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asyncio

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Hi,

I wrote simple asyncio program (see below) and I'm not sure if I understand
behavior correctly.
I have print_tasks coroutine which prints each task in a loop by using
Task.all_tasks function.
I have also task_launcher coroutine that launches (by loop.create_task())
simple task that waits some and prints "ping".
Question is why finished "ping" tasks keep accumulating in Task.all_tasks?
After a while there is a lot of:
<Task finished coro=<ping() done, defined at test.py:25> result=None>

when printing in Task.all_tasks and number of those increases as new ping
tasks are launched

Is there a way to prune finished tasks (I tried forcing gc) or I do
something wrong?

I ran on python 3.4.3.

Best regards,
L

import asyncio

loop = asyncio.get_event_loop()

@asyncio.coroutine
def print_tasks(loop):
        while True:
                tasks = asyncio.Task.all_tasks(loop)

                for task in tasks:
                        print(task)
                print()

                yield from asyncio.sleep(1)

@asyncio.coroutine
def task_launcher(loop):
        while True:
                yield from asyncio.sleep(1)
                loop.create_task(ping())

@asyncio.coroutine
def ping():
        yield from asyncio.sleep(2)
        print("ping")


loop.create_task(print_tasks(loop))
loop.create_task(task_launcher(loop))

loop.run_forever()

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asyncio Łukasz Ligowski <orangewarrior@gmail.com> - 2015-03-27 01:33 -0700
  Re: asyncio Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 10:55 +0200
    Re: asyncio orangewarrior@gmail.com - 2015-03-27 02:32 -0700
      Re: asyncio Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 14:38 +0200
        Re: asyncio Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-27 08:15 -0600
          Re: asyncio Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 17:44 +0200
            Re: asyncio Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 17:52 +0200
          Re: asyncio orangewarrior@gmail.com - 2015-03-27 16:27 -0700

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