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# -*- Mode: python; coding: utf-8; tab-width: 8; indent-tabs-mode: t; -*-
#
# Copyright (C) 2006 - Ed Catmur <ed@catmur.co.uk>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# The Rhythmbox authors hereby grants permission for non-GPL compatible
# GStreamer plugins to be used and distributed together with GStreamer
# and Rhythmbox. This permission is above and beyond the permissions granted
# by the GPL license by which Rhythmbox is covered. If you modify this code
# you may extend this exception to your version of the code, but you are not
# obligated to do so. If you do not wish to do so, delete this exception
# statement from your version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
class Coroutine:
"""A simple message-passing coroutine implementation.
Not thread- or signal-safe.
Usage:
def my_iter (plexer, args):
some_async_task (..., callback=plexer.send (tokens))
yield None
tokens, (data, ) = plexer.receive ()
...
Coroutine (my_iter, args).begin ()
"""
def __init__ (self, iter, *args):
self._continuation = iter (self, *args)
self._executing = False
def _resume (self):
if not self._executing:
self._executing = True
try:
try:
self._continuation.next ()
while self._data:
self._continuation.next ()
except StopIteration:
pass
finally:
self._executing = False
def clear (self):
self._data = []
def begin (self):
self.clear ()
self._resume ()
def send (self, *tokens):
def callback (*args):
self._data.append ((tokens, args))
self._resume ()
return callback
def receive (self):
return self._data.pop (0)
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