Queue fix

Separate adding and getting a task. Uses a double-ended queue to buffer incoming tasks. The buffer is then added to the actual queue whenever queue_gettask is called.

Peter, can you check if this doesn't break anything? Thanks!

So far so good. This fix runs both of the current CosmoVolume lockup tests #36 (closed), that is the 40x1 on 4 nodes and 40x12 on 40 nodes tests without any issues. It is currently running 49x12 (maximum nodes I could grab) and on step 2000.

I'll do some less demanding tests next.

Passes all my tests, so I'm happy to accept this. Are you?

if you're happy, i'm happy. make it so!

Good accepting this, will close !168 (closed) and #36 (closed) and create an issue about unnecessary sends.

Status changed to merged

mentioned in commit 17f2903b

mentioned in merge request !168 (closed)

mentioned in issue #36 (closed)