Question: Using the progress graph in Figure 12.21, classify the following trajectories as either safe or unsafe. Figure 12.21 A. H, L1, U, S1, H2, L2,

Using the progress graph in Figure 12.21, classify the following trajectories as either safe or unsafe.

A. H, L1, U, S1, H2, L2, U2, S2, T2, T1 B. H, L2, H, L1, U1, S1, T1, U2, S2, T2 C. H, H, L2, U2, S2, L, U, S,

Figure 12.21

Critical section wrt cnt Thread 2 T Safe trajectory S U L H H Unsafe region 4 U S Critical section wrt cnt T

A. H, L1, U, S1, H2, L2, U2, S2, T2, T1 B. H, L2, H, L1, U1, S1, T1, U2, S2, T2 C. H, H, L2, U2, S2, L, U, S, T1, T

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