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+//
+// timer_queue.hpp
+// ~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 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_TIMER_QUEUE_HPP
+#define BOOST_ASIO_DETAIL_TIMER_QUEUE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <cstddef>
+#include <functional>
+#include <limits>
+#include <memory>
+#include <vector>
+#include <boost/config.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/error.hpp>
+#include <boost/asio/detail/handler_alloc_helpers.hpp>
+#include <boost/asio/detail/hash_map.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/detail/timer_queue_base.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename Time_Traits>
+class timer_queue
+  : public timer_queue_base
+{
+public:
+  // The time type.
+  typedef typename Time_Traits::time_type time_type;
+
+  // The duration type.
+  typedef typename Time_Traits::duration_type duration_type;
+
+  // Constructor.
+  timer_queue()
+    : timers_(),
+      heap_(),
+      cancelled_timers_(0),
+      complete_timers_(0)
+  {
+  }
+
+  // Add a new timer to the queue. Returns true if this is the timer that is
+  // earliest in the queue, in which case the reactor's event demultiplexing
+  // function call may need to be interrupted and restarted.
+  template <typename Handler>
+  bool enqueue_timer(const time_type& time, Handler handler, void* token)
+  {
+    // Ensure that there is space for the timer in the heap. We reserve here so
+    // that the push_back below will not throw due to a reallocation failure.
+    heap_.reserve(heap_.size() + 1);
+
+    // Create a new timer object.
+    std::auto_ptr<timer<Handler> > new_timer(
+        new timer<Handler>(time, handler, token));
+
+    // Insert the new timer into the hash.
+    typedef typename hash_map<void*, timer_base*>::iterator iterator;
+    typedef typename hash_map<void*, timer_base*>::value_type value_type;
+    std::pair<iterator, bool> result =
+      timers_.insert(value_type(token, new_timer.get()));
+    if (!result.second)
+    {
+      result.first->second->prev_ = new_timer.get();
+      new_timer->next_ = result.first->second;
+      result.first->second = new_timer.get();
+    }
+
+    // Put the timer at the correct position in the heap.
+    new_timer->heap_index_ = heap_.size();
+    heap_.push_back(new_timer.get());
+    up_heap(heap_.size() - 1);
+    bool is_first = (heap_[0] == new_timer.get());
+
+    // Ownership of the timer is transferred to the timer queue.
+    new_timer.release();
+
+    return is_first;
+  }
+
+  // Whether there are no timers in the queue.
+  virtual bool empty() const
+  {
+    return heap_.empty();
+  }
+
+  // Get the time for the timer that is earliest in the queue.
+  virtual boost::posix_time::time_duration wait_duration() const
+  {
+    if (heap_.empty())
+      return boost::posix_time::pos_infin;
+    return Time_Traits::to_posix_duration(
+        Time_Traits::subtract(heap_[0]->time_, Time_Traits::now()));
+  }
+
+  // Dispatch the timers that are earlier than the specified time.
+  virtual void dispatch_timers()
+  {
+    const time_type now = Time_Traits::now();
+    while (!heap_.empty() && !Time_Traits::less_than(now, heap_[0]->time_))
+    {
+      timer_base* t = heap_[0];
+      remove_timer(t);
+      t->result_ = boost::system::error_code();
+      t->prev_ = 0;
+      t->next_ = complete_timers_;
+      complete_timers_ = t;
+    }
+  }
+
+  // Cancel the timers with the given token. Any timers pending for the token
+  // will be notified that they have been cancelled next time
+  // dispatch_cancellations is called. Returns the number of timers that were
+  // cancelled.
+  std::size_t cancel_timer(void* timer_token)
+  {
+    std::size_t num_cancelled = 0;
+    typedef typename hash_map<void*, timer_base*>::iterator iterator;
+    iterator it = timers_.find(timer_token);
+    if (it != timers_.end())
+    {
+      timer_base* t = it->second;
+      while (t)
+      {
+        timer_base* next = t->next_;
+        remove_timer(t);
+        t->prev_ = 0;
+        t->next_ = cancelled_timers_;
+        cancelled_timers_ = t;
+        t = next;
+        ++num_cancelled;
+      }
+    }
+    return num_cancelled;
+  }
+
+  // Dispatch any pending cancels for timers.
