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Three types of semaphores:

1.General/Counting semaphores:

(can take any non-negative value)

These are used when you might have multiple devices (like 3 printers or multiple memory buffers).

2.Binary semaphores:

(can either be 0 or 1)

These are used to gain exclusive access to a single resource (like the serial port, a non-reentrant library routine, or a hard disk drive). A counting semaphore that has a maximum value of 1 is equivalent to a binary semaphore (because the semaphore's value can only be 0 or 1).

3.Mutex semaphores:

These are optimized for use in controlling mutually exclusive access to a resource. There are several implementations of this type of semaphore.

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Q: What are the types of semaphores?
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