Originally posted by CL Gilbert:
longs and doubles no, everything else I believe the answer is yes.
What I know for certain is that longs and doubles are not guaranteed to have write-atomicity: you may read half of the new value and half of the old value. The others do have write-atomicity.
Since increment and decrement are a read-and-write operation, I can't say for certain whether they are threadsafe. What you are guaranteed of is that you'll either get the whole old or new value. Of course, if two increment operations get split, you'd end up with only a single increment.