<p>Fixes <a href="https://github.com/openstreetmap/osm2pgsql/issues/466" class="issue-link" title="Maybe we can use std::thread only?">#466</a> and <a href="https://github.com/openstreetmap/osm2pgsql/issues/464" class="issue-link" title="Multithreading on Windows">#464</a>.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/osm2pgsql/pull/498'>https://github.com/openstreetmap/osm2pgsql/pull/498</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>output-pgsql: use std::async for parallel indexing</li>
  <li>middle-pgsql: use std::async for parallel indexing</li>
  <li>remove all traces of pthread in makefiles</li>
  <li>osmdata: replace boost::thread with std::async</li>
  <li>boost thread dependency no longer needed</li>
  <li>enable multi-threading for all architectures</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-0">CMakeLists.txt</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-1">cmake/config.h.in</a>
    (5)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-2">middle-pgsql.cpp</a>
    (57)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-3">middle-pgsql.hpp</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-4">options.cpp</a>
    (9)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-5">osmdata.cpp</a>
    (78)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/osm2pgsql/pull/498/files#diff-6">output-pgsql.cpp</a>
    (96)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/498.patch'>https://github.com/openstreetmap/osm2pgsql/pull/498.patch</a></li>
  <li><a href='https://github.com/openstreetmap/osm2pgsql/pull/498.diff'>https://github.com/openstreetmap/osm2pgsql/pull/498.diff</a></li>
</ul>

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