Re: Crash during manual log cache update

Hello,

Am 11.05.2010 19:25, schrieb Stefan Küng:
> I've disabled the possibility to update multiple caches at once some
> time ago on trunk. That takes care of the crash :)

Sorry for the late answer, but I was waiting for a nightly to contain
the fix, but so far I couldn't find one, at least not on the
subversion-1.6.x line, and I don't want to risk my working copies being
upgraded to 1.7. I have tested 1.6.99, Build 19540 64bit.

So I digged some further into this and I think the bug is actually *not*
completely fixed :) That's also why I couldn't find it fixed on trunk,
because I intuitively used a "workaround" for the fix. But read on.

It's correct that in r17700 from Nov 2009 you introduced some measures
to disable the "Update" button while an update is running. See diff:

http://code.google.com/p/tortoisesvn/source/diff?spec=svn19621&r=17700&format=side&path=/trunk/src/TortoiseProc/Settings/SettingsLogCaches.cpp

The important part clearly is:

253 InterlockedExchange(&dialog->m_bThreadRunning, TRUE);
257 dialog->DialogEnableWindow(IDC_CACHEUPDATE, false);
        [...]
316 dialog->DialogEnableWindow(IDC_CACHEUPDATE, true);
318 InterlockedExchange(&dialog->m_bThreadRunning, FALSE);

However, if one changes the selection in the list view while an update
is running (which is possible because the update window is not modal),
the following code gets active, actually re-enabling the "Update" button:

323 UINT count = m_cRepositoryList.GetSelectedCount();
325 GetDlgItem(IDC_CACHEUPDATE)->EnableWindow(count == 1);

I guess this should be changed to:

325 GetDlgItem(IDC_CACHEUPDATE)->
                EnableWindow(!m_bThreadRunning && count == 1);

(assuming there are no synchronization mechanisms needed to access
m_bThreadRunning).

We should probably also avoid any items from being deleted or looked up
details upon while the update is running, which is why all lines 331-334
should be updated with the additional check.

Do you agree?

-- 
Best regards,
Michael 'Sidewinder' Geisinger
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