ruby-on-rails - TCP 套接字 IO 卡住

Question

我想实现一个 TCP 客户端并使用一个线程来读取另一个要写的线程。但是对于读取线程，我遇到了一个问题:“stuck while io gets bytes”

class SocketClientManager

  def initialize
   @socket = TCPSocket.new '192.168.3.86', 15533
   @response = nil
   @send = nil
   read
  end

  def read
    @response = Thread.new do
      loop {
        p "listen response from TCP server"
        # will stuck here while trying to "get bytes" from io in the code below
        header = @socket.gets(4).unpack('N')[0] 
        case header
        when case1 
        when case2 
        end 
      }
    end
  end

谁能帮忙解决这个问题？

Answer 1

使用recmsg_nonblock方法可以解决问题。

readfds, writefds, exceptfds = select([@socket], nil, nil, 1)
p :r => readfds, :w => writefds, :e => exceptfds
if readfds
  p "we are in read status"
  #will not be blocked if not gets bytes from buffer
  hhh = @socket.recvmsg_nonblock(10000)  
else
  p "we are not in read status"
end