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diff --git a/src/atimer.h b/src/atimer.h
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+++ b/src/atimer.h
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+/* Asynchronous timers.
+   Copyright (C) 2000 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 2, 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; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* 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.  Interupt input is
+     garanteed 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));
+