gwaiter.py

class Waiter(list):
    def __init__(self):
        self.greenlets = []

    def spawn(self, func, *args, **kw):
        g = gevent.spawn(func, *args, **kw)
        self.greenlets.append(g)

    @property
    def results(self):
        for greenlet in self.greenlets:
            status = greenlet.successful()
            yield status, greenlet.value

    def __enter__(self):
        return self

    def __exit__(self, *args):
        if any(args):
            raise
        gevent.wait(self.greenlets)