He cannot pick up a fork already held by a neighbour. While he's eating, he holds the forks without releasing them, and when he's done he puts the forks down and starts thinking again. Philosopher 1 can eat only with forks 0 and 1 . Philosopher 5 can eat only with forks 4 and 0 . This happens when each philosopher has one fork, and wants another.
Clients send messages requesting semaphore waits and signals.
When the client wants to claim a semaphore, it waits for a response from the server. The server withholds the response until the semaphore is available. Each client is a philosopher, and we have one semaphore per fork. When the client is finished, it sends the message DIED . Once all the clients are dead, the server dies too.