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atomic    音标拼音: [ət'ɑmɪk]
a. 原子的,原子武器的;核的,核能的

原子的,原子武器的;核的,核能的

atomic
原子 基元

atomic
adj 1: of or relating to or comprising atoms; "atomic
structure"; "atomic hydrogen"
2: (weapons) deriving destructive energy from the release of
atomic energy; "nuclear war"; "nuclear weapons"; "atomic
bombs" [synonym: {nuclear}, {atomic}] [ant: {conventional}]
3: immeasurably small

Atomic \A*tom"ic\, Atomical \A*tom"ic*al\, a. [Cf. F. atomique.]
1. Of or pertaining to atoms.
[1913 Webster]

2. Extremely minute; tiny.
[1913 Webster]

{Atomic bomb}, see {atom bomb} in the vocabulary.

{Atomic philosophy}, or {Doctrine of atoms}, a system which,
assuming that atoms are endued with gravity and motion,
accounted thus for the origin and formation of all things.
This philosophy was first broached by Leucippus, was
developed by Democritus, and afterward improved by
Epicurus, and hence is sometimes denominated the Epicurean
philosophy.

{Atomic theory}, or the {Doctrine of definite proportions}
(Chem.), teaches that chemical combinations take place
between the supposed ultimate particles or atoms of
bodies, in some simple ratio, as of one to one, two to
three, or some other, always expressible in whole numbers.


{Atomic weight} (Chem.), the weight of the atom of an element
as compared with the weight of the atom of hydrogen, taken
as a standard.
[1913 Webster]

66 Moby Thesaurus words for "atomic":
a certain, an, any, any one, atomatic, atomiferous, atomistic,
corpuscular, cyclic, diatomic, dibasic, either, embryonic,
evanescent, exclusive, germinal, granular, heteroatomic,
heterocyclic, hexatomic, homocyclic, impalpable, imperceptible,
imponderable, inappreciable, indiscernible, individual,
indivisible, infinitesimal, intangible, integral, invisible,
irreducible, isobaric, isocyclic, isoteric, isotopic, lone,
microcosmic, microscopic, molecular, monadic, monatomic, monistic,
one, pentatomic, simple, single, singular, sole, solid, solitary,
subatomic, tenuous, tetratomic, thin, triatomic, tribasic,
ultramicroscopic, unanalyzable, undivided, uniform, unique,
unitary, unseeable, whole

(From Greek "atomos", indivisible) Indivisible;
cannot be split up.

For example, an instruction may be said to do several things
"atomically", i.e. all the things are done immediately, and
there is no chance of the instruction being half-completed or
of another being interspersed. Used especially to convey that
an operation cannot be interrupted.

An atomic {data type} has no internal structure visible to the
program. It can be represented by a flat {domain} (all
elements are equally defined). Machine {integers} and
{Booleans} are two examples.

An atomic {database transaction} is one which is guaranteed to
complete successfully or not at all. If an error prevents a
partially-performed transaction from proceeding to completion,
it must be "backed out" to prevent the database being left in
an inconsistent state.

[{Jargon File}]

(2000-04-03)


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  • What does atomic mean in programming? - Stack Overflow
    22 Atomic vs Non-Atomic Operations "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
  • 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
  • c++ - the gist behind atomic shared pointer - Stack Overflow
    At least atomic<shared_ptr<T>> gives you per-object locking, instead of a single lock for the whole stack So multiple threads can be waiting for different locks if multiple pops start in parallel
  • 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
  • What are atomic types in the C language? - Stack Overflow
    I remember I came across certain types in the C language called atomic types, but we have never studied them So, how do they differ from regular types like int,float,double,long etc , and what are
  • 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
  • When do I really need to use atomic lt;bool gt; instead of bool?
    You need atomic<bool> to avoid race-conditions A race-condition occurs if two threads access the same memory location, and at least one of them is a write operation If your program contains race-conditions, the behavior is undefined
  • c++ - What is the difference between load store relaxed atomic and . . .
    11 The difference is that a normal load store is not guaranteed to be tear-free, whereas a relaxed atomic read write is Also, the atomic guarantees that the compiler doesn't rearrange or optimise-out memory accesses in a similar fashion to what volatile guarantees (Pre-C++11, volatile was an essential part of rolling your own atomics
  • c++ - Cross-platform Support for 128-bit Atomic Operations in Clang . . .
    We are currently evaluating 128-bit atomic operation support across platforms and compilers, and I wanted to confirm the level of support available in Clang specifically Our reference point is the
  • Is incrementing an int effectively atomic in specific cases?
    The reason num++ appears to be atomic is because on x86 machines, incrementing a 32-bit integer is, in fact, atomic (assuming no memory retrieval takes place) But this is neither guaranteed by the c++ standard, nor is it likely to be the case on a machine that doesn't use the x86 instruction set





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