If we add a semaphore shared between P1 and P2 and change the pseudocode to the following one. What will be the final value of s? const int n=10; int s; // shared variable between two processes (threads) semaphore m=1; void P1( ) { int i=0; for (i=0;i
If we add a semaphore shared between P1 and P2 and change the pseudocode to the following one. What will be the final value of s? const int n=10; int s; // shared variable between two processes (threads) semaphore m=1; void P1( ) { int i=0; for (i=0;i
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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![If we add a semaphore shared between P1 and P2 and change the pseudocode to the
following one. What will be the final value of s?
const int n=10;
int s;
// shared variable between two processes (threads)
semaphore m=1;
void P1( )
{
int i=0;
for (i=0;i<n, i++) {
semwait (m) ;
s+=i;
semSignal (m);
}
void P2()
{
int i=0;
for (i=0; i<n; i++) {
semWait (m):
s-=i;
semSignal (m);
}
}
void main ()
{
s=0;
Parbegin (Pl, P2);
//start two processes (threads)
Printout s;](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F69d8d3fb-3043-4b6d-bfd4-ef3b26ceb288%2F94677324-fe77-4b26-9bcd-c10f3f7fd257%2Fk05u7fb_processed.png&w=3840&q=75)
Transcribed Image Text:If we add a semaphore shared between P1 and P2 and change the pseudocode to the
following one. What will be the final value of s?
const int n=10;
int s;
// shared variable between two processes (threads)
semaphore m=1;
void P1( )
{
int i=0;
for (i=0;i<n, i++) {
semwait (m) ;
s+=i;
semSignal (m);
}
void P2()
{
int i=0;
for (i=0; i<n; i++) {
semWait (m):
s-=i;
semSignal (m);
}
}
void main ()
{
s=0;
Parbegin (Pl, P2);
//start two processes (threads)
Printout s;
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