C - 多处理线程实现 - 指针问题

Question

我只需要写一个代码来计算一个数组的一半的局部最大值..但是有一些问题与 ponters (?) 我看到

segmentation fault

问题

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <stdlib.h>

#define n 10

struct args {
    int index;
    int a[n];
};

void * max_locale(void * parameters) {
    struct args * pp = parameters;
    int max = pp->a[0];
    int finalIndex = pp->index + n/2;
    
    for(int i=pp->index; i<finalIndex; i++) {
        if((pp->a[i]) > (pp->a[i+1])) {
            max = (pp->a[i]);
        }
    }
    return (void *)&max;
}

int main() {
    srand(time(NULL));
    int array[n];
    pthread_t thread1, thread2;
    struct args thread1_args, thread2_args;
    
    printf("-beginning of program-\n");
    
    for(int i=0; i<n; i++) {
        array[i] = rand() % 101;
        printf("%d  ", array[i]);
    }
    for(int i=0; i<n; i++) {
        thread1_args.a[i] = array[i];
        thread2_args.a[i] = array[i];
    }
    
    int * thread1_returnValue; 
    int * thread2_returnValue;
    
    thread2_args.index = 0;
    thread2_args.index = n/2;
    
    
    
    printf("\n Find MAX... \n");
    
    pthread_create(&thread1, NULL, &max_locale, &thread1_args);
    pthread_create(&thread2, NULL, &max_locale, &thread2_args);
    
    pthread_join(thread1, (void **) & thread1_returnValue);
    pthread_join(thread2, (void **) & thread2_returnValue);
    
    printf("Max 1:%d Max 2:%d \n", *thread1_returnValue, *thread2_returnValue);
    
    return 0;
}

这是输出：

-beginning of program-
98 28 73 5 10 100 23 63 25 60
 Find MAX...
zsh: segmentation fault ./15-4-23

我试图用 void * 函数返回 int， 如果我可以在

pthred_create

函数中传递不同的参数，那就容易多了