What does atomic mean in programming? - Stack Overflow "An operation acting on shared memory is atomic if it completes in a single step relative to other threads When an atomic store is performed on a shared memory, no other thread can observe the modification half-complete When an atomic load is performed on a shared variable, it reads the entire value as it appeared at a single moment in time "
What are atomic operations for newbies? - Stack Overflow Here, each upsert is atomic: the first one left count at 2, the second one left it at 3 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
atomic operations and atomic transactions - Stack Overflow Atomic Operations on the other hand are usually associated with low-level programming with regards to multi-processing or multi-threading applications and are similar to Critical Sections For example, if two threads both access and modify the same variable, each thread goes through the following steps:
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
java - Practical uses for AtomicInteger - Stack Overflow For instance getAndIncrement() is an atomic equivalent to i++ which is not atomic because it is actually a short cut for three operations: retrieval, addition and assignation compareAndSet is very useful to implements semaphores, locks, latches, etc Using the AtomicInteger is faster and more readable than performing the same using
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
thread safety - Atomic operations in ARM - Stack Overflow Generally I would suggest that one confine use of them to small methods like "atomic increment" and such, which could easily be rewritten if needed to use other approaches (e g on the Cortex-M0, they'd be implemented by temporarily disabling interrupts) –
Which is more efficient, basic mutex lock or atomic integer? Atomic operations leverage processor support (compare and swap instructions) and don't use locks at all, whereas locks are more OS-dependent and perform differently on, for example, Win and Linux Locks actually suspend thread execution, freeing up cpu resources for other tasks, but incurring in obvious context-switching overhead when stopping
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