benchmark.h

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#include <time.h>
 
class Stopwatch
{
public:
  struct timespec m_start;
  struct timespec m_stop;
 
  Stopwatch()
  {
    clock_gettime(CLOCK_MONOTONIC, &m_start);
  }
 
  void start()
  {
    clock_gettime(CLOCK_MONOTONIC, &m_start);
  }
 
  void stop()
  {
    clock_gettime(CLOCK_MONOTONIC, &m_stop);
  }
 
  unsigned int elapsed_us()
  {
    return
      ((m_stop.tv_sec - m_start.tv_sec) * 1000000) +
        (m_stop.tv_nsec - m_start.tv_nsec) / 1000;
  }
};