text: #define DEFINE_CALLBACK(WATCHER_LC, WATCHER_TYPE) \
      static void gevent_callback_##WATCHER_LC(struct ev_loop *, void *, int);
  
  
  #define DEFINE_CALLBACKS0              \
      DEFINE_CALLBACK(io, IO);           \
      DEFINE_CALLBACK(timer, Timer);     \
      DEFINE_CALLBACK(signal, Signal);   \
      DEFINE_CALLBACK(idle, Idle);       \
      DEFINE_CALLBACK(prepare, Prepare); \
      DEFINE_CALLBACK(check, Check);     \
      DEFINE_CALLBACK(fork, Fork);       \
      DEFINE_CALLBACK(async, Async);     \
      DEFINE_CALLBACK(stat, Stat);
  
  
  #ifndef _WIN32
  
  #define DEFINE_CALLBACKS               \
      DEFINE_CALLBACKS0                  \
      DEFINE_CALLBACK(child, Child)
  
  #else
  
  #define DEFINE_CALLBACKS DEFINE_CALLBACKS0
  
  #endif
  
  
  DEFINE_CALLBACKS
  
  
  static void gevent_run_callbacks(struct ev_loop *, void *, int);
  struct PyGeventLoopObject;
  static void gevent_handle_error(struct PyGeventLoopObject* loop, PyObject* context);
  struct PyGeventCallbackObject;
  static void gevent_call(struct PyGeventLoopObject* loop, struct PyGeventCallbackObject* cb);
  
  #if defined(_WIN32)
  static void gevent_periodic_signal_check(struct ev_loop *, void *, int);
  #endif
  
  static void gevent_noop(struct ev_loop *_loop, void *watcher, int revents) { }
  