debug.c

/*
 * Copyright (c) 2014  Wu, Xingbo <wuxb45@gmail.com>
 *
 * All rights reserved. No warranty, explicit or implicit, provided.
 */

#define _GNU_SOURCE
#define _LARGEFILE64_SOURCE

#include <sys/time.h>
#include <stdio.h>
#include <execinfo.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>

  uint64_t
debug_time_usec(void)
{
  struct timeval tv;
  gettimeofday(&tv, NULL);
  return tv.tv_sec * 1000000lu + tv.tv_usec;
}

  double
debug_time_sec(void)
{
  const uint64_t usec = debug_time_usec();
  return ((double)usec) / 1000000.0;
}

  uint64_t
debug_diff_usec(const uint64_t last)
{
  return debug_time_usec() - last;
}

  double
debug_diff_sec(const double last)
{
  return debug_time_sec() - last;
}

  uint64_t
debug_tv_diff(const struct timeval * const t0, const struct timeval * const t1)
{
  return UINT64_C(1000000) * (t1->tv_sec - t0->tv_sec) + (t1->tv_usec - t0->tv_usec);
}

  void
debug_print_tv_diff(char * tag, const struct timeval t0, const struct timeval t1)
{
  printf("%s: %lu us\n", tag, debug_tv_diff(&t0, &t1));
}

  void
debug_trace (void)
{
  void *array[100];
  char **strings;

  const int size = backtrace(array, 100);
  strings = backtrace_symbols(array, size);

  printf("Obtained %d stack frames.\n", size);

  int i;
  for (i = 0; i < size; i++)
    printf ("%d -> %s\n", i, strings[i]);

  free (strings);
}