Jim Washington wrote:

I need to produce PDFs with reportlab.

reportlab is not threadsafe. (http://two.pairlist.net/pipermail/reportlab-users/2006-June/005037.html)

I think I need a way to queue or generate a "lockfile" on requests for PDFs so that only one-at-a-time is generated.

I'm hoping that there is a utility for this already, but search in the source for queue or serialize or lock gets me a lot of stuff that does not seem to relate to what I want.

This looks like it would be a relatively simple utility. Has this been done yet? Any hints?

You may want to look at zc.queue: http://svn.zope.org/zc.queue/trunk/src/zc/queue/queue.txt?rev=67933&view=auto

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