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# Test fairness of scheduler
try:
import asyncio
except ImportError:
print("SKIP")
raise SystemExit
async def task(id, t):
print("task start", id)
while True:
if t > 0:
print("task work", id)
await asyncio.sleep(t)
async def main():
t1 = asyncio.create_task(task(1, -0.01))
t2 = asyncio.create_task(task(2, 0.1))
t3 = asyncio.create_task(task(3, 0.18))
t4 = asyncio.create_task(task(4, -100))
await asyncio.sleep(0.5)
t1.cancel()
t2.cancel()
t3.cancel()
t4.cancel()
print("finish")
asyncio.run(main())
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