94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
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//============== DAE: OS/2 Database Access Engine ===================
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//============== SCB: Sort Control Block ===================
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#ifndef FCB_INCLUDED
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#error scb.h requires fcb.h
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#endif /* FCB_INCLUDED */
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#ifdef SCB_INCLUDED
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#error scb.h already included
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#endif /* SCB_INCLUDED */
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#define SCB_INCLUDED
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typedef ULONG RID, *PRID;
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typedef struct
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{
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PN pn;
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UINT cbfRun;
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} RUN, *PRUN;
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/* choose crunMost so that crunMost % crunMergeMost = crunMergeMost - 1
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/**/
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#define crunMergeMost 16 // max number of runs to be merged
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#define crunMost 31 // size of run directory
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#define fSCBInsert (1<<0)
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#define fSCBIndex (1<<1)
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#define fSCBUnique (1<<2)
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#define SCBSetInsert( pscb ) ((pscb)->fFlags |= fSCBInsert )
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#define SCBResetInsert( pscb ) ((pscb)->fFlags &= ~fSCBInsert )
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#define FSCBInsert( pscb ) ((pscb)->fFlags & fSCBInsert )
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#define SCBSetIndex( pscb ) ((pscb)->fFlags |= fSCBIndex )
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#define SCBResetIndex( pscb ) ((pscb)->fFlags &= ~fSCBIndex )
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#define FSCBIndex( pscb ) ((pscb)->fFlags & fSCBIndex )
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#define SCBSetUnique( pscb ) ((pscb)->fFlags |= fSCBUnique )
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#define SCBResetUnique( pscb ) ((pscb)->fFlags &= ~fSCBUnique )
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#define FSCBUnique( pscb ) ((pscb)->fFlags & fSCBUnique )
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struct _scb
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{
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struct _fcb fcb; // MUST BE FIRST FIELD IN STRUCTURE
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JET_GRBIT grbit; // sort grbit
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INT fFlags; // sort flags
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// in-memory related
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LONG cbSort; // size of sort buffer
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#ifdef WIN16
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HANDLE hrgbSort; // handle for sort buffer
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#endif /* WIN16 */
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BYTE *rgbSort; // sort buffer
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BYTE *pbEnd; // end of last inserted record
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BYTE **rgpb; // beginning of array of pointers
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BYTE **ppbMax; // end of array of pointers
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LONG wRecords; // count of records in sort buffer
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// disk related
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BYTE *rgpbMerge[crunMost];
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struct _bf *rgpbf[crunMergeMost];
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struct _bf *pbfOut; // output buffer
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BYTE *pbOut; // current pos in output buffer
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BYTE *pbMax; // end of output buffer (could be computed)
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RUN rgrun[crunMost]; // run directory
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INT crun;
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INT bf; // input buffers
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INT cpbMerge; // merge tree
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#ifdef DEBUG
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LONG cbfPin;
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LONG lInput;
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LONG lOutput;
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#endif
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};
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#ifdef DEBUG
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#define SCBPin( pscb ) ( (pscb)->cbfPin++ )
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#define SCBUnpin( pscb ) { Assert( (pscb)->cbfPin > 0 ); (pscb)->cbfPin--; }
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#else
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#define SCBPin( pscb )
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#define SCBUnpin( pscb )
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#endif
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#define PscbMEMAlloc() (SCB*)PbMEMAlloc(iresSCB)
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#ifdef DEBUG /* Debug check for illegal use of freed scb */
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#define MEMReleasePscb(pscb) { MEMRelease(iresSCB, (BYTE*)(pscb)); pscb = pscbNil; }
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#else
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#define MEMReleasePscb(pscb) { MEMRelease(iresSCB, (BYTE*)(pscb)); }
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#endif
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