import functools
from threading import Thread

def threaded(fn):
    """Decorator to automatically launch a function in a thread"""
    @functools.wraps(fn)
    def wrapper(*args, **kwargs):
        thread = Thread(target=fn, args=args, kwargs=kwargs)
        thread.start()
        return thread
    return wrapper

def singleton(cls):
    instances = {}
    def getinstance(*args, **kwargs):
        if cls not in instances:
            instances[cls] = cls(*args, **kwargs)
        return instances[cls]
    return getinstance