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What is a semaphore, why is it needed? Name and describe three types of security threat. You are going to visit your friend in a

What is a semaphore, why is it needed?

Name and describe three types of security threat.

  1. You are going to visit your friend in a part of London you have never visited before. On leaving the nearest station, you pull out your phone to find the way to your friend's house. Describe the technologies that enable you to find the right route.

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1 A semaphore is a highlevel programming concept which is used to restrict the number of threads tha... blur-text-image

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