third_party/benchmark/src/timers.h

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#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