How do I iterate safely under modification with std::set in multithreaded code?

Iterating safely over a std::set in multithreaded C++ code requires careful management of locks to prevent data races and undefined behavior. Since std::set is not thread-safe by default, you need to ensure that no other thread modifies the set while you are iterating over it. This can be achieved using locks, such as std::mutex, to synchronize access.

Here’s how you can safely iterate over a std::set while allowing other threads to modify it:


        #include <iostream>
        #include <set>
        #include <thread>
        #include <mutex>

        std::set<int> mySet;
        std::mutex myMutex;

        void addElement(int value) {
            std::lock_guard<std::mutex> lock(myMutex);
            mySet.insert(value);
        }

        void iterateSet() {
            std::lock_guard<std::mutex> lock(myMutex);
            for (const auto &element : mySet) {
                std::cout << element << std::endl;
            }
        }

        int main() {
            std::thread t1(addElement, 1);
            std::thread t2(addElement, 2);
            std::thread t3(iterateSet);

            t1.join();
            t2.join();
            t3.join();

            return 0;
        }

C++ std::set multithreaded iteration locks std::mutex

How do I iterate safely under modification with std::set in multithreaded code?

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How do I iterate safely under modification with std::set in multithreaded code?

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