Import Gnus v5.10.3.

[elisp/gnus.git-] / lisp / nnheaderxm.el

diff --git a/lisp/nnheaderxm.el b/lisp/nnheaderxm.el
index 972067b..5b6805a 100644 (file)
--- a/lisp/nnheaderxm.el
+++ b/lisp/nnheaderxm.el
@@ -1,6 +1,6 @@
 ;;; nnheaderxm.el --- making Gnus backends work under XEmacs
 
-;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001
+;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003
 ;;      Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
@@ -27,12 +27,67 @@
 
 ;;; Code:
 
-(defun nnheader-xmas-run-at-time (time repeat function &rest args)
-  (start-itimer
-   "nnheader-run-at-time"
-   `(lambda ()
-      (,function ,@args))
-   time repeat))
+(if (condition-case nil
+       (progn
+         (unless (or itimer-process itimer-timer)
+           (itimer-driver-start))
+         ;; Check whether there is a bug to which the difference of
+         ;; the present time and the time when the itimer driver was
+         ;; woken up is subtracted from the initial itimer value.
+         (let* ((inhibit-quit t)
+                (ctime (current-time))
+                (itimer-timer-last-wakeup
+                 (prog1
+                     ctime
+                   (setcar ctime (1- (car ctime)))))
+                (itimer-list nil)
+                (itimer (start-itimer "nnheader-run-at-time" 'ignore 5)))
+           (sleep-for 0.1) ;; Accept the timeout interrupt.
+           (prog1
+               (> (itimer-value itimer) 0)
+             (delete-itimer itimer))))
+      (error nil))
+    (defun nnheader-xmas-run-at-time (time repeat function &rest args)
+      "Emulating function run as `run-at-time'.
+TIME should be nil meaning now, or a number of seconds from now.
+Return an itimer object which can be used in either `delete-itimer'
+or `cancel-timer'."
+      (apply #'start-itimer "nnheader-run-at-time"
+            function (if time (max time 1e-9) 1e-9)
+            repeat nil t args))
+  (defun nnheader-xmas-run-at-time (time repeat function &rest args)
+    "Emulating function run as `run-at-time' in the right way.
+TIME should be nil meaning now, or a number of seconds from now.
+Return an itimer object which can be used in either `delete-itimer'
+or `cancel-timer'."
+    (let ((itimers (list nil)))
+      (setcar
+       itimers
+       (apply #'start-itimer "nnheader-run-at-time"
+             (lambda (itimers repeat function &rest args)
+               (let ((itimer (car itimers)))
+                 (if repeat
+                     (progn
+                       (set-itimer-function
+                        itimer
+                        (lambda (itimer repeat function &rest args)
+                          (set-itimer-restart itimer repeat)
+                          (set-itimer-function itimer function)
+                          (set-itimer-function-arguments itimer args)
+                          (apply function args)))
+                       (set-itimer-function-arguments
+                        itimer
+                        (append (list itimer repeat function) args)))
+                   (set-itimer-function
+                    itimer
+                    (lambda (itimer function &rest args)
+                      (delete-itimer itimer)
+                      (apply function args)))
+                   (set-itimer-function-arguments
+                    itimer
+                    (append (list itimer function) args)))))
+             1e-9 (if time (max time 1e-9) 1e-9)
+             nil t itimers repeat function args)))))
 
 (defalias 'nnheader-run-at-time 'nnheader-xmas-run-at-time)
 (defalias 'nnheader-cancel-timer 'delete-itimer)