[MaxGanzII]

> So yes, that "++*barrier" operation is read-modify-write atomically AND with memory-barriers in sequential-consistency style

The quoted material does not describe this assertion.

[dragontamer]

> Built-in increment and decrement operators and compound assignment are read-modify-write atomic operations with total sequentially consistent ordering (as if using memory_order_seq_cst). If less strict synchronization semantics are desired, the standard library functions may be used instead.