My Producer/Consumer C-Code is not giving any real output - c

Question

I've recently changed my OS from Windows to NitruxOS, and I'm currently struggling a bit with compiling my code.
I tried compiling with:
gcc main.c -Wall -pedantic -std=c99 -D_XOPEN_SOURCE=700 -pthread
but I'm not getting any real output; only the following warning:
*main.c: In function ‘main’: main.c:29:44: warning: ISO C forbids passing argument 3 of ‘pthread_create’ between function pointer and ‘void *’ [-Wpedantic] 29 | pthread_create(&producer[i], NULL, (void*)producer, (void*)&num[i]);
| ^~~~~~~~~~~~~~~ In file included from main.c:4: /usr/include/pthread.h:200:15: note: expected ‘void * (*)(void *)’ but argument is of type ‘void *’ 200 | void *(*__start_routine) (void *),
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.c:34:44: warning: ISO C forbids passing argument 3 of ‘pthread_create’ between function pointer and ‘void *’ [-Wpedantic] 34 | pthread_create(&consumer[i], NULL, (void*)consumer, (void *)&num[i]);
| ^~~~~~~~~~~~~~~ In file included from main.c:4: /usr/include/pthread.h:200:15: note: expected ‘void * (*)(void *)’ but argument is of type ‘void *’ 200 | void *(*__start_routine) (void *),*
My code is as follows:
#include <stdlib.h>
#include <stdio.h>
#include <semaphore.h>
#include <pthread.h>
#define max 10
#define bufferlen 10
sem_t voll;
sem_t leer;
int input = 0;
int output = 0;
int buffer[bufferlen];
pthread_mutex_t mutex;
int main()
{
pthread_t producer[bufferlen], consumer[bufferlen];
pthread_mutex_init(&mutex, NULL);
sem_init(&voll, 0, 0);
sem_init(&leer, 0, bufferlen);
int num[max] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
for(int i = 0; i < 10; i++)
{
pthread_create(&producer[i], NULL, (void*)producer, (void*)&num[i]);
}
for(int i = 0; i < 10; i++)
{
pthread_create(&consumer[i], NULL, (void*)consumer, (void *)&num[i]);
}
for(int i = 0; i < 10; i++)
{
pthread_join(producer[i], NULL);
}
for(int i = 0; i < 10; i++)
{
pthread_join(consumer[i], NULL);
}
pthread_mutex_destroy(&mutex);
sem_destroy(&leer);
sem_destroy(&voll);
return 0;
}
void *producer(void *pptr)
{
int item = 0;
for (int i = 0; i < max; i++)
{
sem_wait(&leer);
pthread_mutex_lock(&mutex);
buffer[input] = item;
printf("Der Producer No. %d hat %d an Stelle %d eingefügt\n", *((int*)pptr), buffer[input], input);
input = (input + 1) % bufferlen;
pthread_mutex_unlock(&mutex);
sem_post(&voll);
}
return NULL;
}
void *consumer(void *cptr)
{
for(int i = 0; i < max; i++)
{
sem_wait(&voll);
pthread_mutex_lock(&mutex);
int item = buffer[output];
printf("Der Consumer No. %d hat %d von Stelle %d entfernt\n", *((int*)cptr), item, output);
output = (output + 1) % bufferlen;
pthread_mutex_unlock(&mutex);
sem_post(&leer);
}
return NULL;
}