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- What are atomic operations for newbies? - Stack Overflow
Everything works Note that "atomic" is contextual: in this case, the upsert operation only needs to be atomic with respect to operations on the answers table in the database; the computer can be free to do other things as long as they don't affect (or are affected by) the result of what upsert is trying to do
- What does atomic mean in programming? - Stack Overflow
In the Effective Java book, it states: The language specification guarantees that reading or writing a variable is atomic unless the variable is of type long or double [JLS, 17 4 7] What do
- What is the difference between std::shared_ptr and std::atomic lt;std . . .
The atomic "thing" in shared_ptr is not the shared pointer itself, but the control block it points to meaning that as long as you don't mutate the shared_ptr across multiple threads, you are ok do note that copying a shared_ptr only mutates the control block, and not the shared_ptr itself
- c++ - What exactly is std::atomic? - Stack Overflow
Objects of atomic types are the only C++ objects that are free from data races; that is, if one thread writes to an atomic object while another thread reads from it, the behavior is well-defined In addition, accesses to atomic objects may establish inter-thread synchronization and order non-atomic memory accesses as specified by std::memory_order
- Is there a difference between the _Atomic type qualifier and type . . .
Why the standard make that difference? It seems as both designate, in the same way, an atomic type
- c++ - How to use std::atomic efficiently - Stack Overflow
std::atomic is new feature introduced by c++11 but I can't find much tutorial on how to use it correctly So are the following practice common and efficient? One practice I used is we have a buff
- 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
- What is the difference between atomic_int and int？
In addition to atomicity, atomic types also allow you to control the ordering of memory operations, which may be of vital importance For instance, even though writing to aligned int with mov instruction is atomic on x64, with atomic_int, compilers typically generate xchg thanks to the default sequential consistency ordering requirements
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