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"""
Uses a trace function to switch greenlets at unexpected times.
In the trace function, we switch from the current greenlet to another
greenlet, which switches
"""
import greenlet
g1 = None
g2 = None
switch_to_g2 = False
def tracefunc(*args):
print('TRACE', *args)
global switch_to_g2
if switch_to_g2:
switch_to_g2 = False
g2.switch()
print('\tLEAVE TRACE', *args)
def g1_run():
print('In g1_run')
global switch_to_g2
switch_to_g2 = True
greenlet.getcurrent().parent.switch()
print('Return to g1_run')
print('Falling off end of g1_run')
def g2_run():
g1.switch()
print('Falling off end of g2')
greenlet.settrace(tracefunc)
g1 = greenlet.greenlet(g1_run)
g2 = greenlet.greenlet(g2_run)
g1.switch()
print('Falling off end of main')
g2.switch()