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What are semaphores?

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โˆ™ 2006-07-08 22:19:50

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Click on the link to your right for the answer. Signaling devices, typically to give permission to go ahead or to stop, but can also have other meanings. On a rail line, a lifted green flag can be the semaphore that means to go ahead. Traffic lights are a kind of semaphore. In computer RS232 communication lines the RTS and CTS lines are sometimes called semaphores.

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โˆ™ 2006-07-08 22:19:50
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There are a number of ways the word semaphores might be used in a sentence. The definition of this word is that it is a system of sending messages using a series of flags in certain positions, signifying different messages with several meanings.


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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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