[ZODB-Dev] Threads, ZODB, and how to install ZODB without distutils

[Gary Poster]

On Feb 12, 2007, at 10:01 AM, Manuel Vazquez Acosta wrote:

> Hi Gary,
>
> Although the shared buffer indeed has a queue-like interface  
> there's a catch for my needs. I need that pull method to retrieve  
> the item in the head and to move the head forward, and not to  
> remove the item from the buffer. Just like zc.queue I need a single  
> copy of a item in the queue, but I also need this uniqueness over  
> the time, so that any item which has being consumed already, does  
> not get back to buffer.

Ah, OK.

FWIW, you could get the same functionality with a wrapper around a  
zc.queue pretty easily, of course, with at least a couple of variants  
off the top of my head (both involving an additional data structure  
that you maintain, and supplying your own `put` and `pull` that wrap  
the zc.queue methods, either with composition or inheritance).

If, instead, you move to a multi-threaded model following the same  
approach you outlined before (sequential int keys, IIUC) you'll need  
to be careful of write conflict errors.

Gary