[sane-devel] sanei_thread: pthread test on linux possible?

[Oliver Rauch]

On Monday 12 January 2004 19:47, Henning Meier-Geinitz wrote:
> Hi,
>
> On Mon, Jan 12, 2004 at 07:34:27PM +0100, Oliver Rauch wrote:
> > In the umax backend (forked reader process) I used a
> > signal handler that catches sigkill and calls
> > sanei_scsi_req_flush_all();
> > when the reader_process is killed. I am not sure if this
> > is necessary but I think I did not add this just because of fun.
> > Any ideas?
>
> Try it and you may hang your SCSI system :-)
> At least if you use multiple SCSI request at the same time a call to
> sanei_scsi_req_flush_all() is necessary. Bu you can do that from the
> main process, too.

When I do not call sanei_scsi_req_flush_all();
when the reader process is killed then sanei_scsi crashes
when the main process/thread tries to talk to the scanner
the next time.

When the process is killed because of sane_cancel or do_cancel
is called there is no problem, I can call sanei_scsi_req_flush_all();
in do_cancel.

The question is what happens when the SIGKILL was not generated in do_cancel,
e.g. because a user executed a kill command for the reader_process or because 
of a malfunction.

Oliver

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