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125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#ifndef PFS_STAT_H
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#define PFS_STAT_H
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/**
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@file storage/perfschema/pfs_stat.h
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Statistics (declarations).
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*/
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/**
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@addtogroup Performance_schema_buffers
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@{
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*/
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/** Usage statistics chain, for a single value and its aggregates. */
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struct PFS_single_stat_chain
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{
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/**
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Control flag.
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Statistics are aggregated only if the control flag is true.
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*/
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bool *m_control_flag;
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/** Next link in the statistics chain. */
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struct PFS_single_stat_chain *m_parent;
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/** Count of values. */
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ulonglong m_count;
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/** Sum of values. */
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ulonglong m_sum;
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/** Minimum value. */
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ulonglong m_min;
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/** Maximum value. */
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ulonglong m_max;
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};
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/**
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Reset a single statistic link.
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Only the current link is reset, parents are not affected.
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@param stat the statistics link to reset
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*/
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inline void reset_single_stat_link(PFS_single_stat_chain *stat)
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{
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stat->m_count= 0;
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stat->m_sum= 0;
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stat->m_min= ULONGLONG_MAX;
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stat->m_max= 0;
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}
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/**
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Aggregate a value to a statistic chain.
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@param stat the aggregated statistic chain
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@param value the value to aggregate
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*/
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inline void aggregate_single_stat_chain(PFS_single_stat_chain *stat,
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ulonglong value)
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{
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do
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{
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if (*stat->m_control_flag)
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{
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stat->m_count++;
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stat->m_sum+= value;
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if (stat->m_min > value)
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stat->m_min= value;
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if (stat->m_max < value)
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stat->m_max= value;
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}
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stat= stat->m_parent;
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}
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while (stat);
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}
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/** Statistics for COND usage. */
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struct PFS_cond_stat
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{
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/** Number of times a condition was signalled. */
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ulonglong m_signal_count;
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/** Number of times a condition was broadcasted. */
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ulonglong m_broadcast_count;
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};
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/** Statistics for FILE usage. */
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struct PFS_file_stat
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{
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/** Number of current open handles. */
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ulong m_open_count;
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/** Count of READ operations. */
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ulonglong m_count_read;
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/** Count of WRITE operations. */
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ulonglong m_count_write;
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/** Number of bytes read. */
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ulonglong m_read_bytes;
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/** Number of bytes written. */
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ulonglong m_write_bytes;
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};
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/**
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Reset file statistic.
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@param stat the statistics to reset
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*/
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inline void reset_file_stat(PFS_file_stat *stat)
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{
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stat->m_open_count= 0;
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stat->m_count_read= 0;
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stat->m_count_write= 0;
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stat->m_read_bytes= 0;
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stat->m_write_bytes= 0;
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}
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/** @} */
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#endif
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