Managed C++/CLI

#include <iostream>
#include <stdio.h>
#include <pthread.h>
#include <assert.h>
#include<complex>

# define BSIZE 10
# define NUM_THREADS 5
using namespace std;


typedef struct {
  char buf[BSIZE];
  int occupied;
  int nextin;
  int nextout;
  pthread_mutex_t mutex;
  pthread_cond_t more;
  pthread_cond_t less;
} buffer_t;

buffer_t buffer;

void producer(buffer_t *b, char item)
{
  pthread_mutex_lock(&b->mutex);

  while (b->occupied >= BSIZE)
    pthread_cond_wait(&b->less, &b->mutex);

  assert(b->occupied < BSIZE);

  b->buf[b->nextin++] = item;

  b->nextin %= BSIZE;
  b->occupied++;
  pthread_cond_signal(&b->more);

  pthread_mutex_unlock(&b->mutex);
}

char consumer(buffer_t *b)
{
  char item;
  pthread_mutex_lock(&b->mutex);
  while(b->occupied <= 0)
    pthread_cond_wait(&b->more, &b->mutex);

  assert(b->occupied > 0);

  item = b->buf[b->nextout++];
  b->nextout %= BSIZE;
  b->occupied--;

  pthread_cond_signal(&b->less);
  pthread_mutex_unlock(&b->mutex);

  return(item);
}

int main(int argc, char* argv[] )
{


  pthread_t ptid;
  pthread_attr_t attr;

  pthread_attr_init(&attr); /* initialize attr with default attributes */
 pthread_create(&ptid, &attr, producer  , NULL);



}