6) The following program is executed by 2 processes p and q concurrently for i = 1; i <= 3; i++ x = x + 1 The variable x is shared by the two processes. • The instruction x = x + 1 is compiled into 3 machine instructions to load x into a register, increment the register value, and store the register back into x. If x is initially 0, determine the expected value of x when both p and q terminate. 7) Modify the solution to the CS problem by reversing the will_wait assignment: p1 sets will_wait = 2 and p2 sets will_wait = 1. Thus each process, rather than expressing willingness to wait, states that the other process should wait if necessary. Which of the 4 requirements will be violated?
6) The following program is executed by 2 processes p and q concurrently for i = 1; i <= 3; i++ x = x + 1 The variable x is shared by the two processes. • The instruction x = x + 1 is compiled into 3 machine instructions to load x into a register, increment the register value, and store the register back into x. If x is initially 0, determine the expected value of x when both p and q terminate. 7) Modify the solution to the CS problem by reversing the will_wait assignment: p1 sets will_wait = 2 and p2 sets will_wait = 1. Thus each process, rather than expressing willingness to wait, states that the other process should wait if necessary. Which of the 4 requirements will be violated?
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
Problem 1PE
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In the context of
Transcribed Image Text:6) The following program is executed by 2 processes p and q concurrently
for i = 1; i <= 3; i++
x = x + 1
The variable x is shared by the two processes.
The instruction x = x + 1 is compiled into 3 machine instructions to load x into a register,
increment the register value, and store the register back into x.
If x is initially 0, determine the expected value of x when both p and q terminate.
7) Modify the solution to the CS problem by reversing the will_wait assignment: p1 sets will_wait = 2
and p2 sets will_wait = 1. Thus each process, rather than expressing willingness to wait, states that
the other process should wait if necessary.
Which of the 4 requirements will be violated?
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