Ruby Ractor.yield用法及代碼示例

yield(msg, move: false) → nil

向當前 ractor 的傳出端口發送一條消息以供 take 使用。

r = Ractor.new {Ractor.yield 'Hello from ractor'}
puts r.take
# Prints: "Hello from ractor"

該方法是阻塞的，隻有當有人消費了發送的消息時才會返回。

r = Ractor.new do
  Ractor.yield 'Hello from ractor'
  puts "Ractor: after yield"
end
wait
puts "Still not taken"
puts r.take

這將打印：

Still not taken
Hello from ractor
Ractor: after yield

如果傳出端口用 close_outgoing 關閉，該方法將引發：

r = Ractor.new do
  close_outgoing
  Ractor.yield 'Hello from ractor'
end
wait
# `yield': The outgoing-port is already closed (Ractor::ClosedError)

move 參數的含義與 send 相同。