diff options
Diffstat (limited to 'storage/xtradb/include/page0page.ic')
| -rw-r--r-- | storage/xtradb/include/page0page.ic | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/storage/xtradb/include/page0page.ic b/storage/xtradb/include/page0page.ic index dab9dc742e4..b34408aed17 100644 --- a/storage/xtradb/include/page0page.ic +++ b/storage/xtradb/include/page0page.ic @@ -1,6 +1,6 @@ /***************************************************************************** -Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved. +Copyright (c) 1994, 2011, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -423,7 +423,37 @@ page_rec_is_infimum( return(page_rec_is_infimum_low(page_offset(rec))); } +/************************************************************//** +Returns the nth record of the record list. +This is the inverse function of page_rec_get_n_recs_before(). +@return nth record */ +UNIV_INLINE +rec_t* +page_rec_get_nth( +/*=============*/ + page_t* page, /*!< in: page */ + ulint nth) /*!< in: nth record */ +{ + return((rec_t*) page_rec_get_nth_const(page, nth)); +} + #ifndef UNIV_HOTBACKUP +/************************************************************//** +Returns the middle record of the records on the page. If there is an +even number of records in the list, returns the first record of the +upper half-list. +@return middle record */ +UNIV_INLINE +rec_t* +page_get_middle_rec( +/*================*/ + page_t* page) /*!< in: page */ +{ + ulint middle = (page_get_n_recs(page) + PAGE_HEAP_NO_USER_LOW) / 2; + + return(page_rec_get_nth(page, middle)); +} + /*************************************************************//** Compares a data tuple to a physical record. Differs from the function cmp_dtuple_rec_with_match in the way that the record must reside on an |