Regarding the bounded buffer version of the producer-consumer problem: If the buffer is full, the consumer must wait until new data is generated. Regarding the unbounded buffer version of the producer-consumer problem: the producer never has to wait and can produce new data elements without having to care for buffer sizes. With respect to the first readers-writers-problem discussed in class: If new reading processes are added again and again, a writing process could starve in the worst case. With respect to the solution to the second readers-writers-problem discussed in class: the queue semaphore provides a queuing of read and write processes. The naïve semaphore-based solution to the Dining-Philosophers problem discussed in class can lead to deadlocks. The semaphore-based solution to the Dining-Philosophers problem discussed in class is limited to at most 5 philosopher processes.

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