Can't get my threads running properly

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

#include "circ_buffer.h"

static char *message = "Threading";

static const unsigned int SIZE = 5;
static circ_buffer_t cb;

static void *producer(void *arg);
static void *consumer(void *arg);

pthread_mutex_t mutex;     //defines the mutex
pthread_cond_t threshold;  //defines the condition
pthread_cond_t full;       //cond if the buffer is full

int main(void)
{
  pthread_t PID, CID;    //define the producer and consumer threads
  pthread_attr_t attr;   //defines the attributes for the threads

  pthread_mutex_init(&mutex, NULL);     //initialize the mutex object
  pthread_cond_init(&threshold, NULL);  //initialize the condition object
  pthread_cond_init(&full, NULL);       //initialize the condition object
 
  printf("heeree\n");
  circ_buffer_init(&cb, SIZE);  //initialize a circular buffer to SIZE
 
  printf("Before the threads\n");
  pthread_create(&PID, &attr, producer, NULL/*SIZE*/); //PROBLEM HERE
  printf("In betwen the threads\n");
  pthread_create(&CID, &attr, consumer, NULL/*SIZE*/); //PROBLEM HERE TOO
  printf("After the threads\n");
 

  /*****joins threads together*****/
  //pthread_join(PID, NULL);
  //pthread_join(CID, NULL);

  /****clean up****/
  pthread_attr_destroy(&attr);
  pthread_mutex_destroy(&mutex);
  pthread_cond_destroy(&threshold);
  pthread_cond_destroy(&full);
 
  circ_buffer_destroy(&cb);
  pthread_exit(NULL);
  //return 0;
}

Well basically I when I run the program, All I get is the fprint statements(used for debugging purposes only).  It doesn't seem to call my producer or consumer function already defined below my main (not included because it's not really neccessary).  I've seem to been able to do the same thing with semaphores, but I can't get the threads to run properly with semaphores.  I was just wondering if it's possible, and can anyone suggest a solution to my problem(s)?  

Thanks in advance!!!