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uasyncio_cancel_fair.py

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# Test fairness of cancelling a task

# That tasks which continuously cancel each other don't take over the scheduler

try:

import uasyncio as asyncio

except ImportError:

try:

import asyncio

except ImportError:

print("SKIP")

raise SystemExit

async def task(id, other):

for i in range(3):

try:

print("start", id)

await asyncio.sleep(0)

print("done", id)

except asyncio.CancelledError as er:

print("cancelled", id)

if other is not None:

print(id, "cancels", other)

tasks[other].cancel()

async def main():

global tasks

tasks = [

asyncio.create_task(task(0, 1)),

asyncio.create_task(task(1, 0)),

asyncio.create_task(task(2, None)),

]

await tasks[2]

asyncio.run(main())