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

[Paul Norman]

GDB backtrace

```
Core was generated by `osm2pgsql/osm2pgsql -d gis -c -S /home/pnorman/osm/osm2pgsql/default.style --dr'.
Program terminated with signal 11, Segmentation fault.
#0  _int_free (av=0x7f76e11e1720, p=0xa4a69e0, have_lock=0) at malloc.c:4037
4037    malloc.c: No such file or directory.
(gdb) bt
#0  _int_free (av=0x7f76e11e1720, p=0xa4a69e0, have_lock=0) at malloc.c:4037
#1  0x0000000000414e3b in freeItem (p=0xa48ea00) at keyvals.c:45
#2  0x00000000004153a5 in resetList (head=0xa4ab360) at keyvals.c:274
#3  0x000000000040cc19 in pgsql_add_way_single (way=0xa4cab20, ctx=0x7f7192fd2e50) at output-pgsql.c:772
#4  pgsql_worker_thread (pointer=0xa49a640) at output-pgsql.c:1028
#5  0x00007f76e11efe9a in start_thread (arg=0x7f7192fd3700) at pthread_create.c:308
#6  0x00007f76e0f1c3fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()
(gdb)
```

I thought we had encountered this before and fixed it?



---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/110#issuecomment-42639069
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