[issue34680] asyncio event_loop fails when accessed from multiple threads

[Andrew Svetlov]

Andrew Svetlov <andrew.svetlov at gmail.com> added the comment:

BaseEventLoop has _check_loop() method that is closed in debug mode only.
UnixEventLoop doesn't call this method for unix-specific API.

Adding the check to add_signal_handler()/remove_signal_handler() doesn't hurt, sure. 
But it doesn't help as the script is executed in non-debug mode.

Performing a check on every call_soon() call kills the performance, that's why debug mode is required.

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<https://bugs.python.org/issue34680>
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