[issue22922] asyncio: call_soon() should raise an exception if the event loop is closed
STINNER Victor
report at bugs.python.org
Fri Nov 28 13:48:44 CET 2014
STINNER Victor added the comment:
call_soon_after_close.diff looks good but also incomplete: call_later, call_at and run_in_executor should also raise an exception if the event loop is closed.
You should also add call_soon_threadsafe to the test.
> So for consistency this patch should grow quite a bit (unless create_connection, add_reader etc. already raise in this case).
Yes, add_reader raises an exception and there is an unit test to ensure that.
create_task() is a little bit special, it does not schedule immediatly a coroutine. IMO it makes sense to fail if the loop was closed, I don't see how the task can be executed if the loop was executed, so calling create_task() on a closed loop looks like a bug.
I suggest to modify the following methods:
- call_soon, call_soon_threadsafe
- call_at, call_later
- run_in_executor
- create_task
- add_signal_handler
- subprocess_exec, subprocess_shell
Did I miss something?
I'm not sure that *all* asyncio methods should must call _check_closed(), it may make the code harder to read. If the basic functions like call_soon and add_reader already handle the closed status, I guess that all other methods will fail loudly, so they don't need to be modified.
For example, stop() calls call_soon() and so will also raises an exception if the loop is closed.
Maybe we should add almost all methods to the test checking that calling these methods on a closed loop fail.
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<http://bugs.python.org/issue22922>
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