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Conclusion

Explore the implementation and performance of thread-safe singleton patterns in C++. Understand why the Meyers Singleton is considered the fastest and simplest approach, with near-single-thread speed and optimal concurrency across multiple threads. Learn how synchronization methods impact performance on Linux and Windows, helping you choose the best strategy for your concurrency needs.

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The numbers give a clear indication; the Meyers Singleton is the easiest to understand and the fastest one. It’s about two times faster than the atomic versions. As expected, the synchronization with the lock is the most heavyweight and, therefore, the slowest. In particular, std::call_once on Windows is a lot slower than on ...