text: // Copyright (c) 2016-2020, The Solidus Project
  // 
  // All rights reserved.
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  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #pragma once
  
  #include <string>
  #include <stdio.h>
  #include <memory>
  #include "misc_log_ex.h"
  
  namespace tools
  {
  
  class PerformanceTimer;
  
  extern el::Level performance_timer_log_level;
  
  uint64_t get_tick_count();
  uint64_t get_ticks_per_ns();
  uint64_t ticks_to_ns(uint64_t ticks);
  
  class PerformanceTimer
  {
  public:
    PerformanceTimer(bool paused = false);
    ~PerformanceTimer();
    void pause();
    void resume();
    void reset();
    uint64_t value() const;
    operator uint64_t() const { return value(); }
  
  protected:
    uint64_t ticks;
    bool started;
    bool paused;
  };
  
  class LoggingPerformanceTimer: public PerformanceTimer
  {
  public:
    LoggingPerformanceTimer(const std::string &s, const std::string &cat, uint64_t unit, el::Level l = el::Level::Info);
    ~LoggingPerformanceTimer();
  
  private:
    std::string name;
    std::string cat;
    uint64_t unit;
    el::Level level;
  };
  
  void set_performance_timer_log_level(el::Level level);
  
  #define PERF_TIMER_NAME(name) pt_##name
  #define PERF_TIMER_UNIT(name, unit) tools::LoggingPerformanceTimer PERF_TIMER_NAME(name)(#name, "perf." MONERO_DEFAULT_LOG_CATEGORY, unit, tools::performance_timer_log_level)
  #define PERF_TIMER_UNIT_L(name, unit, l) tools::LoggingPerformanceTimer PERF_TIMER_NAME(name)t_##name(#name, "perf." MONERO_DEFAULT_LOG_CATEGORY, unit, l)
  #define PERF_TIMER(name) PERF_TIMER_UNIT(name, 1000000)
  #define PERF_TIMER_L(name, l) PERF_TIMER_UNIT_L(name, 1000000, l)
  #define PERF_TIMER_START_UNIT(name, unit) std::unique_ptr<tools::LoggingPerformanceTimer> PERF_TIMER_NAME(name)(new tools::LoggingPerformanceTimer(#name, "perf." MONERO_DEFAULT_LOG_CATEGORY, unit, el::Level::Info))
  #define PERF_TIMER_START(name) PERF_TIMER_START_UNIT(name, 1000000)
  #define PERF_TIMER_STOP(name) do { PERF_TIMER_NAME(name).reset(NULL); } while(0)
  #define PERF_TIMER_PAUSE(name) PERF_TIMER_NAME(name).pause()
  #define PERF_TIMER_RESUME(name) PERF_TIMER_NAME(name).resume()
  
  }
  