从如下所示的代码：我不明白pthread_create函数如何将long类型的线程转换为void* 类型。我知道这是函数的格式，但是long是整数数据类型，而void* 是指针类型。
谢谢你，

int main() {
    long thread;
    pthread_t* thread_handles;
    ready =0;
    /* create an array of thread handles */
    thread_handles = malloc (thread_count*sizeof(pthread_t));

    /* start the threads, giving each a unique rank */
    for (thread = 0; thread < thread_count; thread++)
    {
        pthread_create(&thread_handles[thread], NULL,
          Hello, (void*) thread);
    }

    /* print a message from the main thread */
    printf("Hello from the main thread\n");
    

    /* wait for all threads to complete */
    for (thread = 0; thread < thread_count; thread++)
    {
        pthread_join(thread_handles[thread], NULL);
    }

   /* delete the array of thread handles */
   free(thread_handles);

   return 0;
}

我曾经在https://www.ibm.com/docs/en/zos/2.4.0?topic=functions-pthread-create-create-thread这样的网站上做过研究，但是它没有提到背后的原因。我知道这是格式，但是铸造不应该工作？