/* Some simple utilities for wall-clock timing.

   The function get_wall_time() returns the wall time in microseconds
   (with an unspecified offset).
*/

#ifdef _WIN32

#include <windows.h>

static int64_t get_wall_time(void) {
  LARGE_INTEGER time,freq;
  assert(QueryPerformanceFrequency(&freq));
  assert(QueryPerformanceCounter(&time));
  return ((double)time.QuadPart / freq.QuadPart) * 1000000;
}

#else
/* Assuming POSIX */

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

static int64_t get_wall_time(void) {
  struct timeval time;
  assert(gettimeofday(&time,NULL) == 0);
  return time.tv_sec * 1000000 + time.tv_usec;
}

#endif