If this was broken I think a lot of things would break. > On Nov 30, 2019, at 1:56 PM, Liam <networkimp...@gmail.com> wrote: > > > The stress test for my app fails frequently with what looks like a collision > in atomic.AddUint64() results, so I wondered whether I had misunderstood > atomic-add. > > So far I can't reproduce it with a small program, so I've probably > misunderstood my app :-) > >> On Friday, November 29, 2019 at 6:41:39 PM UTC-8, Kurtis Rader wrote: >>> On Fri, Nov 29, 2019 at 6:21 PM Liam <networ...@gmail.com> wrote: >> >>> Does atomic.AddInt32(&x, 1) always yield unique values for concurrent >>> callers? >>> >>> I'm guessing not, because (I think) I'm seeing that two callers get x+2, >>> neither gets x+1. >> >> That shouldn't happen, AFAICT. Can you share the code where the incorrect >> behavior is occurring? Or, preferably, a simple reproducer program? >> >>> Is there a way to generate unique values with pkg atomic, or is a mutex >>> required? >> >> Keep in mind that atomic.AddInt32() has the usual two's-complement overflow >> semantics. If all you want is a generation counter you really should be >> using a uint32 and atomic.AddUint32(). Also, depending on your preferences >> and performance considerations you might find it preferable to use a channel >> that holds a single int, or small number of ints, that is fed by a producer >> goroutine and consumed by any context needing a uniq ID. That makes it >> easier to abstract the generation of "unique" ints so that they satisfy >> other constraints (e.g., they must be even, odd, prime, etc.). >> >> -- >> Kurtis Rader >> Caretaker of the exceptional canines Junior and Hank > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/4f62dfff-6895-4aaa-9f0d-b635d5ba7ea7%40googlegroups.com.
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