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

using namespace std ;

mutex gmutex ;

void thread_function1( int id )
{

    for( int i1=1 ; i1<=5 ; i1++ )
     {
		//TO DO Use a unique lock  instead
		gmutex.lock() ;
        cout << "Thread id: " << id << " i1:" <<
          i1 << endl ;
        gmutex.unlock() ;
	 }

}

int main()
{
	//TO DO Create 3 threads that all call "thread_function1"
	//at the same time. Pass the id's of 1 , 2 and 3 to the
	//function
    thread t1( &thread_function1, 1 ) ;
    thread t2( &thread_function1, 2 ) ;
    thread t3( &thread_function1, 3 ) ;


    //Have the 3 threads join in the main
    t1.join() ;
    t2.join() ;
    t3.join() ;

    cout << "main thread\n" ;
    return 0;
}