John Dalton developed the modern atomic theory that explained matter as being made of tiny atoms. Dalton's Atomic Theory includes ideas like atoms are small and indestructible and obey specific laws. Before Dalton, people like Democritus and Aristotle had different beliefs about the nature of atoms.
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.
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.
The biggest question is whether an atomic can simply be allocated in shared memory (placement new) and work. Obviously this would only work if it is a true hardware atomic.
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++ - What is the difference between load/store relaxed atomic and ...
Each statement is atomic, but if you want the stored procedure to be atomic (or any sequence of statements in general), you need to explicitly surround the statements with
Yes and no. rename () is atomic assuming the OS does not crash. It cannot be split by any other filesystem op. If the system crashes you might see a ln () operation instead. (But see discussion on journalled filesystems in comments.) Also note, when operating on a network filesystem, you might get ENOENT when the operation succeeded successfully. Local filesystem can't do that to you.
I had a 25-hr debugging marathon in < 2 days and then wrote this answer here. See also the bottom of this question for more info. and documentation on 8-bit variables having naturally atomic writes and naturally atomic reads for AVR 8-bit microcontrollers when compiled with the gcc compiler which uses the AVR-libc library.
Which types on a 64-bit computer are naturally atomic in gnu C and gnu ...
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.
Atomic groups would be used in specific scenarios where greedy quantifiers are used, and further combinations are possible even though there is no alternation. Atomic and non-capturing groups are different. Non-capturing groups don't save the matches' value, while atomic groups disable backtracking if further combinations are needed.
So, this means that Richard Barry is saying that 4-byte reads and writes are atomic on these 32-bit microcontrollers. This means that he, at least, is 100% sure 4-byte reads and writes are atomic on STM32. He doesn't mention smaller-byte reads, but for 4-byte reads he is conclusively sure.
There are two atomic CAS operations in C++11: atomic_compare_exchange_weak and atomic_compare_exchange_strong. According to cppreference: The weak forms of the functions are allowed to fail spurio...
In addition (and more importantly), note that std::atomic must support all operations for all possible data types, so even if you declare a ten million byte struct, you can use compare_exchange on this.
When can 64-bit writes be guaranteed to be atomic, when programming in C on an Intel x86-based platform (in particular, an Intel-based Mac running MacOSX 10.4 using the Intel compiler)? For exampl...
There are several questions on SO dealing with atomic, and other that deal with std::condition_variable. But my question if my use below is correct? Three threads, one ctrl thread that does prepar...
Are C/C++ fundamental types, like int, double, etc., atomic, e.g. threadsafe? Are they free from data races; that is, if one thread writes to an object of such a type while another thread reads fr...
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EXPLAIN definition: to make plain or clear; render understandable or intelligible. See examples of explain used in a sentence.
To explain is to make plain, clear, or intelligible something that is not known or understood: to explain a theory or a problem. To elucidate is to throw light on what before was dark and obscure, usually by illustration and commentary and sometimes by elaborate explanation: They asked him to elucidate his statement.
EXPLAIN meaning: 1. to make something clear or easy to understand by describing or giving information about it: 2…. Learn more.
Explain, elucidate, expound, interpret imply making the meaning of something clear or understandable. To explain is to make plain, clear, or intelligible something that is not known or understood: to explain a theory or a problem.
Synonyms: explain, elucidate, explicate, interpret, construe These verbs mean to make the nature or meaning of something understandable. Explain is the most widely applicable: The professor used a diagram to explain the theory of continental drift. The manual explained how the new software worked.
Explain is the most general of these words, and means to make plain, clear, and intelligible. Expound is used of elaborate, formal, or methodical explanation: as, to expound a text, the law, the philosophy of Aristotle.