@SailorMax patch updated, can you try the new one please?

With new patch all my processes has exitCode = 1 and did not work at all. Can't write stdout and stderr to locked files?

Thanks, can you try again please? It should be good now (at least appveyor is green.)

Yes, latest patch work as expected in my case.
Thank you!

But after work temp files remain in the temp-directory. Is it feature? :)

It is :) Actually there is no way around: unlinking the file would create race conditions.
The compromise here is to use incremental numbers for files so that there should be only a limited number of them to keep in the tmp dir.
We used to use random files to remove any locks, but the outcome was worse: there is no way to delete these tmp files 100% of the time, leading to the tmp dir being filled with empty files on real-world apps. A much worse outcome.

For me - not a problem :)

Thank you @nicolas-grekas.