EDIT: As identified the right way by Bo Persson, the copy Procedure performed via the wrapper is just not atomic. It lets you copy atomic objects, though the copy by itself is just not atomic.
Here's an illustration: Suppose foo can be a variable of style very long, then the next Procedure just isn't an atomic operation (
Considering the fact that one only requirements just one bit to point which the lock is taken, we use the remainder of the lock phrase to hold a version quantity.
– jogojapan Commented Nov two, 2012 at twelve:08 five @BoPersson Ah. That is ideal. For that OP: Without a doubt this implementation allows concurrent access to The weather on the vector, but not the vector alone. If, say, a single thread modifies the worth saved in one of several atomics even though One more thread adds new components to the vector, a vector reallocation might come about and the thing the very first thread modifies may very well be copied from one particular location in the vector to another.
As Other folks have adequately pointed out, the reason for the compiler's mistake is usually that std::atomic explicitly prohibits the duplicate constructor.
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I form of recognize that AtomicInteger and other Atomic variables make it possible for concurrent accesses. In what scenarios Is that this course usually made use of nevertheless?
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– H2ONaCl Commented Dec six, 2022 at one:37 yeah, that's truthful. I guess my level is that men and women may well examine "instantaneous" and by analogy with regular expectations of linear time, make the bounce to assuming linearizability - in which if one particular Procedure transpires just before A different, the thing is the results in that buy too. Which isn't a assure specific atomic functions offer when mixed.
atomic just signifies that intermediate states from the atomic operations cannot be observed. In observe, the two compilers and CPUs reorder Guidance to enhance effectiveness, this kind of that solitary-threaded code continue to behaves the identical, though the reordering is observable from other threads.
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