Within one thread, steady_clock::now() is guaranteed to return monotonically increasing values. How does this interact with memory ordering and reads observed by multiple threads? atomic<int>...

On Visual C++ 2013, when I compile the following code #include <atomic> int main() { std::atomic<int> v(2); return v.fetch_add(1, std::memory_order_relaxed); } I get back the foll...

A full/general memory barrier is one where all the LOAD and STORE operations specified before the barrier will appear to happen before all the LOAD and STORE operations specified after the barrier ...

Is there any wording in the standard that guarantees that relaxed stores to atomics won't be lifted above the locking of a mutex? If not, is there any wording that explicitly says that it's kosher ...

Suppose I have a thread A that writes to an atomic_int x = 0;, using x.store(1, std::memory_order_relaxed);. Without any other synchronization methods, how long would it take before other threads c...

After seeing Herb Sutters excellent talk about "atomic weapons" I got a bit confused about the Relaxed Atomics examples. I took with me that an atomic in the C++ Memory Model (SC-DRF = Sequentiall...

Consider the following code: struct payload { std::atomic< int > value; }; std::atomic< payload* > pointer( nullptr ); void thread_a() { payload* p = new payload(); p->value.st...

Imagine N threads running following simple code: int res = num.fetch_add(1, std::memory_order_relaxed); where num is: std::atomic<int> num = 0; Is it completelly safe to assume, that re...

I have a thread that reads from a socket and generates data. After every operation, the thread checks a std::atomic_bool flag to see if it must exit early. In order to cancel the operation, I set...

Consider the following code snippet taken from Herb Sutter's talk on atomics: The smart_ptr class contains a pimpl object called control_block_ptr containing the reference count refs. // Thread A...

I am trying to understand the specifics of memory_order_relaxed. I am referring to this link : CPP Reference. #include <future> #include <atomic> std::atomic<int*> ptr {nullptr...

I've written a container for a very simple piece of data that needs to be synchronized across threads. I want the top performance. I don't want to use locks. I want to use "relaxed" atomics. Partl...