The mechanism described in this chapter is only operative when the Lisp process
is actually running inside of Hemlock, within the ed function. The
designers intended its use to be associated with the editor, such as with
auto-saving files, reminding the user, etc.
&optional repeat ¶This causes Hemlock to call function after time seconds have passed,
optionally repeating every time seconds. Repeat defaults to t.
This is a rough mechanism since commands can take an arbitrary amount of time
to run; Hemlock invokes function at the first possible moment after
time has elapsed. Function takes the time in seconds that has elapsed
since the last time it was called (or since it was scheduled for the first
invocation).
This removes function from the scheduling queue. Function does not have to be in the queue.