[multithreading] What is a semaphore?

@Craig:

A semaphore is a way to lock a resource so that it is guaranteed that while a piece of code is executed, only this piece of code has access to that resource. This keeps two threads from concurrently accesing a resource, which can cause problems.

This is not restricted to only one thread. A semaphore can be configured to allow a fixed number of threads to access a resource.

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