+(defsubst progress-reporter-update (reporter value)
+ "Report progress of an operation in the echo area.
+However, if the change since last echo area update is too small
+or not enough time has passed, then do nothing (see
+`make-progress-reporter' for details).
+
+First parameter, REPORTER, should be the result of a call to
+`make-progress-reporter'. Second, VALUE, determines the actual
+progress of operation; it must be between MIN-VALUE and MAX-VALUE
+as passed to `make-progress-reporter'.
+
+This function is very inexpensive, you may not bother how often
+you call it."
+ (when (>= value (car reporter))
+ (progress-reporter-do-update reporter value)))
+