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diff --git a/boost/asio/detail/impl/timer_queue_set.ipp b/boost/asio/detail/impl/timer_queue_set.ipp
new file mode 100644
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+++ b/boost/asio/detail/impl/timer_queue_set.ipp
@@ -0,0 +1,103 @@
+//
+// detail/impl/timer_queue_set.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_IMPL_TIMER_QUEUE_SET_IPP
+#define BOOST_ASIO_DETAIL_IMPL_TIMER_QUEUE_SET_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+#include <boost/asio/detail/timer_queue_set.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+timer_queue_set::timer_queue_set()
+  : first_(0)
+{
+}
+
+void timer_queue_set::insert(timer_queue_base* q)
+{
+  q->next_ = first_;
+  first_ = q;
+}
+
+void timer_queue_set::erase(timer_queue_base* q)
+{
+  if (first_)
+  {
+    if (q == first_)
+    {
+      first_ = q->next_;
+      q->next_ = 0;
+      return;
+    }
+
+    for (timer_queue_base* p = first_; p->next_; p = p->next_)
+    {
+      if (p->next_ == q)
+      {
+        p->next_ = q->next_;
+        q->next_ = 0;
+        return;
+      }
+    }
+  }
+}
+
+bool timer_queue_set::all_empty() const
+{
+  for (timer_queue_base* p = first_; p; p = p->next_)
+    if (!p->empty())
+      return false;
+  return true;
+}
+
+long timer_queue_set::wait_duration_msec(long max_duration) const
+{
+  long min_duration = max_duration;
+  for (timer_queue_base* p = first_; p; p = p->next_)
+    min_duration = p->wait_duration_msec(min_duration);
+  return min_duration;
+}
+
+long timer_queue_set::wait_duration_usec(long max_duration) const
+{
+  long min_duration = max_duration;
+  for (timer_queue_base* p = first_; p; p = p->next_)
+    min_duration = p->wait_duration_usec(min_duration);
+  return min_duration;
+}
+
+void timer_queue_set::get_ready_timers(op_queue<operation>& ops)
+{
+  for (timer_queue_base* p = first_; p; p = p->next_)
+    p->get_ready_timers(ops);
+}
+
+void timer_queue_set::get_all_timers(op_queue<operation>& ops)
+{
+  for (timer_queue_base* p = first_; p; p = p->next_)
+    p->get_all_timers(ops);
+}
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_IMPL_TIMER_QUEUE_SET_IPP