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Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and 'Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 ti0 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 3) Construct a schedule (which is different from above) of these five transactions which causes deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why. 4) Construct a schedule (which is different from above) of these five transactions which does not cause deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in vour schedule. If no such schedule exists explain why.

Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and 'Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 ti0 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 3) Construct a schedule (which is different from above) of these five transactions which causes deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why. 4) Construct a schedule (which is different from above) of these five transactions which does not cause deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in vour schedule. If no such schedule exists explain why.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and 'Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 ti0 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 3) Construct a schedule (which is different from above) of these five transactions which causes deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why. 4) Construct a schedule (which is different from above) of these five transactions which does not cause deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why.
Transcribed Image Text:Consider the schedule below. Here, R(*) and W(*) stand for 'Read' and 'Write', respectively. T1, T2, T3, T4 and T5 represent five transactions and ti represents a time slot. ti t2 t3 t4 t5 t6 t7 t8 t9 ti0 t11 t12 t13 t14 t15 t16 t17 t18 T1 R(A) R(B) W(A) W(B) T2 R(C) W(C) T3 R(B) R(C) W(B) W(C) T4 R(D) W(D) R(A) W(A) T5 R(C) R(A) W(C) W(A) Each transaction begins at the time slot of its first Read and commits right after its last Write (same time slot). Regarding the following questions, give and justify your answers. 3) Construct a schedule (which is different from above) of these five transactions which causes deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why. 4) Construct a schedule (which is different from above) of these five transactions which does not cause deadlock when using two-phase locking protocol. You should clearly indicate all the locks and the corresponding unlocks in your schedule. If no such schedule exists, explain why.
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