Question

I have multiple threads reading same int variable.
and one thread is writing the value.

I don’t care about the race condition.

only my concern is writing and reading int value at same time is memory safe ?

and it will not result in any application crash .

Answer 1

Yes, that should be all right. The only way I can envision that crashing is if one of the threads deallocates the memory backing that integer. For best results I would also make sure the integers are aligned at sizeof(int) boundaries. (Some CPUs cannot access integers at all without this alignment. Others provide weaker guarantees of atomicity for unaligned access.)