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List:       kde-devel
Subject:    Re: KDE, Qt3 and Amarok
From:       Thiago Macieira <thiago () kde ! org>
Date:       2008-04-21 8:21:31
Message-ID: 200804211021.31633.thiago () kde ! org
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Bart Van Assche wrote:
>>  The program is wrong.
>>
>>  Qt 3 *requires* you to make a deep copy of the QString using
>> QDeepCopy (see http://doc.trolltech.com/3.3/qdeepcopy.html) before
>> passing it to another thread.
>>
>>  That's what Amarok is failing to do.
>
>Below you can find another sample program. When compiled and linked
>against Qt3, it triggers data races. When compiled and linked against
>Qt4, the program does not trigger any data races. Is the program OK or
>not ?

The program is still wrong. You did not read what I said: you MUST use 
QDeepCopy in Qt 3.

And that class does not exist in Qt 4.

>In case it wouldn't be immediately clear why the program triggers data
>races with Qt3: this is because Qt3 implements empty strings via the
>shared_null object, which is also reference counted.


-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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