Hello! I am having issues undertanding the code in the picture. I am mosly interested on an explantion on how strict alternation is implemented in the while loop followed by the if else. I am sending here all the code but I just need help for what is the inside of myFunction at the begining (see image). Thank you! #include #include #include int count; int turn = 0; // Shared variable used to implement strict alternation void* myFunction(void* arg) { int actual_arg = ((int ) arg); for (unsigned int i = 0; i < 10; ++i) { while (turn != actual_arg); // Beginning of the critical region count++; std::cout << "Thread #" << actual_arg << " count = " << count << std::endl; //End of the critical region if (actual_arg == 0) { turn = 1; } else { turn = 0; } } // Random wait - This code is just to ensure that the threads // show data sharing problems int max = rand() % 100000; for (int x = 0; x < max; x++); // End of random wait code pthread_exit(NULL); } // HINT: It is not necessary to make any changes in main() int main() { int rc[2]; pthread_t ids[2]; int args[2]; count = 0; for(unsigned int i = 0; i < 2; ++i) { args[i] = i; rc[i] = pthread_create(&ids[i], NULL, myFunction, (void*) &args[i]); } for(unsigned int i = 0; i < 2; ++i) { pthread_join(ids[i], NULL); } std::cout << "Final count = " << count << std::endl; pthread_exit(NULL); }

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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Hello!

I am having issues undertanding the code in the picture. I am mosly interested on an explantion on how strict alternation is implemented in the while loop followed by the if else. I am sending here all the code but I just need help for what is the inside of myFunction at the begining (see image). Thank you!
#include <iostream>
#include <pthread.h>
#include <stdlib.h>

int count;
int turn = 0; // Shared variable used to implement strict alternation

void* myFunction(void* arg) {
int actual_arg = *((int *) arg);

for (unsigned int i = 0; i < 10; ++i) {
while (turn != actual_arg);
// Beginning of the critical region
count++;
std::cout << "Thread #" << actual_arg << " count = " << count << std::endl;
//End of the critical region
if (actual_arg == 0) {
turn = 1;
} else {
turn = 0;
}
}
// Random wait - This code is just to ensure that the threads
// show data sharing problems
int max = rand() % 100000;

for (int x = 0; x < max; x++);

// End of random wait code
pthread_exit(NULL);
}

// HINT: It is not necessary to make any changes in main()
int main()
{
int rc[2];
pthread_t ids[2];
int args[2];

count = 0;
for(unsigned int i = 0; i < 2; ++i) {
args[i] = i;
rc[i] = pthread_create(&ids[i], NULL, myFunction, (void*) &args[i]);
}

for(unsigned int i = 0; i < 2; ++i) {
pthread_join(ids[i], NULL);
}

std::cout << "Final count = " << count << std::endl;
pthread_exit(NULL);
}

void* myFunction(void* arg) {
int actual_arg = *((int *) arg);
for (unsigned int i = 0; i < 10; ++i) {
while (turn != actual_arg);
}
// Beginning of the critical region
count++;
std::cout << "Thread #" << actual_arg << " count =
//End of the critical region
if (actual_arg == 0) {
turn = 1;
} else {
}
turn = 8;
<< count << std::endl;

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