如何理解并编写高效的C语言多线程源代码？

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
// 线程函数
void *print_hello(void *arg) {
    int thread_id = *((int *)arg);
    printf("Hello from thread %d!
", thread_id);
    pthread_exit(NULL);
}
int main() {
    int num_threads = 5; // 线程数量
    pthread_t threads[num_threads]; // 线程ID数组
    int thread_ids[num_threads]; // 线程ID数组
    // 创建线程
    for (int i = 0; i < num_threads; i++) {
        thread_ids[i] = i;
        int rc = pthread_create(&threads[i], NULL, print_hello, (void *)&thread_ids[i]);
        if (rc) {
            printf("Error: Unable to create thread, %d
", rc);
            exit(1);
        }
    }
    // 等待所有线程结束
    for (int i = 0; i < num_threads; i++) {
        pthread_join(threads[i], NULL);
    }
    printf("All threads have finished.
");
    pthread_exit(NULL);
}

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