Thread Synchronization in Concurrent Systems: A Study of Dekker’s Algorithm, Peterson’s Algorithm, and Semaphore-Based Solutions

The proliferation of multi-core processors has made concurrency a central paradigm in modern software development. While concurrent execution offers significant performance benefits, it introduces the critical challenge of synchronizing access to shared resources to prevent race conditions, data corruption, and inconsistent states. This paper traces the evolution of thread synchronization solutions, beginning with the pioneering software-only mutual exclusion algorithms of Dekker and Peterson. These algorithms provided the theoretical foundation for ensuring that only one thread can execute in a critical section at a time without relying on hardware-specific instructions. The paper then explores how Dijkstra's semaphore concept extended these ideas into a more practical and powerful tool by eliminating busy waiting and providing a structured mechanism for signaling and coordination. The primary objectives are to analyze the design, properties, and limitations of Dekker's and Peterson's algorithms, demonstrate the application of semaphores to classical synchronization problems; namely the Producer-Consumer, Bounded Buffer, and Readers-Writers problems and provide a comparative analysis of their advantages and relevance in the context of modern operating systems and programming languages. The analysis concludes that while the classical algorithms are primarily of historical and educational value today, the principles they established are directly embodied in the sophisticated synchronization primitives used in contemporary systems.