3.2.1 哲人怎样发生死锁
当每个哲人都持有他自己的筷子并等待邻座的筷子变为可用时，会发生实际死锁：
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哲人 0 持有筷子 0，但等待筷子 1 |
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哲人 1 持有筷子 1，但等待筷子 2 |
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哲人 2 持有筷子 2，但等待筷子 3 |
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哲人 3 持有筷子 3，但等待筷子 4 |
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哲人 4 持有筷子 4，但等待筷子 0 |
在这种情况下，没有人可以吃，这些哲人处于死锁状态。多次重新运行该程序，您将看到该程序可能有时挂起，或有时运行直到完成。
运行哲人进餐程序，并查看它完成还是发生死锁。它可能挂起，如以下样例运行所示：
prompt% cc din_phil.c -mt prompt% a.out Philosopher 0 is done thinking and now ready to eat. Philosopher 2 is done thinking and now ready to eat. Philosopher 2: got right chopstick 2 Philosopher 2: got left chopstick 3 Philosopher 0: got right chopstick 0 Philosopher 0: got left chopstick 1 Philosopher 0: eating. Philosopher 4 is done thinking and now ready to eat. Philosopher 4: got right chopstick 4 Philosopher 2: eating. Philosopher 3 is done thinking and now ready to eat. Philosopher 1 is done thinking and now ready to eat. Philosopher 0: got right chopstick 0 Philosopher 3: got right chopstick 3 Philosopher 2: got right chopstick 2 Philosopher 1: got right chopstick 1 (hang) Execution terminated by pressing CTRL-C
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