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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
Which types on a 64-bit computer are naturally atomic in gnu C and gnu . . . 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
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
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
Is an atomic file rename (with overwrite) possible on Windows? On POSIX systems rename(2) provides for an atomic rename operation, including overwriting of the destination file if it exists and if permissions allow Is there any way to get the same semantics on
Understanding std::atomic::compare_exchange_weak() in C++11 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
How to guarantee 64-bit writes are atomic? - Stack Overflow 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
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
What does std::atomic::is_always_lock_free = true really mean? If for some type T the library has been able to specialize std::atomic<T> with such an implementation, then that is what we mean by saying it is lock free (It is just confusing on x86 because the atomic instructions used for such implementations are named lock
Using std::condition_variable with atomic lt;bool gt; 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