以多线程及theading.Rlock,或者gevent加线程生成不可得重复的id

generate_many_cid.py

__author__ = 'Alec'

import threading
import time
import thread
import gevent


cids = []

_cid_rlock = threading.RLock()
def generate_cid():
    with _cid_rlock:
        return long((time.time()-1377964800.000000)*1000000000)


def generate_many_cid():
    for i in range(60):
        cids.append(generate_cid())


def main(): #Use thread.start_new_thread() to create 2 new threads
    # thread.start_new_thread(generate_many_cid, ())
    # thread.start_new_thread(generate_many_cid, ())
    # thread.start_new_thread(generate_many_cid, ())
    # thread.start_new_thread(generate_many_cid, ())
    gevent.joinall([
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
        gevent.spawn(generate_many_cid),
    ])

    time.sleep(5)
    print cids
    s_length = len(cids)
    print('S_Lenght: %s' % s_length)

    after = len(set(cids))
    print(' After_length: %s' % after)

    assert s_length == after

if __name__ == '__main__':
    main()