What is semaphore?

Semaphore is a hardware or software flag. It is facility provided by operating system. In multitasking systems, a semaphore is a variable with a value that indicates the status of a common resource. It’s used to lock the resource that is being used. A process needing the resource checks the semaphore to determine the resource’s status and then decides how to proceed.

July 4, 2008 | Filed Under Embedded 

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