[Tile-serving] [openstreetmap/osm2pgsql] limit the number of buffers that are in the copy queue (#960)

[Sarah Hoffmann]

@lonvia pushed 2 commits.

a6841494be91c12119750344e964fae0274cc1bc  limit the number of buffers that are in the copy queue
c57466ab52417e3c706a2dc74f2802b4cc08a4b9  use predicate of conditional::wait instead of hand-crafted loop


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/960/files/f81cbbbbb6a00a79295632977a394629bde0f176..c57466ab52417e3c706a2dc74f2802b4cc08a4b9
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