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.

Read more
Views: 74818

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.

Read more
Views: 22477

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.

Read more
Views: 21495

100 Posts Anniversary - Quo vadis Modernes C++?

As you may know, I translate in this blog the posts from my German blog into English. My German blog has the 100 posts anniversary. So I started a poll for the next new main topic.

Read more
Views: 13149

Transitivity of the Acquire-Release Semantic

A release operation synchronises with an acquire operation on the same atomic variable and establishes, in addition, 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
Views: 13308

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
Views: 67967

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
Views: 18469

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
Views: 29556

Atomics

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

Read more
Views: 58186

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
Views: 156204

My Newest E-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

Subscribe to the newsletter (+ pdf bundle)

Blog archive

Source Code

Visitors

Today 1719

Yesterday 6633

Week 22521

Month 127260

All 8426476

Currently are 206 guests and no members online

Kubik-Rubik Joomla! Extensions

Latest comments