Enumerable missing fiber-related next, rewind, with_index methods
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Key: JRUBY-3435
URL: http://jira.codehaus.org/browse/JRUBY-3435
Project: JRuby
Issue Type: Bug
Components: Ruby 1.9
Reporter: Charles Oliver Nutter
Assignee: Thomas E Enebo
Enumerable#next, rewind, and with_index may require some trickery to implement.
In Ruby 1.9, they use a fiber behind the scenes. If we followed the same
course, we would need to use a native thread for any enumerable executing this
way, which could be prohibitively expensive. However we could also have
special-cased logic for all the core classes, since the details of their
enumeration logic are known to us. So for e.g. array, we could simply store a
position in the Enumerable state or current thread that is array index-aware.
So for many cases we would not need the fiber/thread functionality.
We would need to still detect whether e.g. Array#each has been overridden, so
we know to fall back on the slower mechanism. And when we do need to use
threading, we should certainly be pooling as much as possible to avoid spinning
up a new native thread every time.
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