[Tile-serving] [osm2pgsql] Crash when updating with more than one thread (#229)

[Sarah Hoffmann]

I don't think writing to the node_persistent_cache is thread-safe. @apmon used a big write lock in his threading branch: https://github.com/openstreetmap/osm2pgsql/pull/110/files#diff-c183a1ac173f18d368af24d1657db793L37

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/229#issuecomment-66183991
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