[ruby-core:86717] [Ruby trunk Feature#14717] [PATCH] thread: allow disabling preempt

Issue #14717 has been reported by normalperson (Eric Wong).

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Feature #14717: [PATCH] thread: allow disabling preempt
https://bugs.ruby-lang.org/issues/14717

* Author: normalperson (Eric Wong)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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In some cases, it may be beneficial to disable preemptibility to
have more predictable behavior than increasing Thread#priority.
Threads with preempt disabled will run until they either:

    a) encounter a thread blocking region
    b) call Thread.pass

This allows native threads to act cooperatively without
being interrupted by other threads.

Thread#preemptible? => true or false
Thread#preemptible = (true|false)


I plan to implement timer-based switching to "auto-fiber/threadlet/thriber/whatever-name"
[Feature #13618] to minimize migration costs from Thread.

However, I think based on the discussion in [Feature #13618]; having
predictability of non-preemptible threads is beneficial.  So implement it
for native Thread for now.

I will unify the behavior of [Feature #13618] with existing Thread.
I think green/native threads can be unified under Thread class similar to
how Fixnum/Bignum are both "Integer".




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