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PromptOK in a thread. Bug? [message #26749]

Tue, 25 May 2010 17:49

whiteman
Messages: 11
Registered: May 2009

Promising Member

If I launch a

PromptOK("Hello");

from a thread my program doesn't continue to work (like a blocked mutex), no crash.

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Re: PromptOK in a thread. Bug? [message #26752 is a reply to message #26749]

Tue, 25 May 2010 20:36

koldo
Messages: 3461
Registered: August 2008

Senior Veteran

Hello whiteman

I do not remember why but Mirek advised us to use user interface only in main thread.

Best regards
Iñaki

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Re: PromptOK in a thread. Bug? [message #26753 is a reply to message #26749]

Tue, 25 May 2010 21:05

dolik.rce
Messages: 1796
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi whiteman,

Do you use GuiLock when calling that PromptOK? It is necessary if you want to access the GUI directly from other threads.

See reference/GuiLock and reference/GuiMT...

Honza

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Re: PromptOK in a thread. Bug? [message #26759 is a reply to message #26752]

Wed, 26 May 2010 13:25

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

koldo wrote on Tue, 25 May 2010 14:36

Hello whiteman

I do not remember why but Mirek advised us to use user interface only in main thread.

Actually, that has changed with GuiLock. So the only thing concerning the main thread now is the fact that you do not need to use GuiLock there Smile

Hard to say why in this case it fails. A testcase and more info about host OS would be helpful.

Also, please check whether reference/GuiLock works for you (it creates Prompts inside thread).

Thinking about it, there is one important thing to know: All GUI processing is performed in the main thread. So if you invokde PromptOK from another thred, the request is passed to the main thread to be actually executed - in a very similar way to GUI input events. So if your main thread is busy doing things (think infinite loop), Prompt request will never be processed and things will look blocked.

[Updated on: Wed, 26 May 2010 13:32]

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Re: PromptOK in a thread. Bug? [message #26762 is a reply to message #26759]

Wed, 26 May 2010 13:54

whiteman
Messages: 11
Registered: May 2009

Promising Member

Ok, thanks to all of you!

[Updated on: Wed, 26 May 2010 13:57]

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