4.6. Consider the following history of six events in which operations span multiple ob- jects, assuming that A and B are initialized to 0: ev - inv(write(1)) on evz= inv(sum()) evs= resp(urite()) from A evA = inv(write(2)) on evs = resp(write()) from B evg = resp(sum(2)) from A, B at P A at P A, B at P at P at Ps at Ps on B Show that this history is not linearizable but normal.

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4.6. Consider the following history of six events in which operations span multiple ob-
jects, assuming that A and B are initialized to 0:
ev = inv(write(1)) on
evz = inv(sum()
evy = resp(urite()) from A
evA = inv(write(2)) on
evs = resp(write()) from B
evg = resp(sum(2)) from A, B at P
at P
А, В at Pa
at P
at P
at Ps
A
on
B
Show that this history is not linearizable but normal.
Transcribed Image Text:4.6. Consider the following history of six events in which operations span multiple ob- jects, assuming that A and B are initialized to 0: ev = inv(write(1)) on evz = inv(sum() evy = resp(urite()) from A evA = inv(write(2)) on evs = resp(write()) from B evg = resp(sum(2)) from A, B at P at P А, В at Pa at P at P at Ps A on B Show that this history is not linearizable but normal.
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