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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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The Update of my Book “Concurreny with Modern C++”

June 12, 2018

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The update of my book "Concurrency with Modern C++" is available. This version is a total rework of the…

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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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C++ Core Guidelines: Be Aware of the Traps of Condition Variables

June 1, 2018

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Today, I am writing a scary post about condition variables. You should be aware of these issues of condition…

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C++ Core Guidelines: More Traps in the Concurrency

May 24, 2018

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Concurrency provides many ways to shoot yourself in the foot. The rules for today help you to know these…

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C++ Core Guidelines: Taking Care of your Child Thread

May 18, 2018

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When you create a new child thread, you must answer an important question: should you wait for the child…

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C++ Core Guidelines: Sharing Data between Threads

May 11, 2018

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If you want to have fun with threads, you should share mutable data between them. To get no data race…

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C++ Core Guidelines: Use Tools to Validate your Concurrent Code

May 4, 2018

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Today, I'm happy to write about the probably most important C++ Core Guidelines for concurrency rule:…

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C++ Core Guidelines: More Rules about Concurrency and Parallelism

April 27, 2018

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Writing multithreading programs is hard, even harder if the program should be correct. The rules of the…

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C++ Core Guidelines: Rules for Concurrency and Parallelism

April 21, 2018

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C++11 is the first C++ standard that deals with concurrency. The basic building block for concurrency…

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The new pdf bundle is ready: Functional Features in C++

April 15, 2018

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I have prepared the pdf bundle. To get it is quite simple. If you subscribe to the newsletter, you…

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C++ Core Guidelines: The Remaining Rules about Performance

April 13, 2018

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Today, I will write about the remaining ten rules of performance. Ten rules seem to be a lot, but only…

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Hazard Pointers in C++26May 5, 2025 - 11:12 am
Hazard pointers provide garbage collection in C++ and solve the ABA problem. First of all. What is a hazard pointer? Proposal P2530R3 gives a nice explanation: A hazard pointer is a single-writer multi-reader pointer that can be owned by at most one thread at any time. Only the owner of the hazard pointer can set […]
A Lock-Free Stack: A Hazard Pointer Implementation Explained IIApril 7, 2025 - 11:11 am
In my last post, I started to explain a hazard pointer implementation: A Lock-Free Stack: A Hazard Pointer Implementation Explained I. Today, I will continue to explain the implementation. The Retire List The retire list has the public member functions isInUse, addNode, and deleteUnusedNodes. Additionally, it has the inner class RetireNode, an atomic member of […]
A Lock-Free Stack: A Hazard Pointer Implementation Explained IMarch 24, 2025 - 11:37 am
In my last post, I presented a hazard pointer implementation: A Lock-Free Stack: A Hazard Pointer Implementation. Today, I will explain the implementation. MyNode is a class template, parametrized by the type it holds: data. MyNode models the concept Node. template <typename T> concept Node = requires(T a) { {T::data}; { *a.next } -> std::same_as<T&>; […]
A Lock-Free Stack: A Hazard Pointer ImplementationMarch 10, 2025 - 11:42 am
Hazard Pointers solve all issues of the previous implementation: A Lock-Free Stack: A Simple Garbage Collector. From one Week to two Weeks You may have already noticed. I will change my blog publishing frequency from one to two weeks in the future. Writing a post using your voice is exceptionally exhausting and time-consuming. Hazard Pointers […]
A Lock-Free Stack: A Simple Garbage CollectorFebruary 24, 2025 - 11:58 am
My next lock-free stack includes a simple garbage collector. I discussed the concurrent execution of more than one topAndPush call is a Race Condition. I can safely delete a node if not more than one topAndPush call is executing concurrently. This observation is crucial for solving this memory leak issue: I store removed nodes on […]
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 […]