Multuprocesscook write file conflicts

hi,i finished merging this patch.There is an check failed, but very easy to workaround.

[Image Removed]After some modification like this:

[Image Removed]it seems worked in mutiprocess cook.

By the way, accoding to your code, it seems each worker would notify server to move the same temp file(such as shared.bnk under MPCookTransfer/) to the target path? so way not exclude those file which is already moved in the server?

Thanks matt~