61.0 Intro(3/6) rogress Release 绕 and Release Required et⊥ 3 B deadlock inevitable Required Get B 4 Fatal Region P has a, Q has B Deadlock!! Progress Get A Get B Release A Release B of p both Pand Q want resource A S=both Pand Q want resource B Required deadlock-inevitable region B Required possible progress path of P and Q Horizontal portion of path indicates Pis executing and Q is waiting Vertical portion of path indicates Pis executing and Q is waiting Figure 6.2 Example of Deadlock6.1.0 Intro(3/6) 7 Fatal Region P has A, Q has B Deadlock!!