Import Percona XtraDB into the MariaDB source tree.

1 files changed, 83 insertions, 0 deletions

diff --git a/storage/xtradb/include/btr0sea.ic b/storage/xtradb/include/btr0sea.ic
new file mode 100644
index 00000000000..c948d7e92af
--- /dev/null
+++ b/storage/xtradb/include/btr0sea.ic
@@ -0,0 +1,83 @@
+/*****************************************************************************
+
+Copyright (c) 1996, 2009, Innobase Oy. 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
+Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+
+*****************************************************************************/
+
+/************************************************************************
+The index tree adaptive search
+
+Created 2/17/1996 Heikki Tuuri
+*************************************************************************/
+
+#include "dict0mem.h"
+#include "btr0cur.h"
+#include "buf0buf.h"
+
+/*************************************************************************
+Updates the search info. */
+UNIV_INTERN
+void
+btr_search_info_update_slow(
+/*========================*/
+	btr_search_t*	info,	/* in/out: search info */
+	btr_cur_t*	cursor);/* in: cursor which was just positioned */
+
+/************************************************************************
+Returns search info for an index. */
+UNIV_INLINE
+btr_search_t*
+btr_search_get_info(
+/*================*/
+				/* out: search info; search mutex reserved */
+	dict_index_t*	index)	/* in: index */
+{
+	ut_ad(index);
+
+	return(index->search_info);
+}
+
+/*************************************************************************
+Updates the search info. */
+UNIV_INLINE
+void
+btr_search_info_update(
+/*===================*/
+	dict_index_t*	index,	/* in: index of the cursor */
+	btr_cur_t*	cursor)	/* in: cursor which was just positioned */
+{
+	btr_search_t*	info;
+
+#ifdef UNIV_SYNC_DEBUG
+	ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED));
+	ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX));
+#endif /* UNIV_SYNC_DEBUG */
+
+	info = btr_search_get_info(index);
+
+	info->hash_analysis++;
+
+	if (info->hash_analysis < BTR_SEARCH_HASH_ANALYSIS) {
+
+		/* Do nothing */
+
+		return;
+
+	}
+
+	ut_ad(cursor->flag != BTR_CUR_HASH);
+
+	btr_search_info_update_slow(info, cursor);
+}