Question: Is it recommed to put a while loop, which never ends in a constructor? Or should I use threads to get the same result?
Is it good when a constructor never terminates? Or is it more secure to avoid segmentation faults?

Hope you understand my bad English..

Answer: 
> 
> Is it recommed to put a while loop, which never ends in a constructor?
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> 
> 

No.

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> Or should I use threads to get the same result?
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No.

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> Is it good when a constructor never terminates?
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> 
> 

No.

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> Or is it more secure to avoid segmentation faults?
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> 
> 

No.

What problem are you trying to solve?
Your code shouldn't generate a segmentation fault whether or not it uses multiple threads or contains infinite loops.

None of those have anything to do with segmentation faults. If those occur, you need to fix that problem