#include <pthread.h>
#include <stdio.h>

typedef enum
  {
    _URC_OK = 0,
    _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
    _URC_END_OF_STACK = 5,
    _URC_HANDLER_FOUND = 6,
    _URC_INSTALL_CONTEXT = 7,
    _URC_CONTINUE_UNWIND = 8,
    _URC_FAILURE = 9
  }
  _Unwind_Reason_Code;

typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn) (void *, void *);
_Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn,
				      void*);

_Unwind_Reason_Code callback(void *p, void *p1)
{
  int *state = p1;
  printf ("%d\n", *state);
  (*state)++;
  return _URC_OK;
}

void *poo()
{
  printf("Hello from the thread\n");
  
  int state = 0;
  _Unwind_Backtrace (callback, &state);

  return NULL;
}

void *bar()
{
  printf("Hello from the main thread\n");
  
  int state = 0;
  _Unwind_Backtrace (callback, &state);

  return NULL;
}

void main () 
{
  pthread_t the_thread;
  pthread_attr_t attrs;

  bar();

  pthread_attr_init(&attrs);
  int retval = pthread_create(&the_thread, &attrs, poo, NULL);

  pthread_join(the_thread, NULL);
}