Feature #16827: C API for writing custom random number generator that can be used as Random objects

• Status: Closed
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -

[mrkn (Kenta Murata)]

I want to write custom random number generators (RNGs) that can be used as an alternative to a Random object.
Now custom RNGs with #rand method can be used for that purpose, but there is the method call overhead in the current implementation because #rand method is called through rb_funcallv_public.
I want C API for writing RNGs because all of the random number generator algorithms I want to write are originally written in C.

Nobu already created a pull-request for such purpose.

[matz (Yukihiro Matsumoto)]

Sounds OK. Go ahead.

Matz.

[Eregon (Benoit Daloze)]

IMHO it's not nice to replace a nice Ruby-level API by a C API one.
Is there a benchmark of how much is it slower with rb_funcallv_public?

Also, will it still work when passing a custom object understanding rand?
If so, there are two ways to dispatch, doesn't seem nice either API-wise.

[mrkn (Kenta Murata)]

• Status changed from Open to Closed

Closed by af5e87ab218c5f4e34c6cdb54ae119a7f0f9033f

[mame (Yusuke Endoh)]

• Related to Feature #18463: Random number generation with xoshiro added