[Lazarus] Synchronize problem in linux

[Mattias Gaertner]

On Wed, 25 May 2011 12:04:37 +0200
Giuliano Colla <giuliano.colla at fastwebnet.it> wrote:

> Mattias Gaertner ha scritto:
> > This might help:
> > http://wiki.lazarus.freepascal.org/Multithreaded_Application_Tutorial
> >
> > Mattias
> >
> >   
> I have a question related to this subject. Working with Borland's stuff 
> (Kylix) I stumbled into a problem, and I'd like to know if the same 
> applies also to Lazarus.
> 
> I had a multithread application with a thread which receives data 
> through a communication line. I thought it safe to use a TStringList, 
> which AFAIK is not a visual object.

Correct.

> The main thread would create the 
> StringList, the other thread would append strings to the list, and when 
> it was done, the main thread would perform the required processing. The 
> logic of the application itself made it sure that there was no conflict 
> whatsoever. 

Ok. This should work if you use TThread to create the thread. 

> It turned out that it didn't work at all, silently filling 
> with garbage the List, and I was forced to move all code related to the 
> StringList in the main thread, with a slight overhead which, IMO should 
> not have been necessary. I couldn't understand if it was a Kylix bug or 
> a feature.
> 
> How would Lazarus behave with respect to this scenario? The scheme I 
> described is expected to work?

Without more code I can only give the above link again.

Mattias