[sane-devel] Uninterrupted HP LaserJet M1005 Backend
couriousous at mandriva.org
Thu Jan 31 22:42:06 UTC 2008
> > If break scaning with signal 2, then see next:
> > 1. backend stalled into sane_cancel.get_data... - next step only
> > 'killall scanimage'
> Ok, this is because sane_cancel() is called from a signal handler. I've
> re-read the sane API documentation and the backend should handle that.
Here is a fix. I've re-re-read the sane API doc more carefully and
sane_cancel() can only initiate the canceling. So I use a flag to tell
sane_read() to cancel the scan.
I'm not completly happy with this solution since a race condition is possible
if sane_cancel() is called after the last test of sane_read().
Moreover if sane_cancel() is called synchronously between sane_start() and
sane_read(), the canceling will only be done at sane_close() call...
So, comments are really welcome !
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