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#!/usr/bin/env python
"""Create a chain of coroutines and pass a value from one end to the other,
where each coroutine will increment the value before passing it along.
"""
import optparse
import time
import greenlet
def link(next_greenlet):
value = greenlet.getcurrent().parent.switch()
while True:
next_greenlet.switch(value + 1)
def chain(n):
start_node = greenlet.getcurrent()
for i in xrange(n):
g = greenlet.greenlet(link)
g.switch(start_node)
start_node = g
return start_node.switch(0)
if __name__ == '__main__':
p = optparse.OptionParser(
usage='%prog [-n NUM_COROUTINES]', description=__doc__)
p.add_option(
'-n', type='int', dest='num_greenlets', default=100000,
help='The number of greenlets in the chain.')
options, args = p.parse_args()
if len(args) != 0:
p.error('unexpected arguments: %s' % ', '.join(args))
start_time = time.clock()
print 'Result:', chain(options.num_greenlets)
print time.clock() - start_time, 'seconds'
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