#include <iostream.h>

#include <thread.h>
#include <mutex.h>



const int LOOPS = 10;

Mutex mutex1, mutex2;

class Daughter :public Thread {
public:
  Daughter(){}

protected:
  void Run(void) {
    for(int i=0; i < LOOPS; i++ ) {
      cout << "Daughter trying lock" << endl;
      mutex1.P();
      cout << "This is the daughter :" << endl;
      mutex2.V();
      cout << "Daughter removed lock :" << endl;
    }  
  }
};

class Mother : public Thread {
public:
  Mother() { }

protected:
  void Run(void) {
    Daughter daughter;
    daughter.Start();
    for( int i=0; i < LOOPS; i++)
      {
	cout << "Mother trying lock" << endl;
	mutex2.P();
	cout << "This is the mother :"<< endl;
	mutex1.V();
	cout << "Mother just unlocked :"<< endl;
      }
  }

};

int main(void)
{

  int retval;
  retval = mutex2.P();
  Mother mother;
  mother.Start();

  Thread::Join(&mother);

  return 0;
}