//
// detail/impl/win_iocp_io_service.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2011 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 ASIO_DETAIL_IMPL_WIN_IOCP_IO_SERVICE_HPP
#define ASIO_DETAIL_IMPL_WIN_IOCP_IO_SERVICE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"

#if defined(ASIO_HAS_IOCP)

#include "asio/detail/call_stack.hpp"
#include "asio/detail/completion_handler.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
namespace detail {

template <typename Handler>
void win_iocp_io_service::dispatch(Handler handler)
{
  if (call_stack<win_iocp_io_service>::contains(this))
  {
    asio::detail::fenced_block b;
    asio_handler_invoke_helpers::invoke(handler, handler);
  }
  else
    post(handler);
}

template <typename Handler>
void win_iocp_io_service::post(Handler handler)
{
  // Allocate and construct an operation to wrap the handler.
  typedef completion_handler<Handler> op;
  typename op::ptr p = { boost::addressof(handler),
    asio_handler_alloc_helpers::allocate(
      sizeof(op), handler), 0 };
  p.p = new (p.v) op(handler);

  post_immediate_completion(p.p);
  p.v = p.p = 0;
}

template <typename Time_Traits>
void win_iocp_io_service::add_timer_queue(
    timer_queue<Time_Traits>& queue)
{
  do_add_timer_queue(queue);
}

template <typename Time_Traits>
void win_iocp_io_service::remove_timer_queue(
    timer_queue<Time_Traits>& queue)
{
  do_remove_timer_queue(queue);
}

template <typename Time_Traits>
void win_iocp_io_service::schedule_timer(timer_queue<Time_Traits>& queue,
    const typename Time_Traits::time_type& time,
    typename timer_queue<Time_Traits>::per_timer_data& timer, timer_op* op)
{
  // If the service has been shut down we silently discard the timer.
  if (::InterlockedExchangeAdd(&shutdown_, 0) != 0)
  {
    post_immediate_completion(op);
    return;
  }

  mutex::scoped_lock lock(dispatch_mutex_);

  bool earliest = queue.enqueue_timer(time, timer, op);
  work_started();
  if (earliest)
    update_timeout();
}

template <typename Time_Traits>
std::size_t win_iocp_io_service::cancel_timer(timer_queue<Time_Traits>& queue,
    typename timer_queue<Time_Traits>::per_timer_data& timer)
{
  // If the service has been shut down we silently ignore the cancellation.
  if (::InterlockedExchangeAdd(&shutdown_, 0) != 0)
    return 0;

  mutex::scoped_lock lock(dispatch_mutex_);
  op_queue<win_iocp_operation> ops;
  std::size_t n = queue.cancel_timer(timer, ops);
  post_deferred_completions(ops);
  return n;
}

} // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // defined(ASIO_HAS_IOCP)

#endif // ASIO_DETAIL_IMPL_WIN_IOCP_IO_SERVICE_HPP
