Qt-interest Archive, October 2006
Re: QAbstractItemModel lockup during removeRows
Message 1 in thread
Are you able to make a small test application that can cause this crash?
-Benjamin Meyer
On Friday 22 September 2006 18:35, Tobias Rundström wrote:
> Hello,
>
> I have this very strange problem with my AbstractItemModel, it seems
> to (under heavy load) lock up and kill the whole application. The
> backtrace is visible here:
>
> Program received signal SIGTSTP, Stopped (user).
> 0x02c25f4b in QAbstractItemModelPrivate::rowsAboutToBeRemoved ()
> (gdb) bt
> #0 0x02c25f4b in QAbstractItemModelPrivate::rowsAboutToBeRemoved ()
> #1 0x02c2618b in QAbstractItemModel::beginRemoveRows ()
> #2 0x00022a29 in PlaylistModel::handle_change (this=0x2e44d40,
> chg=@0x2e9b720) at playlistmodel.cpp:99
>
> (whole backtrace at: http://30cc58de1e452665.paste.se/)
>
> the relevant code snipplet:
>
> bool
> PlaylistModel::handle_change (const Xmms::Dict &chg)
> {
> int32_t change = chg.get<int32_t> ("type");
> int32_t pos = 0, npos = 0;
> uint32_t id = 0;
> try {
> pos = chg.get<int32_t> ("position");
> id = chg.get<uint32_t> ("id");
> } catch (Xmms::no_such_key_error) {
> }
>
> QModelIndex idx = QModelIndex ();
>
> switch (change) {
> case XMMS_PLAYLIST_CHANGED_ADD:
> beginInsertRows (idx, pos, pos);
> m_plist.append (id);
> endInsertRows ();
> break;
> case XMMS_PLAYLIST_CHANGED_INSERT:
> beginInsertRows (idx, pos, pos);
> m_plist.insert (pos, id);
> endInsertRows ();
> break;
> case XMMS_PLAYLIST_CHANGED_MOVE:
> beginRemoveRows (idx, pos, pos);
> m_plist.removeAt (pos);
> endRemoveRows ();
>
> npos = chg.get<uint32_t> ("newposition");
> beginInsertRows (idx, npos, npos);
> m_plist.insert (npos, id);
> endInsertRows ();
> break;
> case XMMS_PLAYLIST_CHANGED_REMOVE:
> beginRemoveRows (idx, pos, pos);
> m_plist.removeAt (pos);
> endRemoveRows ();
> break;
> case XMMS_PLAYLIST_CHANGED_SHUFFLE:
> case XMMS_PLAYLIST_CHANGED_SORT:
> case XMMS_PLAYLIST_CHANGED_CLEAR:
> m_client->playlist.list (Xmms::bind (&PlaylistModel::handle_list,
> this));
> break;
> }
>
> return true;
> }
>
> it only happens in CHANGED_REMOVE case above.
>
> I am doing anything wrong with my model or could this be a bug in Qt
> (4.1.4 btw).
>
> Thanks
> Tobias
>
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