/* Asynchronous timers.
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005,
                 2006, 2007, 2008  Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef EMACS_ATIMER_H
#define EMACS_ATIMER_H

/* Declare the prototype for a general external function.  */
#if defined (PROTOTYPES) || defined (WINDOWSNT)
#define P_(proto) proto
#else
#define P_(proto) ()
#endif

#include "systime.h"		/* for EMACS_TIME */

/* Forward declaration.  */

struct atimer;

/* Types of timers.  */

enum atimer_type
{
  /* Timer is ripe at some absolute time.  */
  ATIMER_ABSOLUTE,

  /* Timer is ripe at now plus an offset.  */
  ATIMER_RELATIVE,

  /* Timer runs continously.  */
  ATIMER_CONTINUOUS
};

/* Type of timer callback functions.  */

typedef void (* atimer_callback) P_ ((struct atimer *timer));

/* Structure describing an asynchronous timer.  */

struct atimer
{
  /* The type of this timer.  */
  enum atimer_type type;

  /* Time when this timer is ripe.  */
  EMACS_TIME expiration;

  /* Interval of this timer.  */
  EMACS_TIME interval;

  /* Function to call when timer is ripe.  Interrupt input is
     guaranteed to not be blocked when this function is called.  */
  atimer_callback fn;

  /* Additional user-specified data to pass to FN.  */
  void *client_data;

  /* Next in list of active or free atimers.  */
  struct atimer *next;
};

/* Function prototypes.  */

struct atimer *start_atimer P_ ((enum atimer_type, EMACS_TIME,
				 atimer_callback, void *));
void cancel_atimer P_ ((struct atimer *));
void do_pending_atimers P_ ((void));
void init_atimer P_ ((void));
void turn_on_atimers P_ ((int));
void stop_other_atimers P_ ((struct atimer *));
void run_all_atimers P_ ((void));
Lisp_Object unwind_stop_other_atimers P_ ((Lisp_Object));

#endif /* EMACS_ATIMER_H */

/* arch-tag: 02c7c1c8-45bd-4222-b874-4ca44662f60b
   (do not change this comment) */
