src/atimer.h

   1 /* Asynchronous timers.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef EMACS_ATIMER_H
  22 #define EMACS_ATIMER_H
  23
  24 /* Declare the prototype for a general external function.  */
  25 #if defined (PROTOTYPES) || defined (WINDOWSNT)
  26 #define P_(proto) proto
  27 #else
  28 #define P_(proto) ()
  29 #endif
  30
  31 #include "systime.h"            /* for EMACS_TIME */
  32
  33 /* Forward declaration.  */
  34
  35 struct atimer;
  36
  37 /* Types of timers.  */
  38
  39 enum atimer_type
  40 {
  41   /* Timer is ripe at some absolute time.  */
  42   ATIMER_ABSOLUTE,
  43
  44   /* Timer is ripe at now plus an offset.  */
  45   ATIMER_RELATIVE,
  46
  47   /* Timer runs continously.  */
  48   ATIMER_CONTINUOUS
  49 };
  50
  51 /* Type of timer callback functions.  */
  52
  53 typedef void (* atimer_callback) P_ ((struct atimer *timer));
  54
  55 /* Structure describing an asynchronous timer.  */
  56
  57 struct atimer
  58 {
  59   /* The type of this timer.  */
  60   enum atimer_type type;
  61
  62   /* Time when this timer is ripe.  */
  63   EMACS_TIME expiration;
  64
  65   /* Interval of this timer.  */
  66   EMACS_TIME interval;
  67
  68   /* Function to call when timer is ripe.  Interrupt input is
  69      guaranteed to not be blocked when this function is called.  */
  70   atimer_callback fn;
  71
  72   /* Additional user-specified data to pass to FN.  */
  73   void *client_data;
  74
  75   /* Next in list of active or free atimers.  */
  76   struct atimer *next;
  77 };
  78
  79 /* Function prototypes.  */
  80
  81 struct atimer *start_atimer P_ ((enum atimer_type, EMACS_TIME,
  82                                  atimer_callback, void *));
  83 void cancel_atimer P_ ((struct atimer *));
  84 void do_pending_atimers P_ ((void));
  85 void init_atimer P_ ((void));
  86 void turn_on_atimers P_ ((int));
  87 void stop_other_atimers P_ ((struct atimer *));
  88 void run_all_atimers P_ ((void));
  89 Lisp_Object unwind_stop_other_atimers P_ ((Lisp_Object));
  90
  91 #endif /* EMACS_ATIMER_H */
  92
  93 /* arch-tag: 02c7c1c8-45bd-4222-b874-4ca44662f60b
  94    (do not change this comment) */