Задача со звездочкой, на логику (про массив)

int array[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

#include <stdio.h>
#include <pthread.h>
 
static int flage = 0, flago = 1;
#define MAXN    (100)
 
typedef struct{
    int *mylock;
    int *theirlock;
    int start;
} threaddata;
 
void *thread(void *arg){
    threaddata *d = (threaddata*)arg;
    for(int i = d->start; i < MAXN+1; i += 2){
        while(*d->mylock);
        printf("%d ", i);
        *d->mylock = 1;
        *d->theirlock = 0;
    }
    return NULL;
}
 
int main(int argc, char **argv){
    pthread_t threade, threado;
    threaddata e = {&flage, &flago, 1};
    threaddata o = {&flago, &flage, 2};
    pthread_create(&threade, NULL, thread, &e);
    pthread_create(&threado, NULL, thread, &o);
    pthread_join(threade, NULL);
    pthread_join(threado, NULL);
    printf("\n");
    return 0;
}

#define _DEFAULT_SOURCE
#include <stdio.h>
#include <pthread.h>
#include <stdatomic.h>
#include <unistd.h>
 
#define NTHREADS    (10)
#define MAXN        (1000)
 
static volatile int flags[NTHREADS] = {0};
 
void *thread(void *arg){
    int idx = *((int*)arg), next = (idx == NTHREADS-1) ? 0 : idx+1;
    for(int i = idx+1; i < MAXN+1; i += NTHREADS){
        while(flags[idx]) usleep(10);
        flags[idx] = 1;
        printf("%d ", i);
        flags[next] = 0;
    }
    return NULL;
}
 
int main(int argc, char **argv){
    pthread_t threads[NTHREADS];
    for(int i = 1; i < NTHREADS; ++i)
        flags[i] = i;
    for(int i = 0; i < NTHREADS; ++i)
        pthread_create(threads + i, NULL, thread, (int*)flags + i);
    for(int i = 0; i < NTHREADS; ++i)
        pthread_join(threads[i], NULL);
    printf("\n");
    return 0;
}

#include <stdio.h>
#include <pthread.h>
 
#define NTHREADS    (10)
#define MAXN        (1000)
 
static pthread_mutex_t mutexes[NTHREADS];
static int idx[NTHREADS];
 
void *thread(void *arg){
    int idx = *((int*)arg), next = (idx == NTHREADS-1) ? 0 : idx+1;
    for(int i = idx+1; i < MAXN+1; i += NTHREADS){
        pthread_mutex_lock(mutexes + idx);
        printf("%d ", i); fflush(stdout);
        pthread_mutex_unlock(mutexes + next);
    }
    return NULL;
}
 
int main(int argc, char **argv){
    pthread_t threads[NTHREADS];
    for(int i = 0; i < NTHREADS; ++i)
        pthread_mutex_lock(mutexes + i);
    for(int i = 0; i < NTHREADS; ++i){
        idx[i] = i;
        pthread_create(threads + i, NULL, thread, idx + i);
    }
    pthread_mutex_unlock(mutexes);
    for(int i = 0; i < NTHREADS; ++i)
        pthread_join(threads[i], NULL);
    printf("\n");
    return 0;
}