Notice that "atomic" is contextual: In cases like this, the upsert operation only should be atomic with respect to functions on the responses table inside the databases; the pc may be totally free to do other items providing they don't impact (or are afflicted by) the result of what upsert is attempting to try and do.
– tc. Commented Dec one, 2010 at eighteen:twenty @fyolnish I am undecided what _val/val are, but no, probably not. The getter for an atomic duplicate/keep property requirements making sure that it doesn't return an item whose refcount results in being zero due the setter becoming referred to as in One more thread, which fundamentally usually means it really should read the ivar, keep it though making sure which the setter has not overwritten-and-introduced it, then autorelease it to harmony the retain.
He used "simple", "atomic" and "nondecomposable" as casual expository notions. He understood that a relation has rows of which Each individual column has an affiliated name and benefit; attributes are by definition "one-valued"; the value is of any kind.
Do not forget, this doesn't suggest that the assets as a whole is thread-Safe and sound. Only the method phone of the setter/getter is. But when you utilize a setter and after that a getter simultaneously with two various threads, it could be damaged too!
Andrew GrantAndrew Grant 58.8k2222 gold badges131131 silver badges144144 bronze badges 1 5 That comment does not make plenty of feeling. Is it possible to make clear? When you evaluate illustrations about the Apple site then the atomic search phrase synchronizes on the article though updating its Attributes.
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That fundamentally implies both the getter and setter should use a lock (In the event the memory structure was set it ought to be doable with CAS2 instructions; alas -retain is a technique contact).
atomic clock), along with the definition with the metre to be a device of size is currently relevant to frequency measurements in the velocity of sunshine. Also, lasers have built probable solely new systems for isolating particular person atoms in electromagnetic traps and cooling them to in the vicinity of complete zero. If the atoms are brought basically to rest during the entice, they will bear a quantum mechanical stage transition to variety a superfluid often called a Bose-Einstein condensation, when remaining in the form of the dilute fuel. In this particular new state of matter, many of the atoms are in a similar coherent quantum condition.
Let's think about the following multi-threaded plan which increments a global variable throughout various threads, with distinctive synchronization mechanisms based upon which preprocessor determine is applied.
atomic just implies that intermediate states of the atomic functions can't be found. In follow, each compilers and CPUs reorder instructions to boost efficiency, such that solitary-threaded code nonetheless behaves the same, even so the reordering is observable from other threads.
– tc. Commented Dec 10, 2013 at eleven:09 @tc It has been very a while but what I meant to jot down was likely this: gist.github.com/fjolnir/5d96b3272c6255f6baae But Of course it is achievable to the old benefit being read through by a reader ahead of setFoo: returns, and launched before the reader returns it. But it's possible If your setter employed -autorelease rather than -launch, that might repair that.
It is really something which "seems to the rest of the process to take place instantaneously", and falls less than categorisation of Linearizability in computing processes. To quotation that linked report additional:
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The only real structural home that matters relationally is remaining a relation. It's also just Atomic Wallet a price, however , you can query it relationally