Re: TCriticalSection between 2 threads

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#2772

From: Eelke
Date: Tue, 28 Nov 2006 11:24

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Boba wrote:
> "Eelke" <e.klein@remove.mplussoftware.nl> wrote in message
> news:456c0cd1@newsgroups.borland.com...
>> ...
>> Actually for trivial data like a single integer no critical section is
>> needed because the assignment of an int is an atomic operation.
> 
> and what do you call an 'atomic operation' ?
> 
> 
An atomic operation is an operation which is executed completely before 
another thread can see the result of the operation. For instance the 
assignment of an int is atomic because the CPU changes all 32-bits at 
the same time so another thread sees either the old value or the new but 
never some combination.

This is only true when the data is properly aligned.

Eelke

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