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-rw-r--r--sql/ha_handler_stats.h59
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+#ifndef HA_HANDLER_STATS_INCLUDED
+#define HA_HANDLER_STATS_INCLUDED
+/*
+ Copyright (c) 2023, MariaDB Foundation
+
+ 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA
+*/
+
+/* Definitions for parameters to do with handler-routines */
+
+class ha_handler_stats
+{
+public:
+ ulonglong pages_accessed; /* Pages accessed from page cache */
+ ulonglong pages_updated; /* Pages changed in page cache */
+ ulonglong pages_read_count; /* Pages read from disk */
+ ulonglong pages_read_time; /* Time reading pages, in microsec. */
+ ulonglong undo_records_read;
+ ulonglong engine_time; /* Time spent in engine in microsec */
+ uint active; /* <> 0 if status has to be updated */
+#define first_stat pages_accessed
+#define last_stat engine_time
+ inline void reset()
+ {
+ bzero((void*) this, sizeof(*this));
+ }
+ inline void add(ha_handler_stats *stats)
+ {
+ ulonglong *to= &first_stat;
+ ulonglong *from= &stats->first_stat;
+ do
+ {
+ (*to)+= *from++;
+ } while (to++ != &last_stat);
+ }
+ inline bool has_stats()
+ {
+ ulonglong *to= &first_stat;
+ do
+ {
+ if (*to)
+ return 1;
+ } while (to++ != &last_stat);
+ return 0;
+ }
+};
+#endif /* HA_HANDLER_STATS_INCLUDED */