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

using namespace std ;

recursive_mutex recursiveMutex ;
int shared_resource = 0;

void recursiveFunction(int depth)
{
    if (depth <= 0) {
        return;
    }

    recursiveMutex.lock(); // Acquire the lock
    cout << "Thread " << this_thread::get_id() << " acquired lock at depth " << depth << endl;

    shared_resource++; // Access shared resource

    recursiveFunction(depth - 1); // Recursive call, re-acquiring the lock

    cout << "Thread " << this_thread::get_id() << " releasing lock at depth " << depth << endl;
    recursiveMutex.unlock(); // Release the lock
}

int main()
{
    thread t1(recursiveFunction, 2);
    thread t2(recursiveFunction, 2);

    t1.join();
    t2.join();

    cout << "Final shared_resource value: " << shared_resource << endl;

    return 0;
}