atomics

memory_order_consume

std::memory_order_consume is the most legendary of the six memory models. That's for two reasons. On one hand, std::memory_order_consume is extremely hard to get. On 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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Synchronization and Ordering Constraints

In this post, our tour through the c++ memory model goes one step deeper. Until now, the posts were only about the atomicity of the atomic data types but now we deal with the synchronisation and ordering constraints of the operations.

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Atomics

In addition to booleans, there is atomics for pointers, integrals and user-defined types. The rules for user-defined types are special.

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The Atomic Boolean

The remaining atomics - in contrast to std::atomic_flag - are partial or full specialisations of the class template std::atomic. Let's start with std::atomic<bool>.

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The Atomic Flag

Atomics guarantee two characteristics. On one hand, they are atomic, on the other hand, they provide synchronization and order constraints on the program execution.

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Sequential Consistency

The atomics are the base of the C++ memory model. Per default, sequential consistency is applied.

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Views: 43829

Mentoring

English Books

Course: Modern C++ Concurrency in Practice

Course: C++ Standard Library including C++14 & C++17

Course: Embedded Programming with Modern C++

Course: Generic Programming (Templates)

Course: C++ Fundamentals for Professionals

Interactive Course: The All-in-One Guide to C++20

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