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There are four concurrent processes W, X, Y and Z sequence. All have a shared variable 'c'. W and X work as follow reads c from memory, increment by one, store c in memory. Y and Z work as follow reads c from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore s = 1, what is the maximum value of c after all four processes complete execution? Select one: a. 2 b. -2 c. 1 d. -1

There are four concurrent processes W, X, Y and Z sequence. All have a shared variable 'c'. W and X work as follow reads c from memory, increment by one, store c in memory. Y and Z work as follow reads c from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore s = 1, what is the maximum value of c after all four processes complete execution? Select one: a. 2 b. -2 c. 1 d. -1

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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There are four concurrent processes W, X, Y and Z sequence. All have a shared variable 'c'. W and X work as follow reads c from memory, increment by one, store c in memory. Y and Z work as follow reads c from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore s = 1, what is the maximum value of c after all four processes complete execution? Select one: a. 2 b. -2 c. 1 d. - 1
Transcribed Image Text:There are four concurrent processes W, X, Y and Z sequence. All have a shared variable 'c'. W and X work as follow reads c from memory, increment by one, store c in memory. Y and Z work as follow reads c from memory, decrement by two, stores into memory. Each process of the four call wait on semaphore s before reading, and calls signal after storing. If semaphore s = 1, what is the maximum value of c after all four processes complete execution? Select one: a. 2 b. -2 c. 1 d. - 1
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