pfs_histogram.h

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/* Copyright (c) 2016, 2024, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
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  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, version 2.0, for more details.
 
  You should have received a copy of the GNU General Public License
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#ifndef PFS_HISTOGRAM_H
#define PFS_HISTOGRAM_H
 
#include <atomic>
#include "my_compiler.h"
#include "my_inttypes.h"
 
/**
  @file storage/perfschema/pfs_histogram.h
*/
 
/** Number of buckets used in histograms. */
#define NUMBER_OF_BUCKETS 450
 
struct PFS_histogram {
 public:
  void reset();
 
  void increment_bucket(uint bucket_index) { ++m_bucket[bucket_index]; }
 
  ulonglong read_bucket(uint bucket_index) { return m_bucket[bucket_index]; }
 
 private:
  std::atomic<ulonglong> m_bucket[NUMBER_OF_BUCKETS];
};
 
struct PFS_histogram_timers {
  ulonglong m_bucket_timer[NUMBER_OF_BUCKETS + 1];
 
  void init();
};
 
extern struct PFS_histogram_timers g_histogram_pico_timers;
 
#endif