project 1 C++ if you can do it contact me read the attachment

Use Word to process your homework and submit to Blackboard is mandatory. Source code and screenshot are required.

1. Objectives

· Understand the race condition

· Know the multithreading programming

· Understand how to use mutex to solve the race condition

2. Run the following code and explain what the code does

· Run this code at least twice and take screenshots

· Explain what the code does

· What is the running result supposed to be

· What caused this issue?

#include <thread>

#include <iostream>

using namespace std;

const unsigned int NTHREADS = 20;

const int ITERS = 10000000;

int counter;

void increment()

{

for (int i = 0; i < ITERS; i++)

counter++;

}

void decrement()

{

for (int i = 0; i<ITERS; i++)

counter--;

}

int main()

{

cout << "The counter is " << counter << endl;

thread *threads = new thread[NTHREADS];

for (unsigned int i = 0; i<NTHREADS; i++)

if (i % 2 == 0)

threads[i] = thread(increment);

else

threads[i] = thread(decrement);

for (unsigned int i = 0; i<NTHREADS; i++)

threads[i].join();

cout << "The counter is " << counter << endl;

return 0;

}

3. Mutex

A mutex (mutual exlusion) allows us to encapsulate blocks of code that should only be executed in one thread at a time.

Apply mutex to solve the issue in previous code. Show your revised code and running result.