From: v.starcev@...
Date: 2021-03-05T09:23:24+00:00
Subject: [ruby-core:102739] [Ruby master Misc#11904] Why was Thread.exclusive deprecated?
Issue #11904 has been updated by Jameshaivy (Jameshaivy Jameshaivy).
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Misc #11904: Why was Thread.exclusive deprecated?
https://bugs.ruby-lang.org/issues/11904#change-90747
* Author: bascule (Tony Arcieri)
* Status: Rejected
* Priority: Normal
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initialize a mutex because the mutex must be initialized in a thread-safe context where it's not possible for multiple caller threads to initialize the mutex concurrently.
One use case is here: this is an idempotent native function invoked via FFI. The contract is that it can be called repeatedly, but only by one thread at a time (concurrent calls from multiple threads can potentially corrupt its internal state):
https://github.com/cryptosphere/rbnacl/blob/master/lib/rbnacl.rb#L88
Thread.exclusive is useful because it provides an implicit mutex you can ensure is initialized correctly before any other threads start.
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