Support to green threads

[hmspider]

in https://bugs.ruby-lang.org/issues/14739 you say:

The coroutine implementation was specifically designed to handle cross-thread migrations, in the sense that all the required state to yield/resume is passed as arguments/returns to/from the coroutine.

I wonder if you intend to provide support for couroutine auto-scheduling, in the lines of:

• coroutine blocks itself (userspace) -> schedule another sleeping couroutine in the same OS thread
• couroutine blocks underlying thread (syscalls etc) -> schedule another sleeping couroutine in other OS thread

[ioquatix]

You mean in this C++ implementation?

[hmspider]

Assuming this is the one that was used for ruby Fiber implementation, yes.

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