no idea what this is? Henning
This is related to your comment on the 5,7 stable branch: this PR restricts thread wrapping to process_no=0, i.e., from workers POV - no change in behaviour so the same as 5.7.4, 5.7.3 ...
For process_no=0 it will run libssl calls in a thread to prevent thread locals from being created pre-fork.