61.0 Intro(4/6) Progress f Q Release Release Required Get A and Required Get B Progress Geta Release A Get B Release B =both P Q want resource A A Required B Required both P and Q want resource B possible progress path of P and Q Horizontal portion of path indicates P is executing and Q is waiting Vertical portion of path indicates P is executing and Q is waiting Figure 6.3 Example of No Deadlock [BACO03]6.1.0 Intro(4/6) 8