[Database] Deadlock avoidance protocol

如何避免Deadlock，如果我们能提前知道各个Process对于资源的需求情况，我们就可以用Banker‘s algorithm （银行家算法) 来解决问题。可是这在现在中不好实现，因为很难提前知道对于资源的需求情况。此时可以用一下两种方法来解决问题。

1. Wait - die Protocol

2. Kill - wait Protocol

具体地，根据两个Process的创建时间，创建时间较早的，我们称之为Older Process (O)，较晚的那个称之为Yonger Process (Y)， 那么

Deadlock 　　Wait - die 　　Kill - wait

O requires a resource held by Y      O waits         O waits　　　　O dies

Y requires a resource held by O      Y waits   　　 Y dies   　　     Y waits

时间： 2024-08-13 03:28:09

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