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When using standard executors, work is tracked by requiring (or
preferring) an executor with the execution::outstanding_work.tracked
property. This replaces executor_work_guard and make_work_guard() with
code of the form
asio::io_context io_context;
auto work = asio::require(io_context.get_executor(),
asio::execution::outstanding_work.tracked);
To explicitly reset work, store the returned work-tracking executor in
an any_io_executor object:
asio::any_io_executor work
= asio::require(io_context.get_executor(),
asio::execution::outstanding_work.tracked);
and then assign an empty executor into the object when done:
work = asio::any_io_executor();
57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
//
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// io_context_pool.hpp
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// ~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef HTTP_SERVER2_IO_SERVICE_POOL_HPP
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#define HTTP_SERVER2_IO_SERVICE_POOL_HPP
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#include <boost/asio.hpp>
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#include <list>
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#include <vector>
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#include <boost/noncopyable.hpp>
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#include <boost/shared_ptr.hpp>
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namespace http {
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namespace server2 {
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/// A pool of io_context objects.
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class io_context_pool
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: private boost::noncopyable
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{
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public:
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/// Construct the io_context pool.
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explicit io_context_pool(std::size_t pool_size);
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/// Run all io_context objects in the pool.
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void run();
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/// Stop all io_context objects in the pool.
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void stop();
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/// Get an io_context to use.
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boost::asio::io_context& get_io_context();
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private:
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typedef boost::shared_ptr<boost::asio::io_context> io_context_ptr;
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/// The pool of io_contexts.
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std::vector<io_context_ptr> io_contexts_;
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/// The work-tracking executors that keep the io_contexts running.
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std::list<boost::asio::any_io_executor> work_;
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/// The next io_context to use for a connection.
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std::size_t next_io_context_;
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};
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} // namespace server2
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} // namespace http
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#endif // HTTP_SERVER2_IO_SERVICE_POOL_HPP
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