+  virtual void dispatch_cancellations()
+  {
+    while (cancelled_timers_)
+    {
+      timer_base* this_timer = cancelled_timers_;
+      this_timer->result_ = boost::asio::error::operation_aborted;
+      cancelled_timers_ = this_timer->next_;
+      this_timer->next_ = complete_timers_;
+      complete_timers_ = this_timer;
+    }
+  }
+
+  // Complete any timers that are waiting to be completed.
+  virtual void complete_timers()
+  {
+    while (complete_timers_)
+    {
+      timer_base* this_timer = complete_timers_;
+      complete_timers_ = this_timer->next_;
+      this_timer->next_ = 0;
+      this_timer->complete();
+    }
+  }
+
+  // Destroy all timers.
+  virtual void destroy_timers()
+  {
+    typename hash_map<void*, timer_base*>::iterator i = timers_.begin();
+    typename hash_map<void*, timer_base*>::iterator end = timers_.end();
+    while (i != end)
+    {
+      timer_base* t = i->second;
+      typename hash_map<void*, timer_base*>::iterator old_i = i++;
+      timers_.erase(old_i);
+      destroy_timer_list(t);
+    }
+    heap_.clear();
+    timers_.clear();
+    destroy_timer_list(cancelled_timers_);
+    destroy_timer_list(complete_timers_);
+  }
+
+private:
+  // Base class for timer operations. Function pointers are used instead of
+  // virtual functions to avoid the associated overhead.
+  class timer_base
+  {
+  public:
+    // Delete the timer and post the handler.
+    void complete()
+    {
+      complete_func_(this, result_);
+    }
+
+    // Delete the timer.
+    void destroy()
+    {
+      destroy_func_(this);
+    }
+
+  protected:
+    typedef void (*complete_func_type)(timer_base*,
+        const boost::system::error_code&);
+    typedef void (*destroy_func_type)(timer_base*);
+
+    // Constructor.
+    timer_base(complete_func_type complete_func, destroy_func_type destroy_func,
+        const time_type& time, void* token)
+      : complete_func_(complete_func),
+        destroy_func_(destroy_func),
+        time_(time),
+        token_(token),
+        next_(0),
+        prev_(0),
+        heap_index_(
+            std::numeric_limits<size_t>::max BOOST_PREVENT_MACRO_SUBSTITUTION())
+    {
+    }
+
+    // Prevent deletion through this type.
+    ~timer_base()
+    {
+    }
+
+  private:
+    friend class timer_queue<Time_Traits>;
+
+    // The function to be called to delete the timer and post the handler.
+    complete_func_type complete_func_;
+
+    // The function to be called to delete the timer.
+    destroy_func_type destroy_func_;
+
+    // The result of the timer operation.
+    boost::system::error_code result_;
+
+    // The time when the timer should fire.
+    time_type time_;
+
+    // The token associated with the timer.
+    void* token_;
+
+    // The next timer known to the queue.
+    timer_base* next_;
+
+    // The previous timer known to the queue.
+    timer_base* prev_;
+
+    // The index of the timer in the heap.
+    size_t heap_index_;
+  };
+
+  // Adaptor class template for using handlers in timers.
+  template <typename Handler>
+  class timer
+    : public timer_base
+  {
+  public:
+    // Constructor.
+    timer(const time_type& time, Handler handler, void* token)
+      : timer_base(&timer<Handler>::complete_handler,
+          &timer<Handler>::destroy_handler, time, token),
+        handler_(handler)
+    {
+    }
+
+    // Delete the timer and post the handler.
+    static void complete_handler(timer_base* base,
+        const boost::system::error_code& result)
+    {
+      // Take ownership of the timer object.
+      typedef timer<Handler> this_type;
+      this_type* this_timer(static_cast<this_type*>(base));
+      typedef handler_alloc_traits<Handler, this_type> alloc_traits;
+      handler_ptr<alloc_traits> ptr(this_timer->handler_, this_timer);
+
+      // Make a copy of the error_code and the handler so that the memory can
+      // be deallocated before the upcall is made.
+      boost::system::error_code ec(result);
+      Handler handler(this_timer->handler_);
+
+      // Free the memory associated with the handler.
