251 lines
7.4 KiB
C
251 lines
7.4 KiB
C
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//
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//------ Page Structure ---------------------------------------------------
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//
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#define cbPage 4096 // database logical page size
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#define ctagMax 256 // default limit on number of tags
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typedef BYTE PGTYP;
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// the pragma is bad for efficiency, but we need it here so that the
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// THREEBYTES will not be aligned on 4-byte boundary
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#pragma pack(1)
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typedef struct _pghdr
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{
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ULONG ulChecksum; // checksum of page, always 1st byte
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ULONG ulDBTimeLow; // database time page dirtied
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PGNO pgnoFDP; // pgno of FDP which owns this page
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SHORT cbFree; // count free bytes
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SHORT ibMic; // minimum used byte
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SHORT ctagMac; // count tags used
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SHORT itagFree; // itag of first free tag
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SHORT cbUncommittedFreed; // bytes freed from this page, but *possibly*
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// uncommitted (this number will always be
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// a subset of cbFree)
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THREEBYTES pgnoPrev; // pgno of previous page
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THREEBYTES pgnoNext; // pgno of next page
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} PGHDR;
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typedef struct _pgtrlr
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{
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PGTYP pgtyp:3;
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BYTE bDBTimeHigh:4;
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BYTE bitModified:1;
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THREEBYTES pgnoThisPage;
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} PGTRLR;
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typedef struct _tag
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{
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SHORT cb;
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SHORT ib;
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} TAG;
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/* tag status
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/**/
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typedef enum { tsLine, tsVacant, tsLink } TS;
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typedef struct _page
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{
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PGHDR;
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TAG rgtag[1];
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BYTE rgbFiller[ cbPage -
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sizeof(PGHDR) - // pghdr
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sizeof(TAG) - // rgtag[1]
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sizeof(BYTE) - // rgbData[1]
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sizeof(PGTRLR) ]; // pgtyp and pgnoThisPage
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BYTE rgbData[1];
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PGTRLR;
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} PAGE;
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#pragma pack()
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STATIC INLINE VOID PMSetDBTime( PAGE *ppage, QWORD qwDBTime )
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{
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QWORDX qwx;
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qwx.qw = qwDBTime;
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ppage->bDBTimeHigh = (BYTE) qwx.h;
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ppage->ulDBTimeLow = qwx.l;
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}
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STATIC INLINE QWORD QwPMDBTime( PAGE *ppage )
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{
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QWORDX qwx;
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qwx.l = ppage->ulDBTimeLow;
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qwx.h = (ULONG) ppage->bDBTimeHigh;
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return qwx.qw;
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}
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STATIC INLINE VOID PMIncDBTime( PAGE *ppage )
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{
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QWORDX qwx;
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qwx.qw = QwPMDBTime( ppage );
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qwx.qw++;
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PMSetDBTime( ppage, qwx.qw );
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}
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#define bitLink (1L<<31)
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#define pgtypFDP ((PGTYP) 0)
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#define pgtypRecord ((PGTYP) 1)
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#define pgtypIndexNC ((PGTYP) 2)
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#define pgtypSort ((PGTYP) 4)
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#define PMSetPageType( ppage, pgtypT ) ( (ppage)->pgtyp = pgtypT )
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#define PMPageTypeOfPage( ppage ) ( (PGTYP)( (ppage)->pgtyp) )
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#ifdef DEBUG
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VOID PMSetModified( SSIB *ssib );
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VOID PMResetModified( SSIB *pssib );
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VOID CheckPgno( PAGE *ppage, PN pn );
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#else
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#define CheckPgno( ppage, pn )
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#define PMSetModified( pssib ) ( (pssib)->pbf->ppage->bitModified = 1 )
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#define PMResetModified( pssib ) ( (pssib)->pbf->ppage->bitModified = 0 )
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#endif
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#define PMPageSetModified( ppage ) ( (ppage)->bitModified = 1 )
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#define PMPageResetModified( ppage ) ( (ppage)->bitModified = 0 )
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#define FPMPageModified( ppage ) ( (ppage)->bitModified )
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#define PMSetPgnoFDP( ppage, pgnoT ) ( (ppage)->pgnoFDP = pgnoT )
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#define PgnoPMPgnoFDPOfPage( ppage ) ( (ppage)->pgnoFDP )
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#define SetPgno( ppage, pgno ) \
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ThreeBytesFromL( &(ppage)->pgnoThisPage, (pgno) )
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#define SetPgnoNext( ppage, pgno ) \
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ThreeBytesFromL( &(ppage)->pgnoNext, (pgno) )
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#define SetPgnoPrev( ppage, pgno ) \
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ThreeBytesFromL( &(ppage)->pgnoPrev, (pgno) )
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#define PgnoFromPage( ppage, ppgno ) \
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LFromThreeBytes( ppgno, &(ppage)->pgnoThisPage )
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#ifdef DEBUG
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#define PgnoNextFromPage( pssib, ppgno ) \
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{ CheckSSIB( pssib ); LFromThreeBytes( ppgno, &(pssib)->pbf->ppage->pgnoNext ); }
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#define PgnoPrevFromPage( pssib, ppgno ) \
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{ CheckSSIB( (pssib) ); LFromThreeBytes( ppgno, &(pssib)->pbf->ppage->pgnoPrev ); }
