TicToc timing utility for C

tictoc.h

/*
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* timing utility
//

#include <time.h>

// Measuring execution time intervals: each time it is called, it returns
// the delay to the previous call. Remember to call it once for initializing
// internal timer.
// It is intended to be defined in a header file, 
// declared as static inline, so calling it is quick (if it gets actually inlined) and 
// it is file-local (different files, different timers). 
static inline double tictoc() {
  static struct timespec ts = {.tv_sec = 0, .tv_nsec = 0};
  double prev = ts.tv_sec + ts.tv_nsec / 1.0E9;
  clock_gettime(CLOCK_MONOTONIC, &ts);
  return ts.tv_sec + ts.tv_nsec / 1.0E9 - prev;
}