libuv(不断更新)

/*
 * Initialize the uv_async_t handle. A NULL callback is allowed.
 *
 * Note that uv_async_init(), unlike other libuv functions, immediately
 * starts the handle. To stop the handle again, close it with uv_close().
 */
UV_EXTERN int uv_async_init(uv_loop_t*,
                            uv_async_t* async,
                            uv_async_cb async_cb);