wait for

Wait-for graph

A Wait-For Graph in computer science is a directed graph used for deadlock detection in operating systems and relational database systems.

In Computer Science, a system that allows concurrent operation of multiple processes and locking of resources and which does not provide mechanisms to avoid or prevent deadlock must support a mechanism to detect deadlocks and an algorithm for recovering from them.

One such deadlock detection algorithm makes use of a Wait-For Graph to track which other processes a process is currently blocking on. In a Wait-for Graph, processes are represented as nodes, and an edge from process P_i to P_j implies P_j is holding a resource that P_i needs and thus P_i is waiting for P_j to release its lock on that resource.


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