#!/usr/local/bin/python

from threading import Lock

class list_log:
    """
    Provide an interface that lets logger.StreamHandler s write to a list
    of strings.
    """
    def __init__(self, l=[]):
	"""
	Link to an existing list or just create a log
	"""
	self.ll = l
	self.lock = Lock()
    def write(self, str):
	"""
	Add the string to the log.  Lock for consistency.
	"""
	self.lock.acquire()
	self.ll.append(str)
	self.lock.release()

    def flush(self):
	"""
	No-op that StreamHandlers expect
	"""
	pass