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RocksDB for Erlang

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rocksdb deps snappy third_party benchmark src timers.h
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deps/snappy/third_party/benchmark/src/timers.h 

#ifndef BENCHMARK_TIMERS_H

#define BENCHMARK_TIMERS_H



#include <chrono>

#include <string>



namespace benchmark {



// Return the CPU usage of the current process

double ProcessCPUUsage();



// Return the CPU usage of the children of the current process

double ChildrenCPUUsage();



// Return the CPU usage of the current thread

double ThreadCPUUsage();



#if defined(HAVE_STEADY_CLOCK)

template <bool HighResIsSteady = std::chrono::high_resolution_clock::is_steady>

struct ChooseSteadyClock {

  typedef std::chrono::high_resolution_clock type;

};



template <>

struct ChooseSteadyClock<false> {

  typedef std::chrono::steady_clock type;

};

#endif



struct ChooseClockType {

#if defined(HAVE_STEADY_CLOCK)

  typedef ChooseSteadyClock<>::type type;

#else

  typedef std::chrono::high_resolution_clock type;

#endif

};



inline double ChronoClockNow() {

  typedef ChooseClockType::type ClockType;

  using FpSeconds = std::chrono::duration<double, std::chrono::seconds::period>;

  return FpSeconds(ClockType::now().time_since_epoch()).count();

}



std::string LocalDateTimeString();



}  // end namespace benchmark



#endif  // BENCHMARK_TIMERS_H