晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/Demo/threads/Generator.py
# Generator implementation using threads

import sys
import thread

class Killed(Exception):
    pass

class Generator:
    # Constructor
    def __init__(self, func, args):
        self.getlock = thread.allocate_lock()
        self.putlock = thread.allocate_lock()
        self.getlock.acquire()
        self.putlock.acquire()
        self.func = func
        self.args = args
        self.done = 0
        self.killed = 0
        thread.start_new_thread(self._start, ())

    # Internal routine
    def _start(self):
        try:
            self.putlock.acquire()
            if not self.killed:
                try:
                    apply(self.func, (self,) + self.args)
                except Killed:
                    pass
        finally:
            if not self.killed:
                self.done = 1
                self.getlock.release()

    # Called by producer for each value; raise Killed if no more needed
    def put(self, value):
        if self.killed:
            raise TypeError, 'put() called on killed generator'
        self.value = value
        self.getlock.release()  # Resume consumer thread
        self.putlock.acquire()  # Wait for next get() call
        if self.killed:
            raise Killed

    # Called by producer to get next value; raise EOFError if no more
    def get(self):
        if self.killed:
            raise TypeError, 'get() called on killed generator'
        self.putlock.release()  # Resume producer thread
        self.getlock.acquire()  # Wait for value to appear
        if self.done:
            raise EOFError  # Say there are no more values
        return self.value

    # Called by consumer if no more values wanted
    def kill(self):
        if self.killed:
            raise TypeError, 'kill() called on killed generator'
        self.killed = 1
        self.putlock.release()

    # Clone constructor
    def clone(self):
        return Generator(self.func, self.args)

def pi(g):
    k, a, b, a1, b1 = 2L, 4L, 1L, 12L, 4L
    while 1:
        # Next approximation
        p, q, k = k*k, 2L*k+1L, k+1L
        a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
        # Print common digits
        d, d1 = a//b, a1//b1
        while d == d1:
            g.put(int(d))
            a, a1 = 10L*(a%b), 10L*(a1%b1)
            d, d1 = a//b, a1//b1

def test():
    g = Generator(pi, ())
    g.kill()
    g = Generator(pi, ())
    for i in range(10): print g.get(),
    print
    h = g.clone()
    g.kill()
    while 1:
        print h.get(),
        sys.stdout.flush()

test()

haha - 2025