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tractor/examples/debugging/shield_hang_in_sub.py

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Python

'''
Verify we can dump a `stackscope` tree on a hang.
'''
import os
import signal
import trio
import tractor
@tractor.context
async def start_n_shield_hang(
ctx: tractor.Context,
):
# actor: tractor.Actor = tractor.current_actor()
# sync to parent-side task
await ctx.started(os.getpid())
print('Entering shield sleep..')
with trio.CancelScope(shield=True):
await trio.sleep_forever() # in subactor
# XXX NOTE ^^^ since this shields, we expect
# the zombie reaper (aka T800) to engage on
# SIGINT from the user and eventually hard-kill
# this subprocess!
async def main(
from_test: bool = False,
) -> None:
async with (
tractor.open_nursery(
debug_mode=True,
enable_stack_on_sig=True,
# maybe_enable_greenback=False,
loglevel='devx',
) as an,
):
ptl: tractor.Portal = await an.start_actor(
'hanger',
enable_modules=[__name__],
debug_mode=True,
)
async with ptl.open_context(
start_n_shield_hang,
) as (ctx, cpid):
_, proc, _ = an._children[ptl.chan.uid]
assert cpid == proc.pid
print(
'Yo my child hanging..?\n'
'Sending SIGUSR1 to see a tree-trace!\n'
)
# XXX simulate the wrapping test's "user actions"
# (i.e. if a human didn't run this manually but wants to
# know what they should do to reproduce test behaviour)
if from_test:
os.kill(
cpid,
signal.SIGUSR1,
)
# simulate user cancelling program
await trio.sleep(0.5)
os.kill(
os.getpid(),
signal.SIGINT,
)
else:
# actually let user send the ctl-c
await trio.sleep_forever() # in root
if __name__ == '__main__':
trio.run(main)