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lorife

Italy
44 Posts

Posted - Mar 08 2023 :  03:25:39  Show Profile  Reply
Hello,
I have 2 threads which runs at the same time every x minutes.
Every now and then both processes just stop.
After many test I think have managed to find where it happens.
It seems it happens when I create the components. In fact each thread does this:

TmpDM    := TDataModule.Create(AOwner);
iev_IN   := TImageEnView.Create(tmpDM);
iev_IN2  := TImageEnView.Create(tmpDM);
iemv_OUT := TImageEnMView.Create(tmpDM);


I have managed to solve it by doing this:

ImageEN_Lock1.Acquire;

TmpDM    := TDataModule.Create(AOwner);
iev_IN   := TImageEnView.Create(tmpDM);
iev_IN2  := TImageEnView.Create(tmpDM);
iemv_OUT := TImageEnMView.Create(tmpDM);

ImageEN_Lock1.Release;


However I am not sure why it happens.
Could you help me?
To test it, I created 2 threads which runs every second. After 2-3 minutes it happens.

Thank you.

xequte

38162 Posts

Posted - Mar 08 2023 :  19:04:43  Show Profile  Reply
Hi

Are you able to create a very simple demo that shows the issue?

Nigel
Xequte Software
www.imageen.com
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MaribelSpence

USA
1 Posts

Posted - Mar 09 2023 :  05:15:19  Show Profile  Reply
For a deeper understanding of multithreading and resource recovery in Delphi, I suggest studying the documentation on TMultiReadExclusiveWriteSynchronizer, TThread, TMonitor and other multithreaded classes in Delphi.
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lorife

Italy
44 Posts

Posted - Mar 10 2023 :  01:55:09  Show Profile  Reply
I will try and send it to you
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JonMRobertson

USA
19 Posts

Posted - Aug 24 2023 :  21:13:27  Show Profile  Reply
 
To test it, I created 2 threads which runs every second. After 2-3 minutes it happens.
Out of curiosity, how long are the components kept alive before you free them? Are you freeing them in the same thread that created them?
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