numpy array 升维

《CSAPP》（第3版）答案（第十二章）（一）

???HiHi: P16怎么可能是对的嘛 void* thread_function(void* arg) { int thread_num = *((int*)arg); printf("Thread %d is running.\n", thread_num); // 模拟一些工作 sleep(1); printf("Thread %d is finished.\n", thread_num); return NULL; } int main(int argc, char* argv[]) { if (argc != 2) { fprintf(stderr, "Usage: %s <number_of_threads>\n", argv[0]); return EXIT_FAILURE; } int n = atoi(argv[1]); if (n <= 0) { fprintf(stderr, "Please enter a valid number of threads.\n"); return EXIT_FAILURE; } pthread_t* threads = malloc(n * sizeof(pthread_t)); int* thread_ids = malloc(n * sizeof(int)); // 创建 n 个线程 for (int i = 0; i < n; i++) { thread_ids[i] = i + 1; // 线程编号从 1 开始 if (pthread_create(&threads[i], NULL, thread_function, &thread_ids[i]) != 0) { perror("Failed to create thread"); free(threads); free(thread_ids); return EXIT_FAILURE; } } // 等待所有线程完成