[Tile-serving] [osm2pgsql] Make more of osm2pgsql threading aware (#110)

[Paul Norman]

With 7c98430cfc45d81af944b6b7a596cc184d7b86b5 I got a segfault on ``osm2pgsql -d gis -c -S ~/osm/osm2pgsql/default.style --drop --cluster geohash --flat-nodes flat.nodes -C 20000 --slim --number-processes 8 planet-130904.osm.pbf``

```
Processing: Node(2013050k 2788.2k/s) Way(0k 0.00k/s) Relation(0 0.00/s)Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Maximum node in persistent node cache: 2445279231
Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Maximum node in persistent node cache: 2445279231
Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Maximum node in persistent node cache: 2445279231
Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Maximum node in persistent node cache: 2445279231
Maximum node in persistent node cache: 2445279231
Using built-in tag processing pipeline
Mid: loading persistent node cache from flat.nodes
Maximum node in persistent node cache: 2445279231
Processing: Node(2013054k 2788.2k/s) Way(133617k 87.96k/s) Relation(0 0.00/s)Segmentation fault (core dumped)

real    39m38.490s
user    110m0.192s
sys     3m53.128s
```

I got a core dump.

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/110#issuecomment-42638558
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