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线程函数r
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gphil_state5哲学家状态（思考、等待、吃饭）r
boolstick5筷子的状态（有没有人正在使用）r
临界区结构变量r
CRITICAL_SECTIONcrout保证输出时不会竞争r
CRITICAL_SECTIONchopsticks5定义五个临界变量，代表五根筷子r
线程函数r
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