class method

Ractor.count

() -> ::Integer

count

# File tmp/rubies/ruby-4.0.0/ractor.rb, line 258
def self.count
  __builtin_cexpr! %q{
    ULONG2NUM(GET_VM()->ractor.cnt);
  }
end

Returns the number of ractors currently running or blocking (waiting).

Example

Ractor.count                   #=> 1
r = Ractor.new(name: 'example') { Ractor.receive }
Ractor.count                   #=> 2 (main + example ractor)
r << 42                        # r's Ractor.receive will resume
r.join                         # wait for r's termination
Ractor.count                   #=> 1

See also .[]= .current .[] .main also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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