The easiest way to solve the undefined behaviour in the post Ongoing Optimization: Unsynchronized access is, to use a lock.
I've described my challenge in the last post. Let' start with our process of ongoing optimization. To be sure, I verify my reasoning with CppMem. I once made a big mistake in my presentation at Meeting C++ 2014.
Something completely different. I'm looking for English proofreaders for my new book.
Now it's time to put the theory into practice. The job is quite easy. A small program should undergo an ongoing optimization.
CppMem is an interactive tool for exploring the behaviour of small code snippets of the C++ memory model. It should, no it has to be in the tool box of each programmer, who deals seriously with the memory model.
The relaxed semantic is the end of the Scala. The relaxed semantic is the weakest of all memory models and guarantees only, that the operations on atomic variables are atomic.
Acquire and release fences guarantees similar synchronisation and ordering constraints as atomics with acquire-release semantic. Similar, because the differences are in the details.
The key idea of a std::atomic_thread_fence is, to establish synchronisation and ordering constraints between threads without an atomic operation.
A release operation synchronizes-with an acquire operation on the same atomic variable. So we can easily synchronise threads, if ... . Today's post is about the if.
std::memory_order_consume is the most legendary of the six memory models. That's for two reasons. At one hand, std::memory_order_consume is extremely hard to get. At the other hand - that may change in the future - no compiler supports it.
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