lock

C++ Core Guidelines: Sharing Data between Threads

If you want to have fun with threads, you should share mutable data between them. In order to get no data race and, therefore, undefined behaviour, you have to think about the synchronisation of your threads.

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Tags: lock, mutex
Views: 69865

C++ Core Guidelines: Rules for Concurrency and Parallelism

C++11 is the first C++ standard that deals with concurrency. The basic building block for concurrency is a thread; therefore, most of the rules are explicitly about threads. This changed dramatically with C++17.

 

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Views: 73568

Single Threaded: Summation of a Vector

What is the fastest way to add the elements of a std::vector?. A question which I will pursue in the next posts. I use the single-threaded addition as the reference number. In further posts, I discuss atomics, locks, and thread-local data.

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Tags: atomics, lock
Views: 19883

Thread-Safe Initialization of a Singleton

There are a lot of issues with the singleton pattern. I'm totally aware of that. But the singleton pattern is an ideal use case for a variable, which has only to be initialized in a thread-safe way. From that point on you can use it without synchronization. So in this post, I discuss different ways to initialize a singleton in a multithreading environment. You get the performance numbers and can reason about your uses cases for the thread-safe initialization of a variable.

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Views: 257828

Ongoing Optimization: Locks and Volatile with CppMem

The easiest way to solve the undefined behaviour in the post Ongoing Optimization: Unsynchronized access is, to use a lock.

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Views: 10175

Reader-Writer Locks

With C++14 came reader-writer locks. The idea is straightforward and promising. Arbitrary reading threads can access the critical region at the same time, but only one thread is allowed to write.

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Tags: lock
Views: 55990

Prefer Locks to Mutexes

If the previous post showed something, it's, that you should use mutexes with great care. That's why you should wrap them in a lock.

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Tags: lock, mutex
Views: 115167

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