uniqueid.r2py

""" 
Author: Justin Cappos

Module: A simple library that provides a unique ID for each call

Start date: November 11th, 2008

This is a really, really simple module, only broken out to avoid duplicating 
functionality.

NOTE: This will give unique ids PER FILE.   If you have multiple python 
modules that include this, they will have the potential to generate the
same ID.

"""

# This is a list to prevent using part of the user's mycontext dict
# We use getruntime() instead of a list starting with 0, as this 
# library may get imported multiple times. 
# See ticket #1319 and #1318 for more details.

current_time = getruntime()
uniqueid_idlist = [int((current_time - int(current_time))  * 2**32)]
 
uniqueid_idlock = createlock()

def uniqueid_getid():
  """
   <Purpose>
      Return a unique ID in a threadsafe way

   <Arguments>
      None

   <Exceptions>
      None

   <Side Effects>
      None.

   <Returns>
      The ID (an integer)
  """

  uniqueid_idlock.acquire(True)

  # I'm using a list because I need a global, but don't want to use the 
  # programmer's dict
  myid = uniqueid_idlist[0]
  uniqueid_idlist[0] = uniqueid_idlist[0] + 1

  uniqueid_idlock.release()

  return myid