[Zope] Counter Rentrancy

[David Kyte]

Hi,


If I have a DTML document for generating and tracking say
order numbers, is the code rentrant/Atomic?

<dtml-call "REQUEST.set('counter', counter + 1)">
<dtml-call "manage_changeProperties( counter=REQUEST['counter'] )">
<dtml-return counter >

What I'm really asking is how many threads run in parallel, and
how would multiple threads accessing this code react.

Do I need some form of transation or locking?

Thanks in anticipation

David Kyte