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 are 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. At one hand, they are atomic, at the other hand, they provide synchronisation 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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The Facebook Group Modernes C++

I created the facebook group Modernes C++. I see one big advantage in this group.

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C++ Memory Model

Since C++11, C++ has a memory model. It is the foundation for multithreading. Without it, multithreading is not well defined. 

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