22 lines
944 B
C
22 lines
944 B
C
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void pageWriteRecord(int xid, Page * page, lsn_t lsn, recordid rid, const byte *data);
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void pageReadRecord(int xid, Page * page, recordid rid, byte *buff);
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/**
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* assumes that the page is already loaded in memory. It takes as a
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* parameter a Page, and returns an estimate of the amount of free space on this
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* page. This is either exact, or an underestimate.
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* @todo how should this be handled? */
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int freespace(Page * p);
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void pageInitialize(Page * p);
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#define freespace_ptr(page) shorts_from_end((page), 1)
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#define numslots_ptr(page) shorts_from_end((page), 2)
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#define freelist_ptr(page) shorts_from_end((page), 3)
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#define slot_ptr(page, n) shorts_from_end((page), (2*(n))+4)
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#define slot_length_ptr(page, n) shorts_from_end((page), (2*(n))+5)
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#define record_ptr(page, n) bytes_from_start((page), *slot_ptr((page), (n)))
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#define isValidSlot(page, n) ((*slot_ptr((page), (n)) == INVALID_SLOT) ? 0 : 1)
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