Nyall Dawson 8f902e7796 Implement manual locks on QgsSpatialIndex
Since libspatialindex is not thread safe on all platforms, and
have expressed desire to remove the thread safety that they DO
have on remaining platforms, it's safer and easier for us
to manually add locks to QgsSpatialIndex and be gauranteed that
this class is thread safe on all platforms and libspatialindex
versions.

Also improve docs for the class.
2018-02-09 20:13:04 +11:00
..
2018-02-09 09:38:04 +01:00