class Ractor::Port

Returns a new Ractor::Port object.

Closes the port. Sending to a closed port is prohibited. Receiving is also prohibited if there are no messages in its message queue.

Only the Ractor which created the port is allowed to close it.

port = Ractor::Port.new
Ractor.new port do |port|
  port.close #=> closing port by other ractors is not allowed (Ractor::Error)
end.join

Returns whether or not the port is closed.

Receives a message from the port (which was sent there by Port#send). Only the ractor that created the port can receive messages this way.

port = Ractor::Port.new
r = Ractor.new port do |port|
  port.send('message1')
end

v1 = port.receive
puts "Received: #{v1}"
r.join
# This will print: "Received: message1"

The method blocks the current Thread if the message queue is empty.

port = Ractor::Port.new
r = Ractor.new port do |port|
  wait
  puts "Still not received"
  port.send('message1')
  wait
  puts "Still received only one"
  port.send('message2')
end
puts "Before first receive"
v1 = port.receive
puts "Received: #{v1}"
v2 = port.receive
puts "Received: #{v2}"
r.join

Output:

Before first receive
Still not received
Received: message1
Still received only one
Received: message2

If the port is closed and there are no more messages in the message queue, the method raises Ractor::ClosedError.

port = Ractor::Port.new
port.close
port.receive #=> raise Ractor::ClosedError

Sends a message to the port to be accepted by port.receive.

port = Ractor::Port.new
r = Ractor.new(port) do |port|
  port.send 'message'
end
value = port.receive
puts "Received #{value}"
# Prints: "Received: message"

The method is non-blocking (it will return immediately even if the ractor that created the port is not ready to receive anything):

port = Ractor::Port.new
r = Ractor.new(port) do |port|
  port.send 'test'
  puts "Sent successfully"
  # Prints: "Sent successfully" immediately
end

An attempt to send to a closed port will raise Ractor::ClosedError.

r = Ractor.new {Ractor::Port.new}
r.join
p r
# "#<Ractor:#6 (irb):23 terminated>"
port = r.value
port.send('test') # raise Ractor::ClosedError

If the obj is unshareable, by default it will be copied into the receiving ractor by deep cloning.

If the object is shareable, a reference to the object will be sent to the receiving ractor.