[ruby-core:74280] [Ruby trunk Feature#3944] Add Fiber#root? method

Issue #3944 has been updated by Victor Maslov.


For example, the Facebook Graph API server accepts POST request to calculate smth heavy and returns id of the 'async job'. Then I GET status until it's "complete" and then I GET the actual result.  
To process thousands of requests I call my method_that_gets_data from inside Fiber.new for each URL and cycle through them until they are done. Inside method_that_gets_data there are yeilds when doing the first POST and when status is not "complete", so I know when the fiber is done or I should just check another one.  
Now I want to reuse the method_that_gets_data without fibers -- to know whether to yield or to work until done I need to know if I'm running inside Fiber or not.

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Feature #3944: Add Fiber#root? method
https://bugs.ruby-lang.org/issues/3944#change-57403

* Author: Mike Perham
* Status: Feedback
* Priority: Normal
* Assignee: Koichi Sasada
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=begin
 Since the root fiber is treated differently than other Fibers (e.g. you can't yield from the root), code which can optionally use fibers for high-performance IO (in my case, the Mysql2 driver) needs Fiber#root? to know when it can use Fibers to execute a query versus using a standard blocking call.
=end




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