Re: Hotplug bug in Linux 2.4.21?

["Kevin P. Fleming" <kpfleming@cox.net>]

Adrien Beau wrote:

> * When two instances of the script are run at a few seconds interval,
>   the lockfile mechanism works fine (again, see for example June 17th),
>   but when three instances run at the same time, the mechanism fails
>   in an impossible manner (see the log entries starting on June 20th,
>   at 12:15pm for the first occurence of this, and see the entries at
>   12:55:55pm for an occurence with the timestamps printed in the logs).
> 

I suspect your problem is that you are using timestamps for this log checking, 
and the timestamp granularity is too coarse. When the USB core decides to 
generate hotplug events for all three interfaces of a device it just found, 
those three /sbin/hotplug invocations are going to happen very quickly, 
certainly within a small fraction of a second.

You'll need to find some other way of knowing when a lockfile exists and is 
stale... something that can handle more than one process that is started at 
identical times (or nearly so).



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