D20940: [baloo_file] Wait for extractor process to start

[Stefan Brüns]

bruns accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R293 Baloo

BRANCH
  waitForStart

REVISION DETAIL
  https://phabricator.kde.org/D20940

To: nicolasfella, #baloo, bruns
Cc: bruns, apol, kde-frameworks-devel, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, abrahams
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