is it atomic for writing a struct to same global memory location in CUDA?

Question

for example:

struct Point
{
    int x,
    int y;
};

If all threads write their own Point into the same location in global memory in the same time, is it possible that the final result Point in that location has x value of thread A and y value of thread B?

This question is closely related to Concurrent writes in the same global memory location and Is global memory write considered atomic in CUDA?

@RobertCrovella: There you go. – Lightness Races in Orbit Mar 17 '15 at 14:41 — Lightness Races in Orbit, Mar 17 '15 at 14:41

score 1 · Accepted Answer · answered Mar 17 '15 at 14:40

^{[This answer was copied from a comment that should have been an answer.]}

Is it possible that the final result Point in that location has x value of thread A and y value of thread B?

Yes. To avoid such a scenario you need to write a Point as a single atomic value (ie, reinterpret a Point as a double or int64 and use an atomic set).

is it atomic for writing a struct to same global memory location in CUDA?

1 Answers1