gh-130850 Refactor _close_self_pipe for conditional socket shutdown in asyncio/selector_events.py

[sharktide]

Overview:

Fixes #130850

Conditional Socket Shutdown: The _close_self_pipe function now accepts an optional shutdown parameter. When shutdown=True is passed, the function performs a shutdown of the socket using socket.SHUT_RDWR. If shutdown=False (or if the parameter is omitted), the function proceeds with the original behavior, closing the socket without shutdown.

Error Handling Enhancements: Catches and llogs OSerrors

Testing:

• Test with shutdown=True: Simulates a scenario where a graceful shutdown is performed. The server initiates a shutdown, and the client performs a shutdown before closing the socket.

• Test with shutdown=False (default): Simulates a standard socket closure without shutdown. Both the server and client close the socket without performing a shutdown.

• Issue: asyncio possible Improvement: Using shutdown() Before close() in _close_self_pipe #130850

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[ZeroIntensity]

Per the comments in your other PR, please remove the AI generation from here.

[sharktide]

Per the comments in your other PR, please remove the AI generation from here.

I will

[picnixz]

Considering this is a non-issue, I'm closing the PR.