读者作者问题的状态转换图 [英] State transition diagram for reader writer problem

问题描述

当教授说写标志和读标志时，我不理解他的意思. 0表示被触发吗? 他希望我们绘制一个状态转换图，但是如果我知道发生了什么，我想我可以自己做.

I'm not understanding my professor means when he says the write flag and read flag. Does 0 mean it is triggered? He wants us to draw a state transition diagram but I think I can do that myself if I knew what was going on.

+---------+------------+-----------+----------------+
| Counter | Write flag | Read flag | Interpretation |
+---------+------------+-----------+----------------+
| 0       | 0          | 0         | Write locked   |
| 0       | 0          | 1         | Invalid        |
| 0       | 1          | 0         | Invalid        |
| 0       | 1          | 1         | Available      |
| N       | 0          | 0         | Write request  |
| N       | 0          | 1         | Read locked    |
| N       | 1          | 0         | Invalid        |
| N       | 1          | 1         | Invalid        |
+---------+------------+-----------+----------------+

推荐答案

write标志和read标志均为布尔值，表示它可以容纳0或1.状态似乎由的值定义计数器和两个标志.我认为您的教授要求您绘制一个状态图，以显示不同计数器/标志值组合之间的转换. (我的猜测是，您要将所有counter> 0子状态折叠为一个标记为counter = N的单个子状态.)

The write flag and the read flag are each a boolean value, meaning it can hold a 0 or a 1. The state appears to be defined by the value of the counter and the two flags. I think your professor is asking that you draw a state diagram that shows transitions between different counter/flag value combinations. (My guess is that the intent is that you collapse all the counter>0 sub-states into a single sub-state labeled counter=N.)

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