Embedded Software Engineer Question:
Please explain what is semaphore?
Answer:
Semaphore is actually a variable or abstract data type which controls access to a common resource by multiple processes. Semaphores are of two types -
☛ Binary semaphore – It can have only two values (0 and 1). The semaphore value is set to 1 by the process in charge, when the resource is available.
☛ Counting semaphore – It can have value greater than one. It is used to control access to a pool of resources.
☛ Binary semaphore – It can have only two values (0 and 1). The semaphore value is set to 1 by the process in charge, when the resource is available.
☛ Counting semaphore – It can have value greater than one. It is used to control access to a pool of resources.
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