work_dispatcher.hpp
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//
// detail/work_dispatcher.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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_WORK_DISPATCHER_HPP
#define ASIO_DETAIL_WORK_DISPATCHER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/associated_executor.hpp"
#include "asio/associated_allocator.hpp"
#include "asio/executor_work_guard.hpp"
#include "asio/execution/executor.hpp"
#include "asio/execution/allocator.hpp"
#include "asio/execution/blocking.hpp"
#include "asio/execution/outstanding_work.hpp"
#include "asio/prefer.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Handler, typename Executor, typename = void>
struct is_work_dispatcher_required : true_type
{
};
template <typename Handler, typename Executor>
struct is_work_dispatcher_required<Handler, Executor,
typename enable_if<
is_same<
typename associated_executor<Handler,
Executor>::asio_associated_executor_is_unspecialised,
void
>::value
>::type> : false_type
{
};
template <typename Handler, typename Executor, typename = void>
class work_dispatcher
{
public:
template <typename CompletionHandler>
work_dispatcher(ASIO_MOVE_ARG(CompletionHandler) handler,
const Executor& handler_ex)
: handler_(ASIO_MOVE_CAST(CompletionHandler)(handler)),
executor_(asio::prefer(handler_ex,
execution::outstanding_work.tracked))
{
}
#if defined(ASIO_HAS_MOVE)
work_dispatcher(const work_dispatcher& other)
: handler_(other.handler_),
executor_(other.executor_)
{
}
work_dispatcher(work_dispatcher&& other)
: handler_(ASIO_MOVE_CAST(Handler)(other.handler_)),
executor_(ASIO_MOVE_CAST(work_executor_type)(other.executor_))
{
}
#endif // defined(ASIO_HAS_MOVE)
void operator()()
{
execution::execute(
asio::prefer(executor_,
execution::blocking.possibly,
execution::allocator((get_associated_allocator)(handler_))),
ASIO_MOVE_CAST(Handler)(handler_));
}
private:
typedef typename decay<
typename prefer_result<const Executor&,
execution::outstanding_work_t::tracked_t
>::type
>::type work_executor_type;
Handler handler_;
work_executor_type executor_;
};
#if !defined(ASIO_NO_TS_EXECUTORS)
template <typename Handler, typename Executor>
class work_dispatcher<Handler, Executor,
typename enable_if<!execution::is_executor<Executor>::value>::type>
{
public:
template <typename CompletionHandler>
work_dispatcher(ASIO_MOVE_ARG(CompletionHandler) handler,
const Executor& handler_ex)
: work_(handler_ex),
handler_(ASIO_MOVE_CAST(CompletionHandler)(handler))
{
}
#if defined(ASIO_HAS_MOVE)
work_dispatcher(const work_dispatcher& other)
: work_(other.work_),
handler_(other.handler_)
{
}
work_dispatcher(work_dispatcher&& other)
: work_(ASIO_MOVE_CAST(executor_work_guard<Executor>)(other.work_)),
handler_(ASIO_MOVE_CAST(Handler)(other.handler_))
{
}
#endif // defined(ASIO_HAS_MOVE)
void operator()()
{
typename associated_allocator<Handler>::type alloc(
(get_associated_allocator)(handler_));
work_.get_executor().dispatch(
ASIO_MOVE_CAST(Handler)(handler_), alloc);
work_.reset();
}
private:
executor_work_guard<Executor> work_;
Handler handler_;
};
#endif // !defined(ASIO_NO_TS_EXECUTORS)
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_WORK_DISPATCHER_HPP