Test for gevent sleep bug (affects 0.13, not 1.0)

gevent_sleep.py

"""
Test for gevent sleep bug (affects 0.13, not 1.0)

discussed in https://github.com/ipython/ipython/issues/2309
"""

import time
import gevent

def sleeper(duration):
    tic = time.time()
    gevent.sleep(duration)
    toc = time.time()
    print "gevent.slept %.1f/%.1fs" % (toc-tic, duration)
    return duration

def do_run():
    # gevent.sleep(0) # uncomment this to get expected behavior
    g1 = gevent.spawn(sleeper, 2) # will be max(2-1.5, 0.2) = 0.5
    g2 = gevent.spawn(sleeper, 1) # will be max(1 - 1.5, 0.2) = 0.2
    gevent.sleep(0.2) # this gets counted as well
    gevent.joinall((g1,g2))

do_run()
print "time.sleeping 0.5s"
time.sleep(0.5)
do_run()
print "time.sleeping 1.0s"
time.sleep(1.0)
do_run()
print "time.sleeping 1.5s"
time.sleep(1.5)
do_run()