May I present.... PARALLEL FIZZBUZZ (with no safeties).

2fast2fizzbuzz.c

//
//  main.c
//  2fast2fizzbuzz
//

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

typedef struct {
    int number;
    int *go;
} thread_info;

void* do_thread(void *arg) {
    char text[33];
    thread_info ti = *(thread_info*)arg;
    int i = ti.number;
    int *go = ti.go;
    
    while (!*go) { }
    
    if (i % 15 == 0) {
        sprintf(text, "FizzBuzz");
    }
    else if (i % 3 == 0) {
        sprintf(text, "Fizz");
    }
    else if (i % 5 == 0) {
        sprintf(text, "Buzz");
    }
    else {
        sprintf(text, "%d", i);
    }
    
    char *ptr = text;
    while (*ptr) {
        putchar(*ptr++);
        pthread_yield_np();
    }
    
    putchar('\n');
    return NULL;
    
}

int main(int argc, const char * argv[])
{
    int num_threads = 100;
    pthread_t threads[num_threads];
    thread_info threads_info[num_threads];
    int go = 0;
    
    for (int i = 0; i < num_threads; i++) {
        threads_info[i].number = i+1;
        threads_info[i].go = &go;
        
        pthread_create(&threads[i], NULL, do_thread, (void*)&threads_info[i]);
        
    }
    
    go = 1;
    
    for (int i = 0; i < num_threads; i++) {
        pthread_join(threads[i], NULL);
    }
    
    return 0;
}

2fast2fizzbuzzout.txt

12F14BBFF2728FFBB21FF2121FF3131FF3BB4FF3434F44F4BF55FB5F55F66F6BF66FB7F77F77F7BF88FB8F88FF9
9F9BF99FB
i9
uuiui23iu6i89i12i4ui78iu1i34i67i9ui23iu6i8912i4uii8iu
zzzzz

zz
z

z

z
zz

zz
z

z

z
zz
2
zz
z




z
zzzz
zzzzzzzzzzz3zzzzzzzzzz
zzzzzzzzzz


i





B



i


B
u

u








6
zuzuzz
zzzzzz
1z
z

ii8394ii1627ii4uu1ii7384i67i9ii7zz
zz
zz



z

z
zz
zzzzzzzzzz







BBuuzzzz




zzzz





zzBuzz
zzBuzz