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#else
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#define PgnoNextFromPage( pssib, ppgno ) \
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LFromThreeBytes( ppgno, &(pssib)->pbf->ppage->pgnoNext )
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#define PgnoPrevFromPage( pssib, ppgno ) \
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LFromThreeBytes( ppgno, &(pssib)->pbf->ppage->pgnoPrev )
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#endif
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#define absdiff( x, y ) ( (x) > (y) ? (x)-(y) : (y)-(x) )
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#define pgdiscont( pgno1, pgno2 ) \
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( ( (pgno1) == 0 ) || ( (pgno2) == 0 ) ? 0 \
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: absdiff( (pgno1), (pgno2) ) / cpgDiscont )
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#define ibPgnoPrevPage ( (INT) (ULONG_PTR)&((PAGE *)0)->pgnoPrev )
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#define ibPgnoNextPage ( (INT) (ULONG_PTR)&((PAGE *)0)->pgnoNext )
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#define ibCbFreeTotal ( (INT) (ULONG_PTR)&((PAGE *)0)->cbFree )
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#define ibCtagMac ( (INT) (ULONG_PTR)&((PAGE *)0)->ctagMac )
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#define ibPgtyp ( (INT) (ULONG_PTR)&((PAGE *)0)->pgtyp )
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#define CbLastFreeSpace(ppage) \
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( (ppage)->ibMic \
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- sizeof(PGHDR) \
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- ( sizeof(TAG) * (ppage)->ctagMac ) )
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#define IbCbFromPtag( ibP, cbP, ptagP ) \
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{ TAG *_ptagT = ptagP; \
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(ibP) = _ptagT->ib; \
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(cbP) = _ptagT->cb; \
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}
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#define PtagFromIbCb( ptagP, ibP, cbP ) \
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{ TAG *_ptagT = ptagP; \
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_ptagT->ib = (SHORT)(ibP); \
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_ptagT->cb = (SHORT)(cbP); \
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}
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#ifdef DEBUG
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#define PMGet( pssib, itagT ) CallS( ErrPMGet( pssib, itagT ) )
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#else
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#define PMGet( pssib, itagT ) \
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{ \
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PAGE *ppageT_ = (pssib)->pbf->ppage; \
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TAG *ptagT_ = &(ppageT_->rgtag[itagT]); \
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Assert( itagT >= 0 ); \
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Assert( itagT < (pssib)->pbf->ppage->ctagMac ); \
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(pssib)->line.pb = (BYTE *)ppageT_ + ptagT_->ib; \
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(pssib)->line.cb = ptagT_->cb; \
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}
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#endif
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#define ItagPMMost( ppage ) ((ppage)->ctagMac - 1)
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BOOL FPMFreeTag( SSIB *pssib, INT citagReq );
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#ifdef DEBUG
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// This call does not guarantee the accuracy of cbUncommittedFree.
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// If accuracy is needed, call CbNDFreePageSpace() instead.
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#define CbPMFreeSpace( pssib ) ( CheckSSIB(pssib), \
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((INT)( (pssib)->pbf->ppage->cbFree - (pssib)->pbf->ppage->cbUncommittedFreed ) ) )
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#else
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#define CbPMFreeSpace( pssib ) \
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((INT)( (pssib)->pbf->ppage->cbFree - (pssib)->pbf->ppage->cbUncommittedFreed ) )
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#endif
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#if 0 // No longer needed with uncommitted freed page space count
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#define PMAllocFreeSpace( pssib, cb ) \
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{ \
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Assert( (INT)(pssib)->pbf->ppage->cbFree >= cb ); \
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(pssib)->pbf->ppage->cbFree -= cb; \
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}
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#define PMFreeFreeSpace( pssib, cb ) \
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{ \
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Assert( (INT)(pssib)->pbf->ppage->cbFree >= 0 ); \
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(pssib)->pbf->ppage->cbFree += cb; \
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Assert( (INT)(pssib)->pbf->ppage->cbFree < cbPage ); \
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}
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#endif
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#ifdef DEBUG
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#define AssertBTFOP(pssib) \
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Assert( PMPageTypeOfPage((pssib)->pbf->ppage) == pgtypSort || \
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PMPageTypeOfPage((pssib)->pbf->ppage) == pgtypFDP || \
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(pssib)->itag != 0 || \
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( CbNDKey( (pssib)->line.pb ) == 0 && \
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!FNDBackLink( *(pssib)->line.pb ) ) \
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)
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#else
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#define AssertBTFOP( pssib )
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#endif
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#define PbPMGetChunk(pssib, ib) &(((BYTE *)((pssib)->pbf->ppage))[ib])
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INT CbPMLinkSpace( SSIB *pssib );
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TS TsPMTagstatus( PAGE *ppage, INT itag );
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VOID PMInitPage( PAGE *ppage, PGNO pgno, PGTYP pgtyp, PGNO pgnoFDP );
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INT ItagPMQueryNextItag( SSIB *pssib );
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ERR ErrPMInsert( SSIB *pssib, LINE *rgline, INT cline );
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VOID PMDelete( SSIB *ssib );
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ERR ErrPMReplace( SSIB *pssib, LINE *rgline, INT cline );
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ERR ErrPMGet( SSIB *pssib, INT itag );
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VOID PMGetLink( SSIB *pssib, INT itag, LINK *plink );
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VOID PMExpungeLink( SSIB *pssib );
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VOID PMReplaceWithLink( SSIB *pssib, SRID srid );
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VOID PMReplaceLink( SSIB *pssib, SRID srid );
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INT CPMIFreeTag( PAGE *ppage );
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BOOL FPMEmptyPage( SSIB *pssib );
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BOOL FPMLastNode( SSIB *pssib );
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BOOL FPMLastNodeWithLinks( SSIB *pssib );
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VOID PMDirty( SSIB *pssib );
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VOID PMReadAsync( PIB *ppib, PN pn );
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ERR ErrPMAccessPage( FUCB *pfucb, PGNO pgno );
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#ifdef DEBUG
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VOID PageConsistent( PAGE *ppage );
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#endif
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