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/* Copyright (c) 2008, 2010, 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 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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
#ifndef PFS_STAT_H
#define PFS_STAT_H
/**
@file storage/perfschema/pfs_stat.h
Statistics (declarations).
*/
/**
@addtogroup Performance_schema_buffers
@{
*/
/** Usage statistics chain, for a single value and its aggregates. */
struct PFS_single_stat_chain
{
/**
Control flag.
Statistics are aggregated only if the control flag is true.
*/
bool *m_control_flag;
/** Next link in the statistics chain. */
struct PFS_single_stat_chain *m_parent;
/** Count of values. */
ulonglong m_count;
/** Sum of values. */
ulonglong m_sum;
/** Minimum value. */
ulonglong m_min;
/** Maximum value. */
ulonglong m_max;
};
/**
Reset a single statistic link.
Only the current link is reset, parents are not affected.
@param stat the statistics link to reset
*/
inline void reset_single_stat_link(PFS_single_stat_chain *stat)
{
stat->m_count= 0;
stat->m_sum= 0;
stat->m_min= ULONGLONG_MAX;
stat->m_max= 0;
}
/**
Aggregate a value to a statistic chain.
@param stat the aggregated statistic chain
@param value the value to aggregate
*/
inline void aggregate_single_stat_chain(PFS_single_stat_chain *stat,
ulonglong value)
{
do
{
if (*stat->m_control_flag)
{
stat->m_count++;
stat->m_sum+= value;
if (stat->m_min > value)
stat->m_min= value;
if (stat->m_max < value)
stat->m_max= value;
}
stat= stat->m_parent;
}
while (stat);
}
/** Statistics for COND usage. */
struct PFS_cond_stat
{
/** Number of times a condition was signalled. */
ulonglong m_signal_count;
/** Number of times a condition was broadcasted. */
ulonglong m_broadcast_count;
};
/** Statistics for FILE usage. */
struct PFS_file_stat
{
/** Number of current open handles. */
ulong m_open_count;
/** Count of READ operations. */
ulonglong m_count_read;
/** Count of WRITE operations. */
ulonglong m_count_write;
/** Number of bytes read. */
ulonglong m_read_bytes;
/** Number of bytes written. */
ulonglong m_write_bytes;
};
/**
Reset file statistic.
@param stat the statistics to reset
*/
inline void reset_file_stat(PFS_file_stat *stat)
{
stat->m_open_count= 0;
stat->m_count_read= 0;
stat->m_count_write= 0;
stat->m_read_bytes= 0;
stat->m_write_bytes= 0;
}
/** @} */
#endif
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