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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Views: 15809

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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Views: 23901

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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Views: 50398

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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Views: 15932

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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Views: 14825

Transitivity of the Acquire-Release Semantic

A release operation synchronises with an acquire operation on the same atomic variable and establishes, in addition, an ordering constraints. These are the components to synchronise threads in a performant way, in case they act on the same atomic. But how can that work, if two threads share no atomic variable? We want no sequential consistency because that is too heavy. We want the light acquire-release semantic.

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Views: 8019

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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Views: 19946

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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Views: 12663

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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Views: 20629

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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Views: 37875

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