adding back files to be reviewed

include/openmc/timer.h

@@ -0,0 +1,67 @@
+#ifndef OPENMC_TIMER_H
+#define OPENMC_TIMER_H
+
+#include <chrono>
+
+namespace openmc {
+
+//==============================================================================
+// Global variables
+//==============================================================================
+
+class Timer;
+
+namespace simulation {
+
+extern Timer time_active;
+extern Timer time_bank;
+extern Timer time_bank_sample;
+extern Timer time_bank_sendrecv;
+extern Timer time_finalize;
+extern Timer time_inactive;
+extern Timer time_initialize;
+extern Timer time_read_xs;
+extern Timer time_tallies;
+extern Timer time_total;
+extern Timer time_transport;
+
+} // namespace simulation
+
+//==============================================================================
+//! Class for measuring time elapsed
+//==============================================================================
+
+class Timer {
+public:
+  using clock = std::chrono::high_resolution_clock;
+
+  Timer() {};
+
+  //! Start running the timer
+  void start();
+
+  //! Get total elapsed time in seconds
+  //! \return Elapsed time in [s]
+  double elapsed();
+
+  //! Stop running the timer
+  void stop();
+
+  //! Stop the timer and reset its elapsed time
+  void reset();
+
+private:
+  bool running_ {false}; //!< is timer running?
+  std::chrono::time_point<clock> start_; //!< starting point for clock
+  double elapsed_ {0.0}; //!< elapsed time in [s]
+};
+
+//==============================================================================
+// Non-member functions
+//==============================================================================
+
+void reset_timers();
+
+} // namespace openmc
+
+#endif // OPENMC_TIMER_H