请解决以上代码在Ubuntu运行中出现的以下问题：called object ‘pthread_create’ is not a function or function pointer pthread_create(&mole_threads[i], NULL, mole_thread, &i);

在Ubuntu运行中出现 "called object ‘pthread_create’ is not a function or function pointer" 的错误，通常是由于没有正确链接线程库引起的。为了解决这个问题，你可以在编译时添加 `-pthread` 选项来显式链接线程库。以下是修改后的代码：

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

#define SCREEN_WIDTH 40
#define SCREEN_HEIGHT 20

char screen[SCREEN_HEIGHT][SCREEN_WIDTH];
pthread_mutex_t screen_mutex = PTHREAD_MUTEX_INITIALIZER;
int score = 0;

typedef struct {
    int x;
    int y;
} Hole;

Hole holes[5];

void init_screen() {
    for (int i = 0; i < SCREEN_HEIGHT; i++) {
        for (int j = 0; j < SCREEN_WIDTH; j++) {
            screen[i][j] = ' ';
        }
    }
}

void display_screen() {
    system("clear");
    for (int i = 0; i < SCREEN_HEIGHT; i++) {
        for (int j = 0; j < SCREEN_WIDTH; j++) {
            printf("%c", screen[i][j]);
        }
        printf("\n");
    }
    printf("Score: %d\n", score);
}

void update_screen(int x, int y, char character) {
    pthread_mutex_lock(&screen_mutex);
    screen[y][x] = character;
    pthread_mutex_unlock(&screen_mutex);
}

void clear_screen(int x, int y) {
    pthread_mutex_lock(&screen_mutex);
    screen[y][x] = ' ';
    pthread_mutex_unlock(&screen_mutex);
}

void* mole_thread(void* arg) {
    int index = *(int*) arg;
    srand(time(NULL) + index); // 根据线程索引设置随机种子
    while (true) {
        int x = rand() % SCREEN_WIDTH;
        int y = rand() % SCREEN_HEIGHT;
        update_screen(x, y, 'M');
        usleep(500000); // 线程休眠0.5秒
        clear_screen(x, y);
        usleep(500000);
    }
    return NULL;
}

void* player_thread(void* arg) {
    char input;
    while (true) {
        scanf(" %c", &input);
        if (input == 'q') {
            break;
        }
        if (input == 'h') {
            pthread_mutex_lock(&screen_mutex);
            for (int i = 0; i < 5; i++) {
                if (screen[holes[i].y][holes[i].x] == 'M') {
                    score++;
                    clear_screen(holes[i].x, holes[i].y);
                }
            }
            pthread_mutex_unlock(&screen_mutex);
        }
    }
    return NULL;
}

int main() {
    init_screen();

    // 创建地鼠洞
    srand(time(NULL));
    for (int i = 0; i < 5; i++) {
        holes[i].x = rand() % SCREEN_WIDTH;
        holes[i].y = rand() % SCREEN_HEIGHT;
    }

    // 创建地鼠线程
    pthread_t mole_threads[5];
    for (int i = 0; i < 5; i++) {
        pthread_create(&mole_threads[i], NULL, mole_thread, &i);
    }

    // 创建玩家线程
    pthread_t player_thread_id;
    pthread_create(&player_thread_id, NULL, player_thread, NULL);

    // 游戏循环
    while (true) {
        display_screen();
        usleep(100000); // 刷新屏幕间隔0.1秒
    }

    // 等待线程结束
    for (int i = 0; i < 5; i++) {
        pthread_join(mole_threads[i], NULL);
    }
    pthread_join(player_thread_id, NULL);

    return 0;
}

在编译时使用以下命令来链接线程库：

gcc -o game game.c -pthread

这样应该就能解决 "called object ‘pthread_create’ is not a function or function pointer" 的问题了。