Serial Execution of program Serial execution characteristics Sequence(顺序)、 isolate(独立 recurrence(再现) Concurrence execution characteristics discontinuity, no-isoloate, no-recurrence ☆ Bernstein condition R(D和P2WPnR(PWPD∩WP2)= PROCESSES AND SCHEDULINGPROCESSES AND SCHEDULING Serial Execution of Program ❖ Serial execution characteristics ٭ Sequence （ 顺 序 ） 、 isolate （ 独 立 ） 、 recurrence（再现） ❖Concurrence execution characteristics ٭ discontinuity、no-isoloate、no-recurrence ❖Bernstein condition R(P1) ∩W(P2)∪W(P1) ∩R(P2)∪W(P1) ∩W(P2) = {Φ}