Background thread

Jp Calderone exarkun at divmod.com
Sat Jun 25 12:50:07 CEST 2005


On Sat, 25 Jun 2005 11:36:57 +0100, Jorge Louis De Castro <jorge at bcs.org.uk> wrote:
>Hi,
>
>I'm new to python and I'm having trouble figuring out a way to have a thread running on the background that over rules the raw_input function. The example I'm working on is something like having a thread that prints "You're taking too long" every 10 seconds, while waiting for input from the user.
>The problem is that I can only read (and in batch) the thread printout messages on the console after giving something to raw_input.
>Is it not possible to have the thread print its stuff and then return to raw_input() ? Any code examples or pseudo-code or documentation directions will be highly appreciated.
>
>Thanks in advance
>

Here's one way you might do it without threads or raw_input()

  from twisted.protocols import basic, policies

  class AnnoyProtocol(basic.LineReceiver, policies.TimeoutMixin):
      from os import linesep as delimiter

      def connectionMade(self):
          self.setTimeout(10)

      def timeoutConnection(self):
          self.resetTimeout()
          self.sendLine("You're taking too long!")

      def lineReceived(self, line):
          self.resetTimeout()
          self.sendLine("Thank you for the line of input!")

  from twisted.internet import reactor, stdio
  stdio.StandardIO(AnnoyProtocol())
  reactor.run()

For fancy line editing support, twisted.conch.recvline might be of interest.

Hope this helps,

Jp



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