[Qt-interest] QFile* threads

[_h_]

Hi,
Can anybody explain, how following can be implemented in Qt...
- allow to stop QFile threads temporarily when the QFileDialog is
hidden and start them when QFileDialog shown again.

Thank you.

On Sat, Jul 25, 2009 at 2:06 AM, Malyushytsky, Alex<alex at wai.com> wrote:
> You got a good suggestion:
> "I'd suggest caching the QFileDialog info somewhere and when reopening one of them you'd just initialize it to the corresponding cache values."
>
> You  could store even location and size of the dialogs, so user would never even notice that a new instance was created.
> It is more efficient and elegant, than keeping all QFileDialog objects in the memory.
> Why would you not follow it?
>
> Regards,
>   Alex
>
>
>
> -----Original Message-----
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of _h_
> Sent: Friday, July 24, 2009 5:17 AM
> To: qt-interest at trolltech.com
> Subject: Re: [Qt-interest] QFile* threads
>
> Hi Thiago Macieira,
> Wouldn't it incure overhead?
> Is there any other alternative? Or is there any way Qt allows to stop
> the threads temporarily when the QFileDialog is hidden and start them
> when QFileDialog shown again ???
> I am not getting why threads are running when QFileDialog is hidden.
> Thank you.
>
> On Fri, Jul 24, 2009 at 5:21 PM, Thomas
> Dähling<t.daehling at googlemail.com> wrote:
>> I'd suggest caching the QFileDialog info somewhere and when reopening
>> one of them you'd just initialize it to the corresponding cache
>> values.
>>
>> 2009/7/24 _h_ <hiralsmaillist at gmail.com>:
>>> Hi Thiago Macieira,
>>> Thanks for information.
>>> Can you please suggest how can I reduce these many threads?
>>> My application uses more than 20 QFileDialog object pointers (why
>>> pointer? because I want to persist the directoy/file filters/file
>>> browsed info within that instance, so), and if I open and close all
>>> these file broswers one by one, then I can see about 20 threads
>>> running. So I wanted to reduce these many threads.
>>> Can you please suggest nice way to achieve this?
>>> Thank you.
>>>
>>>
>>>
>>> On Fri, Jul 24, 2009 at 4:50 PM, Thiago
>>> Macieira<thiago.macieira at trolltech.com> wrote:
>>>> Em Sexta-feira 24 Julho 2009, às 12:26:03, _h_ escreveu:
>>>>> Hi,
>>>>> In one of my qt application I am using multiple instance of
>>>>> QFileDialog by taking object pointer.
>>>>> When observing process stack of this application, it shows following...
>>>>>
>>>>> Thread 3 (Thread 183630768 (LWP 10648)):
>>>>> #0 0x008e348d in pthread_cond_wait@@GLIBC_2.3.2 ()
>>>>> #1 0x02a34178 in QWaitCondition::wait ()
>>>>> #2 0x06bbbced in QFileSystemModel::sort ()
>>>>> #3 0x02a335a0 in QThread::setPriority ()
>>>>> #4 0x008e0d78 in start_thread () from /lib/tls/libpthread.so.0
>>>>> #5 0x05e613fa in clone () from /lib/tls/libc.so.6
>>>>> Thread 2 (Thread 173140912 (LWP 10649)):
>>>>> #0 0x05e5a757 in ___newselect_nocancel () from /lib/tls/libc.so.6
>>>>> #1 0x02b55bbf in QEventDispatcherUNIX::select ()
>>>>> #2 0x02b56c50 in QEventDispatcherUNIXPrivate::doSelect ()
>>>>> #3 0x02b57117 in QEventDispatcherUNIX::processEvents ()
>>>>> #4 0x02b26b6d in QEventLoop::processEvents ()
>>>>> #5 0x02b26eed in QEventLoop::exec ()
>>>>> #6 0x02a30087 in QThread::exec ()
>>>>> #7 0x02b0b91e in QFSFileEngine::rmdir ()
>>>>> #8 0x02a335a0 in QThread::setPriority ()
>>>>> #9 0x008e0d78 in start_thread () from /lib/tls/libpthread.so.0
>>>>> #10 0x05e613fa in clone () from /lib/tls/libc.so.6
>>>>>
>>>>> Can you please let me know how can I stop these threads?
>>>>
>>>> Those threads are created by the QFileDialog -- more specifically, by
>>>> QFileSystemModel. You can't stop them.
>>>>
>>>> --
>>>> Thiago Macieira - thiago.macieira (AT) nokia.com
>>>>  Senior Product Manager - Nokia, Qt Software
>>>>     Sandakerveien 116, NO-0402 Oslo, Norway
>>>>
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