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: 
An object does not exist if its constructor does not finish. So putting a while(1) loop in a constructor will prevent objects being created using that constructor. You need to describe what problem you think doing this will solve.
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> Is it recommed to put a while loop, which never ends in a constructor?
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> 
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No.

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> Or should I use threads to get the same result?
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> 
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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?