Cannot instanciate Http::Parser in Ractor

[tagomoris]

The exception below happened:

Unexpected error: ractor unsafe method called from not main ractor
	/Users/tagomoris/gh/right_speed/lib/right_speed/handler.rb:91:in `initialize'
	/Users/tagomoris/gh/right_speed/lib/right_speed/handler.rb:91:in `new'
	/Users/tagomoris/gh/right_speed/lib/right_speed/handler.rb:91:in `initialize'
 	/Users/tagomoris/gh/right_speed/lib/right_speed/handler.rb:12:in `new'
 	/Users/tagomoris/gh/right_speed/lib/right_speed/handler.rb:12:in `session'
 	/Users/tagomoris/gh/right_speed/lib/right_speed/worker/reader.rb:14:in `block in run'

Code called in a Ractor

        @parser = Http::Parser.new(self)

Is that because Http::Parser is a native-code library?

[tagomoris]

What is the "Ractor-safe" method? No documents https://docs.ruby-lang.org/en/master/Ractor.html

[tagomoris]

In the Ruby code, call_cfunc_* functions always call ractor_unsafe_check(); at first, and it raises the exception if it's not in the main ractor.

[tagomoris]

We can use TracePoint's :c_call event to find such method calls.