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6. Initial value of shared variable m is equal to 0 and it is stored at memory address 1100. threads A, B, Y, Z use this variable as follows: Processes A and B increase the value of m by 1. Processes Y and Z decrease the value of m by 1. Since m is shared, each process protects the critical region using semaphore S initialized to 2. Write the sequence of operations so that after each thread is executed once, the value of m is equal to-2. assume the code is used S=2 Proses A A1: W(S) A2: LOAD m, 1100 A3: ADD 1 A4: MV A, 1100 A5: S(S) Proses B B1; W(S) B2: LOAD m, 1100 83: SUBT 1 B4: MV A, 1100 B5: S(S) Proses Y Y1: W(S) Y2: LOAD m, 1100 Y3: ADD 1 Y4: MV A, 1100 Y5: S(S) Proses 2 21: W(S) 22: LOAD m, 1100 23: SUBT 1 24: MV A, 1100 25:5(5)

6. Initial value of shared variable m is equal to 0 and it is stored at memory address 1100. threads A, B, Y, Z use this variable as follows: Processes A and B increase the value of m by 1. Processes Y and Z decrease the value of m by 1. Since m is shared, each process protects the critical region using semaphore S initialized to 2. Write the sequence of operations so that after each thread is executed once, the value of m is equal to-2. assume the code is used S=2 Proses A A1: W(S) A2: LOAD m, 1100 A3: ADD 1 A4: MV A, 1100 A5: S(S) Proses B B1; W(S) B2: LOAD m, 1100 83: SUBT 1 B4: MV A, 1100 B5: S(S) Proses Y Y1: W(S) Y2: LOAD m, 1100 Y3: ADD 1 Y4: MV A, 1100 Y5: S(S) Proses 2 21: W(S) 22: LOAD m, 1100 23: SUBT 1 24: MV A, 1100 25:5(5)

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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6. Initial value of shared variable m is equal to 0 and it is stored at memory address 1100. Four threads A, B, Y, Z use this variable as follows: Processes A and B increase the value of m by 1. Processes Y and Z decrease the value of m by 1. Since m is shared, each process protects the critical region using semaphore S initialized to 2. Write the sequence of operations so that after each thread is executed once, the value of m is equal to -2.3 assume the code is used S=2 Proses A A1: W(S) A2: LOAD m, 1100 A3: ADD 1 A4: MV A, 1100 A5: S(S) Proses B B1; W(S) B2: LOAD m, 1100 83: SUBT 1 B4: MV A, 1100 85: S(S) Proses Y Y1: W(S) Y2: LOAD m, 1100 Y3: ADD 1 Y4: MV A, 1100 Y5: S(S) Proses 2 21: W(S) 22: LOAD m, 1100 23: SUBT 1 24: MV A, 1100 25: S(S)
Transcribed Image Text:6. Initial value of shared variable m is equal to 0 and it is stored at memory address 1100. Four threads A, B, Y, Z use this variable as follows: Processes A and B increase the value of m by 1. Processes Y and Z decrease the value of m by 1. Since m is shared, each process protects the critical region using semaphore S initialized to 2. Write the sequence of operations so that after each thread is executed once, the value of m is equal to -2.3 assume the code is used S=2 Proses A A1: W(S) A2: LOAD m, 1100 A3: ADD 1 A4: MV A, 1100 A5: S(S) Proses B B1; W(S) B2: LOAD m, 1100 83: SUBT 1 B4: MV A, 1100 85: S(S) Proses Y Y1: W(S) Y2: LOAD m, 1100 Y3: ADD 1 Y4: MV A, 1100 Y5: S(S) Proses 2 21: W(S) 22: LOAD m, 1100 23: SUBT 1 24: MV A, 1100 25: S(S)
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