Greenlet vs yield python

Greenlet vs yield 利用 yield 或 Greenlet 來改變 process 的執行順序

import time
from greenlet import greenlet

class Recorder:

    def __init__(self):
     self._rec = []

    def push(self, data):
     self._rec.append(data)

    def pop(self):
     rst = self._rec[-1] if len(self._rec) != 0 else None
     return rst

    def clear(self):
 del self._rec[:]

    def __repr__(self):
     return repr(self._rec)

rec = Recorder()

def event(i):
    rec.append(i)

def tasklet_test_0(event):
    """ tasklet test0 """
    rec.push(0)
    event[1].switch(event)

def tasklet_test_1(event):
    """ tasklet test1 """
    rec.push(1)
    event[0].switch(event)

def tasklet_switch():
    """ tasklet switch """
    rec.clear()
    start_time = time.time()
    gr0 = greenlet(tasklet_test_0)
    gr1 = greenlet(tasklet_test_1)
    event = [gr0, gr1]
    event[0].switch(event)
    print repr(rec)
    print time.time() - start_time

def yield_test_0():
    rec.push(0)

def yield_test_1():
    rec.push(1)

def yield_test(event):
    """ list all sequence process in here """
    m = yield None

    while True:
 if m == "event0":
     print "receive send %s" %(m)
     m = yield event[0]() # to event 0
     elif m == "event1":
         print "receive send %s" %(m)
         m = yield event[1]() # to event 1
 else:
     print "receive send %s" %(m)
     m = yield None

def yield_switch():
    """ yield switch """
    rec.clear()
    start_time = time.time()
    event = [yield_test_0, yield_test_1]
    iters = yield_test(event)
    iters.next() # run event and stop iter on it
    iters.send("event2")
    iters.send("event1")
    iters.send("event0")
    iters.send("stop")
    print repr(rec)
    print time.time() - start_time

def main():
    tasklet_switch()
    yield_switch()

if __name__=='__main__':
    main()

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ref:
http://sdiehl.github.com/gevent-tutorial/ http://stackoverflow.com/questions/8960747/stackless-in-pypy-and-pypy-greenlet-differences
http://stackoverflow.com/questions/4263059/python-erlang-whats-the-difference-between-twisted-stackless-greenlet-event