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Explore Semaphore in Operating System: Learn its types, operations, advantages and disadvantages, and how it solves classic OS problems. Learn what is semaphore , how semaphores are used to manage concurrent processes, properties of semaphores , types of semaphores , with examples. History of Semaphores in Operating Systems When the Dutch computer scientist named Edsger Dijkstra and his team were designing an OS for the Electrologica X8, they devised the semaphore concept. And this technology happened to be known as THE multiprogramming system over time. Semaphore is simply a variable that is non-negative and shared between threads. A semaphore is a signaling mechanism, and a thread that is waiting on a semaphore can be signaled by another thread. It uses two atomic operations, 1) Wait, and 2) Signal for the process synchronization.
