
        !            10: # include      <access.h>
        !            11: 
        !            12: 
        !            13: # define       NACCBUFS        3               /* number of access method buffers */
        !            14: 
        !            15: 
        !            16: /* the following is the access methods buffer */
        !            17: struct accbuf
        !            18: {
        !            19:        /* this stuff is actually stored in the relation */
        !            20:        long            mainpg;         /* next main page (0 - eof) */
        !            21:        long            ovflopg;        /* next ovflo page (0 - none) */
        !            22:        short           nxtlino;        /* next avail line no for this page */
        !            23:        char            firstup[PGSIZE - 12];   /* tuple space */
        !            24:        short           linetab[1];     /* line table at end of buffer - grows down */
        !            25:                                        /* linetab[lineno] is offset into
        !            26:                                        ** the buffer for that line; linetab[nxtlino]
        !            27:                                        ** is free space pointer */
        !            28: 
        !            29:        /* this stuff is not stored in the relation */
        !            30:        long            rel_tupid;      /* unique relation id */
        !            31:        long            thispage;       /* page number of the current page */
        !            32:        int             filedesc;       /* file descriptor for this reln */
        !            33:        struct accbuf   *modf;          /* use time link list forward pointer */
        !            34:        struct accbuf   *modb;          /* back pointer */
        !            35:        int             bufstatus;      /* various bits defined below */
        !            36: };
        !            37: 
        !            38: /* The following assignments are status bits for accbuf.bufstatus */
        !            39: # define       BUF_DIRTY       001     /* page has been changed */
        !            40: # define       BUF_LOCKED      002     /* page has a page lock on it */
        !            41: # define       BUF_DIRECT      004     /* this is a page from isam direct */
        !            42: 
        !            43: /* access method buffer typed differently for various internal operations */
        !            44: struct
        !            45: {
        !            46:        char    acc_buf[NACCBUFS];
        !            47: };
        !            48: 
        !            49: /* pointers to maintain the buffer */
        !            50: extern struct accbuf   *Acc_head;      /* head of the LRU list */
        !            51: extern struct accbuf   *Acc_tail;      /* tail of the LRU list */
        !            52: extern struct accbuf   Acc_buf[NACCBUFS];      /* the buffers themselves */
        !            53: 
        !            54: 
        !            55: /*
        !            56: **  PGTUPLE -- btree index key (a tid and an index key)
        !            57: */
        !            58: 
        !            59: struct pgtuple
        !            60: {
        !            61:        struct tup_id   childtid;               /* the pointer comes before */
        !            62:        char            childtup[MAXTUP];
        !            63: };
        !            64: 
        !            65: 
        !            66: /*
        !            67: **     Global values used by everything
        !            68: */
        !            69: 
        !            70: extern char    *Acctuple;              /* pointer to canonical tuple */
        !            71: extern char    Accanon[MAXTUP];        /* canonical tuple buffer */
        !            72: 
        !            73: /*
        !            74: **  In-line expansion of trace flags.
        !            75: */
        !            76: 
        !            77: extern short   *tT;
        !            78: # ifndef PDP11
        !            79: # ifndef tTf
        !            80: # define tTf(a, b)     ((b < 0) ? tT[a] : (tT[a] & (1 << b)))
        !            81: # endif tTf
        !            82: # endif PDP11

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