def asynchronous():
	...
	return Asynchronous()


def function_2():
	return Event | Condition | Timeout | Asynchronous | Callback | ...
	
@asynchronous
def function_1():
	result = yield function_2(*arguments, **key_word_argument)
				   | - Event: Wait until event occurs and then continue
				   |          execution. Result will be the arguments passed to
				   |		  the event handler.
				   | - Condition: Wait until the condition becomes active and
				   |              continue execution after that. Result will be
				   |			  `None`.
				   | - Timeout: Wait until timeouts time delta is over and then
				   |            continue execution. Result will be `None`
				   | - Asynchronous: Wait until an other asynchronous function
				   |				 has finished and pass its result to result.
				   | - Callback: Wait until callback is called and pass the
				   |			 arguments to result.
				   | - ...: Every other Python object will be stored in the
				   |        asynchronous object's progress variable and could
				   |		be used to dispatch the progress of a certain task.