End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

class method

Ractor.count

count

# File tmp/rubies/ruby-3.1.3/ractor.rb, line 291
def self.count
  __builtin_cexpr! %q{
    ULONG2NUM(GET_VM()->ractor.cnt);
  }
end

Returns total count of Ractors currently running.

Example

Ractor.count                   #=> 1
r = Ractor.new(name: 'example') { Ractor.yield(1) }
Ractor.count                   #=> 2 (main + example ractor)
r.take                         # wait for Ractor.yield(1)
r.take                         # wait till r will finish
Ractor.count                   #=> 1

See also .current .main also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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