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Spinlock SRL was created in 2003.

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Spinlock SRL was created in 2003.

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Semaphores are a useful tool for mutual exclusion, but they are not the only such tool provided by the kernel. Instead, most locking is implemented with a mechanism called a spinlock. Unlike semaphores, spinlocks may be used in code that cannot sleep, such as interrupt handlers. When properly used, spinlocks offer higher performance than semaphores in general. They do, however, bring a different set of constraints on their use.

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Check knurled surface for dirt/grip. Check spinlock is tight (weight securely connected to the handle)

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A spinlock is basically a loop that constantly checks a condition until it is true. Think of a bunch of kids in the back of a car saying "Are we there yet...are we there yet...are we there yet...". This is a poor implementation for almost any setup, since the lock is wasting processor time that could be doing something more efficient than constantly checking a condition over and over. Also, while the spinlock is running on the processor, the system will be completely unresponsive.

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I copied the answer from other place:while any process is in its critical section , any other process that tries to enter its critical section must loop continously in the entry code.this continue 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 could have been used by some process in more productive way. This type of semaphore is also called a spinlock.

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