#ifndef _DELAYED_CALL_H
  #define _DELAYED_CALL_H
  
  /*
   * Poor man's closures; I wish we could've done them sanely polymorphic,
   * but...
   */
  
  struct delayed_call {
  	void (*fn)(void *);
  	void *arg;
  };
  
  #define DEFINE_DELAYED_CALL(name) struct delayed_call name = {NULL, NULL}
  
  /* I really wish we had closures with sane typechecking... */
  static inline void set_delayed_call(struct delayed_call *call,
  		void (*fn)(void *), void *arg)
  {
  	call->fn = fn;
  	call->arg = arg;
  }
  
  static inline void do_delayed_call(struct delayed_call *call)
  {
  	if (call->fn)
  		call->fn(call->arg);
  }
  
  static inline void clear_delayed_call(struct delayed_call *call)
  {
  	call->fn = NULL;
  }
  #endif