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

using namespace std ;

mutex mutex1 ;
mutex mutex2 ;

void thread_function1()
{
   cout << "Enter Thread function1: " << endl ;
   mutex1.lock() ;
   this_thread::sleep_for(chrono::milliseconds(1000));
   mutex2.lock() ;
   mutex1.unlock() ;
   mutex2.unlock() ;
   cout << "Exiting Thread function1: " << endl ;
}

void thread_function2()
{
   cout << "Enter Thread function2: " << endl ;
   mutex2.lock() ;
   this_thread::sleep_for(chrono::milliseconds(1000));
   mutex1.lock() ;

   mutex2.unlock() ;
   mutex1.unlock() ;
   cout << "Exiting Thread function2: " << endl ;
}


int main()
{
    thread t1( &thread_function1 );   // t1 starts running
    thread t2( &thread_function2 );   // t2 starts running
    //cout << "main thread\n";

    // main thread waits for the thread t1 to finish
    t1.join();
    t2.join();



    return 0;
}