Mutex In Cpp Threading | Why Use Mutex | What Is Race Condition And How To Solve It? | What Is Critical Section

Mutex In C++ Threading | Why Use Mutex | What Is Race Condition And How To Solve It? | What Is Critical Section

Mutex: Mutual Exclusion

RACE CONDITION:

0. Race condition is a situation where two or more threads/process happened to change a common data at the same time.

1. If there is a race condition then we have to protect it and the protected section is  called critical section/region.

MUTEX:

0. Mutex is used to avoid race condition.

1. We use lock() , unlock() on mutex to avoid race condition.

#include <iostream>

#include <thread>

#include <mutex>

using namespace std;

int myAmount = 0;

std::mutex m;

void addMoney() {

    m.lock();

    ++myAmount;

    m.unlock();

}

int main() {

    std::thread t1(addMoney);

    std::thread t2(addMoney);

    t1.join();

    t2.join();

    cout << myAmount << endl;

    return 0;

}