4.3BSD - /usr/ingres/source/iutil/accintern.h

   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	8.1	12/31/84
   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

Defined struct's

Defined macros