Feature #21717: Introduce Fiber::Scheduler#process_fork hook

• Status: Open
• Assignee: -
• Target version: -

[noteflakes (Sharon Rosner)]

When using a fiber scheduler and forking a process, the child process "inherits" the fiber scheduler. For the fiber scheduler to be usable in the forked process, its internal state should in most cases be reset.

I propose the introduction of a Fiber::Scheduler#process_fork hook, called by the Ruby runtime immediately after a fork.

The associated PR: https://github.com/ruby/ruby/pull/15342