On 12/8/2015 11:25 AM, Dimitry Sibiryakov wrote:
> 08.12.2015 17:12, Jim Starkey wrote:
>> But I don't get the logic that saving 10 ns. is worth introducing a
>> bug.
>     Could you elaborate what bug you have on mind?
>
>>   I suppose there are cases where you want to set a bit and don't
>> care whether it was already set are diminishingly small -- and
>> insignificant.
>     IMHO, on contrary, it is quite common case when several threads want to 
> perform an
> operation but only is allowed to.
>     In this topic's example it is running a sweep process. When a thread want 
> to run it,
> there can be two cases:
> a) it is the first thread wanting to
> b) someone else is already running it
>
>     In first case, the thread atomically set the flag and proceed.
>     In second case, the thread atomically set the flag and abort.
>     Result in both cases is exactly the same: flag is set but only first 
> thread works.
>     What I'm missing?
>

Experience.

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