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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
- 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
- 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
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 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
- 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
- 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
- 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
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