thread_local

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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Multithreaded: Summation with Minimal Synchronization

Until now, I've used two strategies for the summation of a std::vector. First, I did the whole math in one thread (Single Threaded: Summation of a vector); second multiple threads shared the same variable for the result (Multithreaded: Summation of a vector). In particular, the second strategy was extremely naive. In this post, I will apply my knowledge of both posts. My goal is that the thread will perform their summation as independently from each other as possible and therefore reduce the synchronization overhead. 

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Thread-Local Data

By using the keyword thread_local, you define the thread local data. Thread-local can easily be explained in a few words.

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