/******************************************************************************
 *
 *                      P S E U D O   C O D E
 *
 ******************************************************************************

//global variables:

curr  // pointer to currently running process
ready_queue  // header for the jobs waiting to run....


	main() 
	{
		char ss1[STACK_SIZE], ss2[STACK_SIZE], ss3[STACK_SIZE];
		start_thread( function_1, NULL, &ss1 );  // create a thread that will run function_1
		start_thread( function_2, NULL, &ss2 );
		start_thread( function_3, NULL, &ss3 );
		run(); // all the threads start running, this call never returns
	}

	start_thread(function, argv, ss) // keep argv NULL
	{
	    if ready_queue not initialized  -- InitQueue(ready_queue); // or do it in main.
		pcb = malloc();
		init_context( pcb, function, ss );
		enQueue( ready_queue, pcb );
	}

	run()  // only called once, from main
	{
		
		getcontext( parent );
		curr = dequeue( ready_queue );
		swapcontext( parent, &curr->context );
	}

	void yield() // switch to another thread
        {
		next = deQueue( run_queue );
		prev = curr; 
		curr = next;
		enQueue( run_queue, prev);
		swapcontext( prev->context, next->context ); // the actual context switch
	}


	enQueue( ... ) 
	{
		...
	}
	deQueue( ... )
	{
		...
	}
	InitQueue( ... )
	{
		...
	}

	function_1( ... ) 
	{
		...
	}
		...
*/