Qt-interest Archive, December 2007
Race conditions on QTextDocument
Message 1 in thread
I'm using QTextCursor and QTextBlock classes to concurrently modify the
same QTextDocument in different threads. I'm very worried about my
setup, because I'm missing basic information about how synchronization
should work for concurrent access to a QTextDocument. For instance I do
have a GUI thread, which likes to cut off some text, which is just
currently processed by a background thread using a QTextCursor. What
happens to this QTextCursor object? Are readers locked out, while
someone is writing (and vise-versa)? And if so, when does a read
operation start -- at construction time of a QTextCursor?
Thanks in advance,
Frank.
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Message 2 in thread
Frank Mertens wrote:
> I'm using QTextCursor and QTextBlock classes to concurrently modify
> the same QTextDocument in different threads. I'm very worried about my
> setup, because I'm missing basic information about how synchronization
> should work for concurrent access to a QTextDocument. For instance I
> do have a GUI thread, which likes to cut off some text, which is just
> currently processed by a background thread using a QTextCursor. What
> happens to this QTextCursor object? Are readers locked out, while
> someone is writing (and vise-versa)? And if so, when does a read
> operation start -- at construction time of a QTextCursor?
>
> Thanks in advance,
> Frank.
>
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OK, figured out, that QTextDocument has no undocumented internal
synchronization I would need to worry about (nice to have the code
OpenSource;). Also simply forget about how to lock up the GUI thread
after being some months out of Qt coding. Nice to have this signal-slots
work across threads by the means of the event loops -- so it's quite
obvious how to lock the GUI thread in an ordered way.
Cheers, Frank.
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