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.

Read more
Add CommentViews: 4448

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.

Read more
Comments 3Views: 10076

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.

Read more
Comments 2Views: 7530

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.

Read more
Comments 5Views: 13241

Atomics

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

Read more
Comments 5Views: 17966

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>.

Read more
Comments 15Views: 43274

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.

Read more
Comments 1Views: 18184

Sequential Consistency

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

Read more
Comments 80Views: 16866

The Facebook Group Modernes C++

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

Read more
Comments 4Views: 5927

Subscribe to the newsletter (+ pdf bundle)

Blog archive

Source Code

Visitors

Today 1281

All 1697669

Currently are 163 guests and no members online

Kubik-Rubik Joomla! Extensions

Latest comments