Allow multiprocessshared to spawn process and delete directly with obj

[AMOOOMA]

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI or the workflows README to see a list of phrases to trigger workflows.

[AMOOOMA]

R: @damccorm

[gemini-code-assist]

Summary of Changes

Hello @AMOOOMA, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the MultiProcessShared utility by introducing the capability to host shared objects within dedicated, spawned processes. This change provides more explicit control over the lifecycle of shared resources, allowing for direct termination and cleanup of the serving process, and includes mechanisms to prevent zombie processes and handle server startup failures gracefully.

Highlights

• Process Spawning for Shared Objects: The MultiProcessShared utility now supports hosting shared objects within dedicated, spawned processes, controlled by a new spawn_process boolean parameter in its constructor.
• Direct Object Deletion: A new unsafe_hard_delete method has been introduced, allowing for the explicit termination and cleanup of the shared object and its serving process, providing more granular control over resource lifecycle.
• Robust Process Management: The newly spawned server processes include a 'Suicide Pact' monitor, ensuring they automatically terminate if their parent process dies. The server startup also incorporates robust error handling and logging.
• Zombie Process Reaping: The acquire method now includes logic to sweep and reap any finished (zombie) child processes, improving overall resource management and preventing accumulation of defunct processes.
• Serialization Support for Proxies: The _AutoProxyWrapper class now includes __setstate__ and __getstate__ methods, enhancing the serialization capabilities of proxy objects.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control. If you'd like to restart, comment assign set of reviewers