[Emacs-diffs] Changes to emacs/lispref/os.texi,v

[Chong Yidong]

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Chong Yidong <cyd>      06/08/25 02:58:08

Index: os.texi
===================================================================
RCS file: /sources/emacs/emacs/lispref/os.texi,v
retrieving revision 1.91
retrieving revision 1.92
diff -u -b -r1.91 -r1.92
--- os.texi     20 Aug 2006 20:57:26 -0000      1.91
+++ os.texi     25 Aug 2006 02:58:08 -0000      1.92
@@ -1394,6 +1394,13 @@
 changes from user commands' changes and prevent a single undo entry
 from growing to be quite large.
 
+  Timer functions should also avoid calling functions that cause Emacs
+to wait, such as @code{sit-for} (@pxref{Waiting}).  This can lead to
+unpredictable effects, since other timers (or even the same timer) can
+run while waiting.  If a timer function needs to perform an action
+after a certain time has elapsed, it can do this by scheduling a new
+timer.
+
   If a timer function calls functions that can change the match data,
 it should save and restore the match data.  @xref{Saving Match Data}.