Ruby Ractor.new用法及代碼示例

new(*args, name: nil) {|*args| block } → ractor

使用 args 和一個塊創建一個新的 Ractor 。

塊( Proc )將被隔離(無法訪問外部變量)。塊內的 self 將引用當前的 Ractor 。

r = Ractor.new { puts "Hi, I am #{self.inspect}" }
r.take
# Prints "Hi, I am #<Ractor:#2 test.rb:1 running>"

傳遞給方法的args 將按照與通過 send /Ractor.receive 傳遞的對象相同的規則傳播到塊參數：如果args 不可共享，它們將被複製(通過深度克隆，這可能效率低下)。

arg = [1, 2, 3]
puts "Passing: #{arg} (##{arg.object_id})"
r = Ractor.new(arg) {|received_arg|
  puts "Received: #{received_arg} (##{received_arg.object_id})"
}
r.take
# Prints:
#   Passing: [1, 2, 3] (#280)
#   Received: [1, 2, 3] (#300)

Ractor 的name 可以設置為調試目的：

r = Ractor.new(name: 'my ractor') {}
p r
#=> #<Ractor:#3 my ractor test.rb:1 terminated>