+      ptr.reset();
+
+      // Make the upcall.
+      handler(ec);
+    }
+
+    // Delete the timer.
+    static void destroy_handler(timer_base* base)
+    {
+      // Take ownership of the timer object.
+      typedef timer<Handler> this_type;
+      this_type* this_timer(static_cast<this_type*>(base));
+      typedef handler_alloc_traits<Handler, this_type> alloc_traits;
+      handler_ptr<alloc_traits> ptr(this_timer->handler_, this_timer);
+
+      // A sub-object of the handler may be the true owner of the memory
+      // associated with the handler. Consequently, a local copy of the handler
+      // is required to ensure that any owning sub-object remains valid until
+      // after we have deallocated the memory here.
+      Handler handler(this_timer->handler_);
+      (void)handler;
+
+      // Free the memory associated with the handler.
+      ptr.reset();
+    }
+
+  private:
+    Handler handler_;
+  };
+
+  // Move the item at the given index up the heap to its correct position.
+  void up_heap(size_t index)
+  {
+    size_t parent = (index - 1) / 2;
+    while (index > 0
+        && Time_Traits::less_than(heap_[index]->time_, heap_[parent]->time_))
+    {
+      swap_heap(index, parent);
+      index = parent;
+      parent = (index - 1) / 2;
+    }
+  }
+
+  // Move the item at the given index down the heap to its correct position.
+  void down_heap(size_t index)
+  {
+    size_t child = index * 2 + 1;
+    while (child < heap_.size())
+    {
+      size_t min_child = (child + 1 == heap_.size()
+          || Time_Traits::less_than(
+            heap_[child]->time_, heap_[child + 1]->time_))
+        ? child : child + 1;
+      if (Time_Traits::less_than(heap_[index]->time_, heap_[min_child]->time_))
+        break;
+      swap_heap(index, min_child);
+      index = min_child;
+      child = index * 2 + 1;
+    }
+  }
+
+  // Swap two entries in the heap.
+  void swap_heap(size_t index1, size_t index2)
+  {
+    timer_base* tmp = heap_[index1];
+    heap_[index1] = heap_[index2];
+    heap_[index2] = tmp;
+    heap_[index1]->heap_index_ = index1;
+    heap_[index2]->heap_index_ = index2;
+  }
+
+  // Remove a timer from the heap and list of timers.
+  void remove_timer(timer_base* t)
+  {
+    // Remove the timer from the heap.
+    size_t index = t->heap_index_;
+    if (!heap_.empty() && index < heap_.size())
+    {
+      if (index == heap_.size() - 1)
+      {
+        heap_.pop_back();
+      }
+      else
+      {
+        swap_heap(index, heap_.size() - 1);
+        heap_.pop_back();
+        size_t parent = (index - 1) / 2;
+        if (index > 0 && Time_Traits::less_than(
+              heap_[index]->time_, heap_[parent]->time_))
+          up_heap(index);
+        else
+          down_heap(index);
+      }
+    }
+
+    // Remove the timer from the hash.
+    typedef typename hash_map<void*, timer_base*>::iterator iterator;
+    iterator it = timers_.find(t->token_);
+    if (it != timers_.end())
+    {
+      if (it->second == t)
+        it->second = t->next_;
+      if (t->prev_)
+        t->prev_->next_ = t->next_;
+      if (t->next_)
+        t->next_->prev_ = t->prev_;
+      if (it->second == 0)
+        timers_.erase(it);
+    }
+  }
+
+  // Destroy all timers in a linked list.
+  void destroy_timer_list(timer_base*& t)
+  {
+    while (t)
+    {
+      timer_base* next = t->next_;
+      t->next_ = 0;
+      t->destroy();
+      t = next;
+    }
+  }
+
+  // A hash of timer token to linked lists of timers.
+  hash_map<void*, timer_base*> timers_;
+
+  // The heap of timers, with the earliest timer at the front.
+  std::vector<timer_base*> heap_;
+
+  // The list of timers to be cancelled.
+  timer_base* cancelled_timers_;
+
+  // The list of timers waiting to be completed.
+  timer_base* complete_timers_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_TIMER_QUEUE_HPP