6027c41c8f
This work was funded through GitHub Sponsors. Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
112 lines
2.9 KiB
Python
112 lines
2.9 KiB
Python
# test asyncio.gather() function
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try:
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import asyncio
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except ImportError:
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print("SKIP")
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raise SystemExit
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async def factorial(name, number):
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f = 1
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for i in range(2, number + 1):
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print("Task {}: Compute factorial({})...".format(name, i))
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await asyncio.sleep(0.01)
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f *= i
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print("Task {}: factorial({}) = {}".format(name, number, f))
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return f
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async def task(id, t=0.1):
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print("start", id)
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await asyncio.sleep(t)
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print("end", id)
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return id
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async def task_loop(id):
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print("task_loop start", id)
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while True:
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await asyncio.sleep(0.1)
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print("task_loop loop", id)
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async def task_raise(id, t=0.1):
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print("task_raise start", id)
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await asyncio.sleep(t)
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print("task_raise raise", id)
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raise ValueError(id)
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async def gather_task(t0, t1):
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print("gather_task")
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await asyncio.gather(t0, t1)
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print("gather_task2")
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async def main():
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# Simple gather with return values
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print(await asyncio.gather(factorial("A", 2), factorial("B", 3), factorial("C", 4)))
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print("====")
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# Gather with no awaitables
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print(await asyncio.gather())
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print("====")
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# Test return_exceptions, where one task is cancelled and the other finishes normally
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tasks = [asyncio.create_task(task(1)), asyncio.create_task(task(2))]
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tasks[0].cancel()
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print(await asyncio.gather(*tasks, return_exceptions=True))
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print("====")
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# Test return_exceptions, where one task raises an exception and the other finishes normally.
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tasks = [asyncio.create_task(task(1)), asyncio.create_task(task_raise(2))]
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print(await asyncio.gather(*tasks, return_exceptions=True))
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print("====")
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# Test case where one task raises an exception and other task keeps running.
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tasks = [asyncio.create_task(task_loop(1)), asyncio.create_task(task_raise(2))]
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try:
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await asyncio.gather(*tasks)
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except ValueError as er:
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print(repr(er))
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print(tasks[0].done(), tasks[1].done())
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for t in tasks:
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t.cancel()
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await asyncio.sleep(0.2)
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print("====")
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# Test case where both tasks raise an exception.
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# Use t=0 so they raise one after the other, between the gather starting and finishing.
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tasks = [asyncio.create_task(task_raise(1, t=0)), asyncio.create_task(task_raise(2, t=0))]
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try:
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await asyncio.gather(*tasks)
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except ValueError as er:
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print(repr(er))
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print(tasks[0].done(), tasks[1].done())
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print("====")
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# Cancel a multi gather.
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t = asyncio.create_task(gather_task(task(1), task(2)))
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await asyncio.sleep(0.05)
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t.cancel()
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await asyncio.sleep(0.2)
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# Test edge cases where the gather is cancelled just as tasks are created and ending.
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for i in range(1, 4):
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print("====")
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t = asyncio.create_task(gather_task(task(1, t=0), task(2, t=0)))
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for _ in range(i):
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await asyncio.sleep(0)
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t.cancel()
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await asyncio.sleep(0.2)
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asyncio.run(main())
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