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Viewing changes to innobase/include/btr0sea.h

  • Committer: Mark Callaghan
  • Date: 2009-03-08 23:10:48 UTC
  • mfrom: (2676.15.35 merge-5.0-bugteam)
  • Revision ID: mdcallag@gmail.com-20090308231048-98m2y0h6lck93gn1
merge from 5.0

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innobase/include/btr0sea.h
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/*===================*/
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                                /* out, own: search info struct */
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        mem_heap_t*     heap);  /* in: heap where created */
 
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/*********************************************************************
 
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Returns the value of ref_count. The value is protected by
 
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btr_search_latch. */
 
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ulint
 
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btr_search_info_get_ref_count(
 
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/*==========================*/
 
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                                /* out: ref_count value. */
 
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        btr_search_t*   info);  /* in: search info. */
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/*************************************************************************
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Updates the search info. */
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UNIV_INLINE
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struct btr_search_struct{
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        ulint   magic_n;        /* magic number */
 
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        ulint   ref_count;      /* Number of blocks in this index tree
 
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                                that have search index built
 
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                                i.e. block->index points to this index.
 
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                                Protected by btr_search_latch except
 
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                                when during initialization in
 
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                                btr_search_info_create(). */
 
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        /* The following 4 fields are currently not used: */
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        rec_t*  last_search;    /* pointer to the lower limit record of the
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                                previous search; NULL if not known */
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                                or BTR_SEA_SAME_PAGE */
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        dulint  modify_clock;   /* value of modify clock at the time
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                                last_search was stored */
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        /*----------------------*/
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        /* The following 4 fields are not protected by any latch: */
 
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        /* The following fields are not protected by any latch.
 
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        Unfortunately, this means that they must be aligned to
 
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        the machine word, i.e., they cannot be turned into bit-fields. */
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        page_t* root_guess;     /* the root page frame when it was last time
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                                fetched, or NULL */
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        ulint   hash_analysis;  /* when this exceeds a certain value, the