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What does "atomic" mean in programming? - Stack Overflow
0. According to Oracle, In programming, an atomic action is one that effectively happens all at once. An atomic action cannot stop in the middle: it either happens completely, or it doesn't happen at all. No side effects of an atomic action are visible until the action is complete.
c++ - Are +=, |=, &= etc atomic? - Stack Overflow
Even if the compiler can generate an atomic increment, whether x++ can be atomic may depend on the data type of x. For example on SF's target an increment of x if x is 'long long', will not be atomic, and if it were another integral type, it may conceivably depend on the specific ARM architecture and the data alignment. –
What are atomic operations for newbies? - Stack Overflow
Atomic operation refers to a sequence of instructions that are executed as a single, indivisible unit of work. This means that during its execution, the operation is either completely performed or not performed at all, with no intermediate states visible to other threads or processes. answered Aug 30 at 23:15.
sql - What is atomicity in dbms - Stack Overflow
The definition of atomic is hazy; a value that is atomic in one application could be non-atomic in another. For a general guideline, a value is non-atomic if the application deals with only a part of the value. Eg: The current Wikipedia article on First NF (Normal Form) section Atomicity actually quotes from the introductory parts above.
c++ - How to implement an atomic counter - Stack Overflow
If you really mean to use a global variable for the atomic, the correct (and fastest) code that does what your first code block attempts is: static std::atomic id{0}; return id.fetch_add(1, std::memory_order_relaxed) + 1; Notes: You can leave away the + 1 if you want post-increment.
What's the difference between the atomic and nonatomic attributes?
Atomicity property attributes (atomic and nonatomic) are not reflected in the corresponding Swift property declaration, but the atomicity guarantees of the Objective-C implementation still hold when the imported property is accessed from Swift. So — if you define an atomic property in Objective-C it will remain atomic when used by Swift.
c++ - What exactly is std::atomic? - Stack Overflow
3. @AaryamanSagar: std::atomic is a type that allows for atomic operations. It doesn't magically make your life better, you still have to know what you want to do with it. It's for a very specific use case, and uses of atomic operations (on the object) are generally very subtle and need to be thought of from a non-local perspective.
How to guarantee 64-bit writes are atomic? - Stack Overflow
6. On X86, the fastest way to atomically write an aligned 64-bit value is to use FISTP. For unaligned values, you need to use a CAS2 (_InterlockedExchange64). The CAS2 operation is quite slow due to BUSLOCK though so it can often be faster to check alignment and do the FISTP version for aligned addresses.
C++20 std::atomic- std::atomic.specializations
Yes, this is the only purpose of an atomic regardless of the actual type. may it be an atomic bool, char, int, long or whatever. Whatever usage you have for type, std::atomic is a thread-safe version of it. Whatever usage you have for a float or a double, std::atomic can be written, read or compared with a thread-safe manner ...
What are atomic types in the C language? - Stack Overflow
The type sig_atomic_t is always an integer data type, but which one it is, and how many bits it contains, may vary from machine to machine. Data Type: sig_atomic_t. This is an integer data type. Objects of this type are always accessed atomically. In practice, you can assume that int is atomic. You can also assume that pointer types are atomic ...
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