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    <p>You should only access VCL objects from main VCL thread. </p> <p>Some reading methods (property getters) do work from other threads in practice - but you have to prove it in advance reading VCL sources for the specific Delphi build. Or not use it.</p> <p>PS: Synchronize method runs given procedure in main VCL thread, pausing the caller thread, which may lead to a deadlock, if main thread was also blocked.</p> <p>Read more: (actually making this answer to list some links)</p> <ul> <li><a href="http://www.michael-puff.de/Programmierung/Delphi/Code-Snippets/VCLThreadDemo.shtml" rel="nofollow noreferrer">http://www.michael-puff.de/Programmierung/Delphi/Code-Snippets/VCLThreadDemo.shtml</a></li> <li><a href="http://www.drbob42.com/uk-bug/hood-04.htm" rel="nofollow noreferrer">http://www.drbob42.com/uk-bug/hood-04.htm</a></li> <li><a href="http://delphi.about.com/od/kbthread/a/thread-gui.htm" rel="nofollow noreferrer">http://delphi.about.com/od/kbthread/a/thread-gui.htm</a></li> <li><a href="https://stackoverflow.com/questions/1806339/">Is it better to use TThread&#39;s &quot;Synchronize&quot; or use Window Messages for IPC between main and child thread?</a></li> <li><a href="https://stackoverflow.com/questions/3331622/">Delphi 6 : breakpoint triggered on non-VCL thread stops main thread repaints</a></li> <li><a href="http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/devwin32/win32_mthreadusemainthread_xml.html" rel="nofollow noreferrer">http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/devwin32/win32_mthreadusemainthread_xml.html</a></li> <li><a href="https://stackoverflow.com/questions/16780581/">Simplifying VCL thread wrapper code</a></li> <li><a href="https://stackoverflow.com/questions/6739595/">Update a VCL component from CreateAnonymousThread</a></li> <li><a href="http://thaddy.co.uk/threads/" rel="nofollow noreferrer">http://thaddy.co.uk/threads/</a> - the mirror of "Multithreading - The Delphi Way" by Martin Harvey</li> <li><a href="http://otl.17slon.com/" rel="nofollow noreferrer">http://otl.17slon.com/</a> - new Delphi approach to threading</li> </ul>
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    1. POThread-safe in delphi
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    1. COGood list! "Multithreading - The Delphi Way" by Martin Harvey should be up there as well. In my opinion at the top position :-D Unfortunately the [original](http://www.pergolesi.demon.co.uk/prog/threads/ToC.html) is no longer around but there are several "cached" copies around: [Thaddy's](http://thaddy.co.uk/threads/) and [http://web.archive.org/](http://web.archive.org/web/20060305174604/http://www.pergolesi.demon.co.uk/prog/threads/ToC.html) are the ones I know about. It is also available through [Code Central](http://cc.embarcadero.com/item/14809).
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      1. USMarjan Venema
    2. CO@MarjanVenema okay. Your link is rather valueable cause actually this list of mine is just 5 minutes of googling, and your links requires prior knowledge.
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