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? >
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