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| Current File : //opt/hc_python/lib/python3.12/site-packages/greenlet/tests/fail_switch_three_greenlets.py |
"""
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
from_parent = greenlet.getcurrent().parent.switch()
print('Return to g1_run')
print('From parent', from_parent)
def g2_run():
#g1.switch()
greenlet.getcurrent().parent.switch()
greenlet.settrace(tracefunc)
g1 = greenlet.greenlet(g1_run)
g2 = greenlet.greenlet(g2_run)
# This switch didn't actually finish!
# And if it did, it would raise TypeError
# because g1_run() doesn't take any arguments.
g1.switch(1)
print('Back in main')
g1.switch(2)