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Document 'timerp'

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* doc/lispref/os.texi (Timers): Document 'timerp'.  (Bug#24511)
Improve indexing.
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Eli Zaretskii 2016-09-23 11:43:25 +03:00
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commit 0ae9a816b9
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doc/lispref/os.texi
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@ -1727,10 +1727,17 @@ This function returns @code{t} if @var{year} is a leap year.
@node Timers
@section Timers for Delayed Execution
@cindex timer
@cindex timers
You can set up a @dfn{timer} to call a function at a specified
future time or after a certain length of idleness.
future time or after a certain length of idleness. A timer is a
special object that stores the information about the next invocation
times and the function to invoke.
@defun timerp object
This predicate function returns non-@code{nil} of @code{object} is a
timer.
@end defun
Emacs cannot run timers at any arbitrary point in a Lisp program; it
can run them only when Emacs could accept output from a subprocess: