1 ;;; run-at-time.el --- A non-buggy version of the run-at-time function
3 ;; Copyright (C) 1999, 2000, 2003 Free Software Foundation, Inc.
5 ;; Author: Katsumi Yamaoka <yamaoka@jpl.org>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
26 ;; XEmacs has a buggy version of run-at-time. This file defines a
27 ;; non-buggy version of the same.
31 (if (condition-case nil
33 (unless (or itimer-process itimer-timer)
34 (itimer-driver-start))
35 ;; Check whether there is a bug to which the difference of
36 ;; the present time and the time when the itimer driver was
37 ;; woken up is subtracted from the initial itimer value.
38 (let* ((inhibit-quit t)
39 (ctime (current-time))
40 (itimer-timer-last-wakeup
43 (setcar ctime (1- (car ctime)))))
45 (itimer (start-itimer "run-at-time" 'ignore 5)))
46 (sleep-for 0.1) ;; Accept the timeout interrupt.
48 (> (itimer-value itimer) 0)
49 (delete-itimer itimer))))
51 (lambda (time repeat function &rest args)
52 "Function emulating the function of the same name of Emacs.
53 TIME should be nil meaning now, or a number of seconds from now.
54 Return an itimer object which can be used in either `delete-itimer'
56 (apply #'start-itimer "run-at-time"
57 function (if time (max time 1e-9) 1e-9)
59 (lambda (time repeat function &rest args)
60 "Function emulating the function of the same name of Emacs.
61 It works correctly for TIME even if there is a bug in the XEmacs core.
62 TIME should be nil meaning now, or a number of seconds from now.
63 Return an itimer object which can be used in either `delete-itimer'
65 (let ((itimers (list nil)))
68 (apply #'start-itimer "fixed-run-at-time"
69 (lambda (itimers repeat function &rest args)
70 (let ((itimer (car itimers)))
75 (lambda (itimer repeat function &rest args)
76 (set-itimer-restart itimer repeat)
77 (set-itimer-function itimer function)
78 (set-itimer-function-arguments itimer args)
79 (apply function args)))
80 (set-itimer-function-arguments
82 (append (list itimer repeat function) args)))
85 (lambda (itimer function &rest args)
86 (delete-itimer itimer)
87 (apply function args)))
88 (set-itimer-function-arguments
90 (append (list itimer function) args)))))
91 1e-9 (if time (max time 1e-9) 1e-9)
92 nil t itimers repeat function args))))))
94 (provide 'run-at-time)
96 ;;; run-at-time.el ends here