D22339: Make sure solid backends are reentrant

[Aleix Pol Gonzalez]

apol created this revision.
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REVISION SUMMARY
  Solid will create different backends for each separate thread but then some backends will use singletons to share some information.
  This patch includes measures so this sharing only happens within the same thread or adds the necessary locks so threads respect each other.

TEST PLAN
  Tests pass, logic makes sense to me, plasmashell doesn't crash when using D22333 <https://phabricator.kde.org/D22333> (not that it fixes any crashes there)

REPOSITORY
  R245 Solid

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22339

AFFECTED FILES
  src/solid/devices/backends/fstab/fstabhandling.cpp
  src/solid/devices/backends/hal/halfstabhandling.cpp
  src/solid/devices/backends/hal/halstorageaccess.cpp
  src/solid/devices/backends/udisks2/udisksdevicebackend.cpp
  src/solid/devices/backends/udisks2/udisksdevicebackend.h
  src/solid/devices/backends/udisks2/udisksopticaldisc.cpp
  src/solid/devices/backends/udisks2/udisksstorageaccess.cpp

To: apol, #frameworks
Cc: kde-frameworks-devel, LeGast00n, michaelh, ngraham, bruns
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