Joint Progress Diagram of Deadlock Q Release Deadlock is only inevitable if the Release Required B joint progress of Get A the two processes B deadlock creates a path that Get B enters the fatal region PI ess Get A Get B Release A Release B =both P and Q want resourceA =both P and Q want resource B Required = deadlock-inevitable region B Required th of P and Q eater-P-iexecuting and Q is waiting Vertical portion of path indicates Q is executing and P is waiting Figure 6.2 Example of Deadlock6 Joint Progress Diagram of Deadlock Deadlock is only inevitable if the joint progress of the two processes creates a path that enters the fatal region