{

std::function<void(std::shared_ptr<void>)> fun;

std::shared_ptr<void> args;

{

static pthread_mutex_t lock;

static pthread_cond_t notify;

static std::vector<pthread_t> threads;

static std::vector<ThreadPoolTask> queue;

static int thread_count;

static int queue_size;

static int head;

// tail 指向尾节点的下一节点

static int tail;

static int count;

static int shutdown;

static int started;

static int threadpool_create(int _thread_count, int _queue_size);

static int threadpool_add(std::shared_ptr<void> args, std::function<void(std::shared_ptr<void>)> fun);

static int threadpool_destroy(ShutDownOption shutdown_option = graceful_shutdown);

static int threadpool_free();

static void *threadpool_thread(void *args);