File: mutex.cpp

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#include <mutex>
#include <thread>
#include <iostream>

std::mutex lock;

int g_counter = 0;

void foo() {
    for (int i = 0; i < 10000; ++i) {
        std::lock_guard<std::mutex> g(lock);
        ++g_counter;
    }
    return;
}

int main() {
    std::thread t1(foo);
    std::thread t2(foo);
    std::thread t3(foo);
    foo();
    t1.join();
    t2.join();
    t3.join();
    std::cout << g_counter << std::endl;
    return 0;
}