|Message: Re: How to split file reading between cores||Not Logged In (login)|
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Yes you are not using the atomic properly, the value returned from file_pos++ is guaranteed to be unique but the value from file_pos.load() is not. Plus it needs to be static so that all the threads can see it.
This will work:
static std::atomic<G4int> file_pos; auto my_pos = file_pos++;
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