Re: Fwd: I would like to cancel archive creation

On June 19, 2004 09:59 am, Johnathan Burchill wrote:
> Hi Denis,
>
> I received this from a kdar user who asks whether it is possible to
> cancel a libdar operation. My first attempt will be to add the "dry-run"
> feature to the creation process. However, this is not a "quick" test of
> the backup, I think it takes a time comparable to the actual backup. Is
> this right?
>
> As far as interrupting the creation process, now that libdar is
> thread-safe, would there be a way to send it a "kill" signal, to get it
> to stop what it is doing? A couple of people have asked for this
> feature.

QT has a method for terminating a thread, but this warning comes with the 
documentation:

Warning: This function is dangerous, and its use is discouraged. The thread 
can be terminate at any point in its code path. Threads can be terminated 
while modifying data. There is no chance for the thread to cleanup after 
itself, unlock any held mutexes, etc. In short, use this function only if 
absolutely necessary. (from http://doc.trolltech.com/3.3/qthread.html)

For the command line dar, a <Ctrl>-C will interrupt the libdar operation. 
I'm guessing that the terminate method is the equivalent for the QT GUI 
version. In dar-2.1.3, the library is not thread safe, so I only run one 
operation at a time, and killing the operation shouldn't be problematic as 
there are no locked mutexes. This should be like hitting <Ctrl>-C.
But the new threadsafe library may have issues with this technique.

Any comments?

Cheers,
JB

[...]

-- 
Johnathan K. Burchill, Ph.D.
[email protected]

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