Atomics

Fences are Memory Barriers

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

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Acquire-Release Semantics - 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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Views: 27960

memory_order_consume

std::memory_order_consume is the most legendary of the six memory models. That's for two reasons. On the 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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Views: 27225

Acquire-Release Semantic

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

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Views: 78319

Sequential Consistency applied

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

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Views: 23362

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 synchronization and ordering constraints of the operations.

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Views: 36443

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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Views: 69982

The Atomic Boolean

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

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Views: 193663

The Atomic Flag

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

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Views: 64538

Sequential Consistency

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

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Views: 49375

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