D7198: lock: refactor in preparation for next commit

[indygreg (Gregory Szorc)]

This revision is now accepted and ready to land.
indygreg added a comment.
indygreg accepted this revision.


  This looks like a non-behavior-changing refactor. Thanks also for the switch to a context manager, which is more robust.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7198/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7198

To: valentin.gatienbaron, #hg-reviewers, indygreg
Cc: indygreg, pulkit, marmoute, mercurial-devel