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Semaphores and Precedence Constraints. The following pair of processes shares a common variable X. Statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. shared var X: integer = 5; {initialized to 5} Process A Process B int Y; int Z; A1: Y= X* 2; X = Y A2: В1: Z-D X+13; B2: X = Z; Determine the value of X when statements from A and B are interleaved with the following sequence of execution:

Semaphores and Precedence Constraints. The following pair of processes shares a common variable X. Statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. shared var X: integer = 5; {initialized to 5} Process A Process B int Y; int Z; A1: Y= X* 2; X = Y A2: В1: Z-D X+13; B2: X = Z; Determine the value of X when statements from A and B are interleaved with the following sequence of execution:

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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1) Order of execution: A1 A2 B1 B2
a. 11

b. 10

c. 5

d. 6

      
2) Order of execution: B1 A1 B2 A2

a. 11

b. 20

c. 10

d. 6

Semaphores and Precedence Constraints. The following pair of processes shares a common variable X. Statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. shared var X: integer = 5; {initialized to 5} Process A Process B int Y; int Z; A1: Y= X* 2; X = Y A2: В1: Z-D X+13; B2: X = Z; Determine the value of X when statements from A and B are interleaved with the following sequence of execution:
Transcribed Image Text:Semaphores and Precedence Constraints. The following pair of processes shares a common variable X. Statements within a process are executed sequentially, but statements in process A may execute in any order with respect to statements in process B. shared var X: integer = 5; {initialized to 5} Process A Process B int Y; int Z; A1: Y= X* 2; X = Y A2: В1: Z-D X+13; B2: X = Z; Determine the value of X when statements from A and B are interleaved with the following sequence of execution:
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