GameMonkeyScript/gmsrc/doc/tutorial/2-continuing/scripts/blocking_04.gm

/*
  Basic blocking and signalling #4
*/

global blockfunc = function()
{
	print( "Waiting for instruction, sir!" );
	signal_received = block("attack", "move", "defend");
	if(signal_received == "attack")
	{
		print("Attacking!");
	}
	else if (signal_received == "move")
	{
		print("Moving to position!");
	}
	else if (signal_received == "defend")
	{
		print("Defending til the death!");
	}
};

thread( blockfunc );
sleep(1);
signal("attack");