Review Request 128890: Make e.g. Baloo::Query thread safe.

[Christoph Cullmann]

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https://git.reviewboard.kde.org/r/128890/
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Review request for KDE Frameworks, Plasma and Boudhayan Gupta.


Repository: baloo


Description
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lmdb itself is thread safe (e.g. you can use the same env in multiple threads).
Unfortunately, the Baloo::Database itself not, as open() might race against other open calls (we have one unique db object in baloo).

=> add non-recursive mutex (recursive mutex not needed, one just must avoid to call isOpen() or path() inside open, that is done, else no unit test works).


Diffs
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  src/engine/database.h e3bb175 
  src/engine/database.cpp ec7ae2e 

Diff: https://git.reviewboard.kde.org/r/128890/diff/


Testing
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Unit tests still work.


Thanks,

Christoph Cullmann

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