[ruby-core:116108] [Ruby master Bug#20167] Code execution isn't recorded in Ractor

Issue #20167 has been updated by mame (Yusuke Endoh).


At this time, the coverage library should be able to only measure coverage for Ractor that invoked `Coverage.start`. (I have not tried but invoking `Coverage.start` in multiple Ractors may cause fatal problems.)

To improve this situation, probabily we need the following big modification.

* `Covearge.start` registers hooks to all existing Ractors.
* The hook measures coverage data per Ractor, not globally.
* `Coverage.result` aggregates all coverage data from every Ractor.

----------------------------------------
Bug #20167: Code execution isn't recorded in Ractor
https://bugs.ruby-lang.org/issues/20167#change-106102

* Author: shia (Sangyong Sim)
* Status: Open
* Priority: Normal
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
## reproduction code

```ruby
# frozen-string-literal: true

require "coverage"

Coverage.start

require_relative "./some_lib"
# # some_lib.rb
# class C
#   def hoge(i)
#     i
#   end
# end

r = Ractor.new do
  loop do
    v = Ractor.receive
    ret_v = C.new.hoge(v)

    Ractor.yield ret_v
  end
end

2.times do |i|
  r << i
  r.take
end

Coverage.result.each do |file, lines|
  if file.include?("some_ractor_lib")
    if lines == [1, 1, 2, nil, nil]
      puts "OK"
    else
      puts "expected: [1, 1, 2, nil, nil]"
      puts "actual: #{lines.inspect}"
    end
  end
end
```

## Target ruby version

3.2.0+ affected



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