atomics

Ongoing Optimization: Sequential Consistency with CppMem

With atomic data types you can tailor your program to your needs and therefore optimize it. But now we are in the domain of the multithreading experts.

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CppMem - An Overview

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.

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Relaxed Semantic

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.

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Acquire-Release Fences

Acquire and release fences guarantees similar synchronisation and ordering constraints as atomics with acquire-release semantic. Similar, because the differences are in the details.

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Fences are Memory Barriers

The key idea of a std::atomic_thread_fence is, to establish synchronisation and ordering constraints between threads without an atomic operation.

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Acquire-Release Semantic - The typical Misunderstanding

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.

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memory_order_consume

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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Acquire-Release Semantic

With the acquire-release semantic the memory model gets very thrilling. Because now, we have not to reason about the synchronisation of threads, now we have to reason about the synchronisation of the same atomic in different threads.

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Sequential Consistency applied

I have introduced In the post Sequential Consistency the default memory model. This model, in which all operations in all threads takes place in a global time clock, has a big advantage but also a big disadvantage.

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