Most straightforward answer initial: There is no difference between your second two illustrations. By default, property accessors are atomic.
– tc. Commented Dec one, 2010 at eighteen:twenty @fyolnish I am undecided what _val/val are, but no, not likely. The getter for an atomic duplicate/keep property wants in order that it doesn't return an item whose refcount becomes zero thanks the setter remaining named in Yet another thread, which basically usually means it ought to go through the ivar, retain it when making sure which the setter has not overwritten-and-unveiled it, after which you can autorelease it to balance the keep.
He utilised "easy", "atomic" and "nondecomposable" as casual expository notions. He understood that a relation has rows of which Each individual column has an connected identify and worth; characteristics are by definition "single-valued"; the value is of any sort.
As you may have possibly guessed, reference count exercise/cycling is an important contributor with atomics and beneath ARC. You'd also see greater discrepancies in contested situations.
Andrew GrantAndrew Grant 58.8k2222 gold badges131131 silver badges144144 bronze badges 1 5 That comment does not make a great deal of feeling. Is it possible to explain? For those who look at examples around the Apple web site then the atomic search term synchronizes on the thing even though updating its Homes.
Because the Second World War, each theoretical and experimental fields have Sophisticated in a immediate speed. This can be attributed to progress in computing technology, that has permitted greater and even more advanced models of atomic composition and affiliated collision processes.
benefit is always returned within the getter or set because of the setter, no matter setter exercise on any other thread.
atomic Issues within the administration of know-how, whether it is aero-space or atomics, can frequently be right traced to faults in or defective equipment of presidency. From the Hansard archive
Such as, if another person is booking a flight, you want to both equally get payment AND reserve the seat OR do neither. If either a person ended up allowed to triumph without the other also succeeding, the databases could be inconsistent.
Physicists distinguish in between atomic physics—which promotions Together with the atom like a system consisting of a nucleus and electrons—and nuclear physics, which studies nuclear reactions and Exclusive Qualities of atomic nuclei.
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These sorts of denormalizations are very common, mainly because it is kind of hard to attract the line and what's atomic and what's not. Dependant upon the application, a multi-section column could really well be the most beneficial Remedy occasionally. It truly is less structured, but less difficult.