Re: 'file changed'-event

Michael Goerz <news2132@xxxxxxxxxxxxxxx> wrote in comp.lang.perl.misc:
> Hi,
>
> I'm trying to execute a sub whenever a certain file on the disk changes.
> Currently, I'm doing this with an infinite loop that checks the modify
> time (stat("$file"))[9]. While this works in principle, the infinite
> loop drives the CPU crazy and speeds up the fan (very annoying).
>
> Can I implement this with an event-based approach that doesn't drive up
> my CPU? How?

Unless your file system supports events you'll ultimately have to watch
the file. However, doing so in a tight loop is useless. Presumably the
file system's resolution is one second, so you should only stat the file
once a second. If you don't need maximum resolution make the intervals as
long as reasonable. That will make the load tolerable.

Anno
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