Issue #14739 has been updated by ioquatix (Samuel Williams).


Here is the test which shows coroutine arguments and `coroutine_transfer` result.

https://github.com/kurocha/coroutine/blob/9bbd5e514c2e0f8f3c7c1c277aa6deb5e337a9c7/test/Coroutine/transfer.cpp#L17-L21

The reason for `COROUTINE` macro is that on win32, in order to avoid lots of stack manipulation, we need to use `__fastcall`.

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Feature #14739: Improve fiber yield/resume performance
https://bugs.ruby-lang.org/issues/14739#change-71988

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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I am interested to improve Fiber yield/resume performance.

I've used this library before: http://software.schmorp.de/pkg/libcoro.html and handled millions of HTTP requests using it.

I'd suggest to use that library.

As this is used in many places in Ruby (e.g. enumerable) it could be a big performance win across the board.

Here is a nice summary of what was done for RethinkDB: https://rethinkdb.com/blog/making-coroutines-fast/

Does Ruby currently reuse stacks? This is also a big performance win if it's not being done already.



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