system_context.hpp
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//
// system_context.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_SYSTEM_CONTEXT_HPP
#define ASIO_SYSTEM_CONTEXT_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/scheduler.hpp"
#include "asio/detail/thread_group.hpp"
#include "asio/execution.hpp"
#include "asio/execution_context.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
template <typename Blocking, typename Relationship, typename Allocator>
class basic_system_executor;
/// The executor context for the system executor.
class system_context : public execution_context
{
public:
/// The executor type associated with the context.
typedef basic_system_executor<
execution::blocking_t::possibly_t,
execution::relationship_t::fork_t,
std::allocator<void>
> executor_type;
/// Destructor shuts down all threads in the system thread pool.
ASIO_DECL ~system_context();
/// Obtain an executor for the context.
executor_type get_executor() ASIO_NOEXCEPT;
/// Signal all threads in the system thread pool to stop.
ASIO_DECL void stop();
/// Determine whether the system thread pool has been stopped.
ASIO_DECL bool stopped() const ASIO_NOEXCEPT;
/// Join all threads in the system thread pool.
ASIO_DECL void join();
#if defined(GENERATING_DOCUMENTATION)
private:
#endif // defined(GENERATING_DOCUMENTATION)
// Constructor creates all threads in the system thread pool.
ASIO_DECL system_context();
private:
template <typename, typename, typename> friend class basic_system_executor;
struct thread_function;
// Helper function to create the underlying scheduler.
ASIO_DECL detail::scheduler& add_scheduler(detail::scheduler* s);
// The underlying scheduler.
detail::scheduler& scheduler_;
// The threads in the system thread pool.
detail::thread_group threads_;
// The number of threads in the pool.
std::size_t num_threads_;
};
} // namespace asio
#include "asio/detail/pop_options.hpp"
#include "asio/impl/system_context.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/impl/system_context.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // ASIO_SYSTEM_CONTEXT_HPP