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Mark DestructorThread as a daemon #67

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@jxtps jxtps commented Aug 18, 2021

Mark DestructorThread as a daemon so the JVM can exit.

Motivation

Why are you making this change?
To fix #25

Summary

What did you change?
I added sThread.setDaemon(true), which marks the destructor thread as a so called 'daemon' thread so it doesn't stop the JVM from exiting when all (other) user threads have terminated.

How does the code work?
It marks the thread as a daemon (a opposed to user) thread. The JVM keeps running until all user threads exit. This thread never exits.

Why did you choose this approach?
Because this is a textbook daemon thread.

Test Plan

How did you test this change?
See @dreiss code example in #25

Mark DestructorThread as a daemon so the JVM can exit.
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@facebook-github-bot facebook-github-bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Aug 18, 2021
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@passy has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

@mrousavy
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Hey - has this ever been imported & merged internally?

@cortinico
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Hey - has this ever been imported & merged internally?

Nope. It had a bunch of failures internally and was never merged. @passy can tell more here

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JVM doesn't terminate when using Hybrids
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