#include <pthread.h>
#include <stdio.h>

// Name:	simple_thread
// Purpose:	strange way of computing the square of a number
void * simple_thread(void *param)
{
	int x, y, inc;
	x = (int)param;
	y = x;
	inc = x;

	printf("\n\n");
	printf("  &param = %x\n",&param);
	printf("  &inc = %x\n",&inc);
	printf("  x = %i, y = %i\n",x,y);
	sleep(2);
	printf("  &x = %x, &y = %x\n",&x,&y);
	
	while (y > 1)
	{
		x += inc;
		y--;
		//printf("  x = %i, y = %i\n",x,y);
	}
	printf("\nThread exiting!!!\n");
	return (void *)x;
}

// Name:	main
// Purpose:	create child threads to perform computations
int main()
{
	int status;
	pthread_t id, id1, id2;

	void *paramPtr;
	int param;
	void **retVal;

	paramPtr = &param;	
	
	// Create a child thread...
	param = 5;
	status = pthread_create(&id1, NULL, simple_thread, (void *)param);
	// Join on a thread...
	id = id1;
	status = pthread_join(id, retVal);
	printf("\n Return value (id = %i) = %i\n\n", id, *retVal);
	
	// Create a child thread...
	param = 7;
	status = pthread_create(&id2, NULL, simple_thread, (void *)param);
	// Join on a thread...
	id = id2;
	status = pthread_join(id, retVal);
	printf("\n Return value (id = %i) = %i\n\n", id, *retVal);
	
	return 0;
}