Race Condition When Using std::atomic and lambda in C++14 with Multiple Threads
I'm refactoring my project and I'm working with a race condition when using `std::atomic` variables inside a lambda function that's executed by multiple threads... I expected the atomic operations to ensure thread safety, but I'm observing inconsistent results. Here's a simplified version of what I have: ```cpp #include <iostream> #include <thread> #include <atomic> std::atomic<int> counter{0}; void incrementCounter() { for (int i = 0; i < 1000; ++i) { auto increment = [&]() { counter++; }; increment(); } } int main() { std::thread t1(incrementCounter); std::thread t2(incrementCounter); t1.join(); t2.join(); std::cout << "Final counter value: " << counter.load() << std::endl; return 0; } ``` I expected the final output to be `2000`, but sometimes I see it being less than that. I verified that the `counter` variable is indeed `std::atomic`, yet it seems like multiple threads are still writing to it simultaneously without proper synchronization. I've also tried replacing the lambda with a simple direct atomic increment: ```cpp counter.fetch_add(1); ``` But I'm still working with the same scenario. Is there something I'm missing in how I'm structuring my threads or using `std::atomic`? Any guidance on proper usage with lambda functions in a multi-threaded context in C++14 would be greatly appreciated. I'm coming from a different tech stack and learning C++. I'm developing on Linux with C++. Am I approaching this the right way?