Segmentation fault

[erasm]

Why is this code getting a segmentation fault? how do i fix this?

void *producer(void* cb)
{
        printf("testing\n");
        bufferQueue *cbuffer = (bufferQueue *)cb;
        put_buffer(cbuffer, 17);
        destroy_buffer(cbuffer);
        return cb;
}

int main(void)
{
        semaphore sem;
        bufferQueue cbuffer;
        pthread_t thread;

        init_sem(&sem);
        init_buffer(&cbuffer, sem, 0, 5);

        pthread_create(&thread, NULL, producer, (void*)(&cbuffer));

        pthread_join(thread, NULL);
        return EXIT_SUCCESS;
}

void init_buffer(bufferQueue *b, semaphore s, int min, int max)
{

        b = malloc(sizeof(bufferQueue));
        b->buffer_array = malloc(max*sizeof(int));
        b->in = 0;
        b->out = 0;
        b->min_buffer_size = min;
        b->max_buffer_size = max;
        b->sem = s;

}

void put_buffer(bufferQueue *b, int v)
{

        if((b->in+1)%b->max_buffer_size == b->out)
        {

                semWait(&(b->sem));

        }

        b->buffer_array[b->in] = v;
        b->in = (b->in+1)%b->max_buffer_size;
        semSignal(&(b->sem));

}

[Ronix]

b = malloc(sizeof(bufferQueue));

This is not necessary and is making the init_buffer function modify a chunk of memory that is never used. Thus, cbuffer is left uninitialized.

Also, depending on what init_sem, semWait and semSignal do, you may be getting segmentation faults there.