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while ($keepOnWatching) {
 $inotify->watch($watchpoint,IN_ALL_EVENTS);
...
 # undef $inotify
 processEvents(@events);
}

 $inotify->watch($watchpoint,IN_ALL_EVENTS);
while ($keepOnWatching) {
 @events=$inotify->read;# sleep, and wake when events arrive
 processEvents(@events);
}