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Seems like a contradiction because a semaphore should block to function.
Internet searches do not show up anything useful towards defining what this means.
If a semaphore has the value 0, a down operation on it will block until someone releases a resource and increments the semaphore.
A non-blocking semaphore does not block on a down operation if the resource is unavailable, but rather yields an error. This can be useful if the program needs that resource immediately or without suspending execution, and if the resource isn’t available, the program logic can rather do something else.