Timing Sections of C code using macros

timing.h

#ifndef _TIMING_UTIL_H
#define _TIMING_UTIL_H

#ifdef DEBUG
#include <sys/time.h>

#define TIMEIT_INIT(name) \
  struct timeval timeit_t1_##name, timeit_t2_##name, timeit_diff_##name; \
  double timeit_interval_##name  \

#define TIMEIT_START(name) \
  gettimeofday(&timeit_t1_##name, NULL)

#define TIMEIT_STOP(name) \
  do{ \
    gettimeofday(&timeit_t2_##name , NULL); \
    timersub(&timeit_t2_##name, &timeit_t1_##name, &timeit_diff_##name); \
    timeit_interval_##name = timeit_diff_##name.tv_sec + (timeit_diff_##name.tv_usec / 1000000.0 ) ; \
  }while(0)

#define TIMEIT_INTERVAL(name) timeit_interval_##name
  
#define TIMEIT_SHOWME(name) printf("timeit took %f seconds\n", timeit_interval_##name)
  
#else
  #define TIMEIT_INIT(name) 
  #define TIMEIT_START(name) 
  #define TIMEIT_STOP(name) 
  #define TIMEIT_INTERVAL(name) 
  #define TIMEIT_SHOWME(name)
#endif /* DEBUG */
#endif /* _TIMING_UTIL_H */