Operating System :: Process Management - Discussion

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Explanation:
The main disadvantage of the semaphore is that it requires busy waiting. While a process is in its critical section, any other process that tries to enter its critical section must loop continuosly in the entry code. This continual looping is clearly a problem in a real multiprogramming system, where a single CPU is shared among many processes. Busy waiting wastes CPU cycles that some other process might be able to use productively. This type of semaphore is also called a spin lock because the process "spins" while waiting for the lock.