Archive for category: Multithreading

The Time Library

March 22, 2023

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A blog dealing with multithreading in modern C++ but not writing about the new time library is incomplete.…

Multithreading with C++17 and C++20

March 22, 2023

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Forecasts about the future are difficult. In particular, when they are about C++20. Nevertheless, I…

Multithreading in Modern C++

March 22, 2023

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With the new C++11 Standard, C++ faces the first time challenges of multicore architectures. The…

An illustration of the dining philosophers problem

Dining Philosophers Problem III

January 8, 2022

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This post ends the mini-series about the dining philosophers problem by Andre Adrian. Today, he applies…

An illustration of the dining philosophers problem

Dining Philosophers Problem II

January 8, 2022

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In the last post "Dining Philosophers Problem I", Andre Adrian started his analysis of the classical…

An illustration of the dining philosophers problem

Dining Philosophers Problem I

January 7, 2022

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At Christmas time, I had a few nice discussions with Andre Adrian. He solved the classical dining philosopher's…

timeline

A new Thread with C++20: std::jthread

October 19, 2018

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One of the participants in my CppCon 2018 workshop asked me: "Can a std::thread be interrupted?". No,…

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The End of my Detour: Unified Futures

June 15, 2018

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After the last post to executors, I can finally write about the unified futures. I write in the post…

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A Short Detour: Executors

June 8, 2018

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A few weeks ago, one of the authors of the proposal to the futures in C++ Felix Petriconi wrote me an…

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ABA – A is not the same as A

June 9, 2017

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A common problem in concurrency is the so-called ABA problem. That means you read a value twice and each…

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A Lock-Free Stack: Atomic Smart PointerFebruary 17, 2025 - 11:47 am
The easiest way to solve this memory leak issue from the last post is to use a std::shared_ptr. Atomic Smart Pointer There are two ways to apply atomic operations on a std::shared_ptr: In C++11, you can use the free atomic functions on std::shared_ptr. With C++20, you can use atomic smart pointers. C++11 Using atomic operations […]
A Lock-Free Stack: A Complete ImplementationFebruary 10, 2025 - 3:01 pm
My last lock-free stack implementation was incomplete. It only supported push operations. Let’s change this. The following paragraph about sequential consistency is optional. You can easily ignore it. Sequential Consistency In my examples, I use the default memory ordering: sequential consistency. The reason is simple. Sequential consistency provides the strongest guarantees of all memory ordering […]
My Next Mentoring Program: “Generic Programming (Templates) with C++” startsFebruary 4, 2025 - 4:51 pm
My next mentoring program, “Embedded Programming with Modern C++,” starts on January 31st. Registration is open. Here are more details. Embedded Programming with Modern C++ The mentoring program consists of 16 stations. You have to invest at least 3 hours per week for each one. This means the program takes four months, and you can […]
A Lock-Free Stack: A Simplified ImplementationFebruary 3, 2025 - 10:37 am
Today, I continue my mini story about lock-free data structures. General Considerations From the outside, the caller’s responsibility (application) is to protect the data. From inside, the data structure is responsible for protecting itself. A data structure that protects itself so a data race cannot appear is called thread-safe. First, what general considerations must you […]
Deferred Reclamation in C++26: Read-Copy Update and Hazard PointersJanuary 27, 2025 - 12:23 pm
Before I dive into lock-free programming, there’s a little bit of theory necessary. A common problem in concurrency is the so-called ABA problem. That means you read a variable twice, which returns the same value each time, A. Therefore, you conclude that nothing changed in between. But you forgot the B. Let me first use […]
std::format ExtensionJanuary 20, 2025 - 11:55 am
Displaying the address of an arbitrary pointer in C++ 20 fails but succeeds with C++26. C++20 Only void, const void, and std::nullptr_t pointer types are valid. If you want to display the address of an arbitrary pointer, you must cast it to (const) void*. // formatPointer20.cpp #include <format> #include <iostream> #include <string> int main() { […]