// Copyright (c) 2006, 2007 Julio M. Merino Vidal
	// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
	// Copyright (c) 2009 Boris Schaeling
	// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
	// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
	// Copyright (c) 2016 Klemens D. Morgenstern
	//
	// 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)
	
	/**
	 * \file boost/process/child.hpp
	 *
	 * Defines a child process class.
	 */
	
	#ifndef BOOST_PROCESS_CHILD_DECL_HPP
	#define BOOST_PROCESS_CHILD_DECL_HPP
	
	#include <boost/process/detail/config.hpp>
	#include <chrono>
	#include <memory>
	
	#include <boost/none.hpp>
	#include <atomic>
	
	#if defined(BOOST_POSIX_API)
	#include <boost/process/detail/posix/child_handle.hpp>
	#include <boost/process/detail/posix/terminate.hpp>
	#include <boost/process/detail/posix/wait_for_exit.hpp>
	#include <boost/process/detail/posix/is_running.hpp>
	#elif defined(BOOST_WINDOWS_API)
	#include <boost/process/detail/windows/child_handle.hpp>
	#include <boost/process/detail/windows/terminate.hpp>
	#include <boost/process/detail/windows/wait_for_exit.hpp>
	#include <boost/process/detail/windows/is_running.hpp>
	
	#endif
	namespace boost {
	
	namespace process {
	
	using ::boost::process::detail::api::pid_t;
	
	class child
	{
	    ::boost::process::detail::api::child_handle _child_handle;
	    std::shared_ptr<std::atomic<int>> _exit_status = std::make_shared<std::atomic<int>>(::boost::process::detail::api::still_active);
	    bool _attached = true;
	    bool _terminated = false;
	
	    bool _exited()
	    {
	        return _terminated || !::boost::process::detail::api::is_running(_exit_status->load());
	    };
	public:
	    typedef ::boost::process::detail::api::child_handle child_handle;
	    typedef child_handle::process_handle_t native_handle_t;
	    explicit child(child_handle &&ch, std::shared_ptr<std::atomic<int>> &ptr) : _child_handle(std::move(ch)), _exit_status(ptr) {}
	    explicit child(child_handle &&ch, const std::shared_ptr<std::atomic<int>> &ptr) : _child_handle(std::move(ch)), _exit_status(ptr) {}
	    explicit child(child_handle &&ch) : _child_handle(std::move(ch)) {}
	
	    explicit child(pid_t & pid) : _child_handle(pid), _attached(false) {};
	    child(const child&) = delete;
	    child(child && lhs) noexcept
	        : _child_handle(std::move(lhs._child_handle)),
	          _exit_status(std::move(lhs._exit_status)),
	          _attached (lhs._attached),
	          _terminated (lhs._terminated)
	    {
	        lhs._attached = false;
	    }
	
	    template<typename ...Args>
	    explicit child(Args&&...args);
	    child() {}
	    child& operator=(const child&) = delete;
	    child& operator=(child && lhs)
	    {
	        _child_handle= std::move(lhs._child_handle);
	        _exit_status = std::move(lhs._exit_status);
	        _attached    = lhs._attached;
	        _terminated  = lhs._terminated;
	        lhs._attached = false;
	        return *this;
	    };
	
	    void detach() {_attached = false; }
	    void join() {wait();}
	    bool joinable() { return _attached;}
	
	    ~child()
	    {
	        std::error_code ec;
	        if (_attached && !_exited() && running(ec))
	            terminate(ec);
	    }
	    native_handle_t native_handle() const { return _child_handle.process_handle(); }
	
	
	    int exit_code() const {return ::boost::process::detail::api::eval_exit_status(_exit_status->load());}
	    pid_t id()      const {return _child_handle.id(); }
	
	    bool running()
	    {
	        std::error_code ec;
	        bool b = running(ec);

	        boost::process::detail::throw_error(ec, "running error");
	        return b;
	    }
	
	    void terminate()
	    {
	        std::error_code ec;
	        terminate(ec);
	        boost::process::detail::throw_error(ec, "terminate error");
	    }
	
	    void wait()
	    {
	        std::error_code ec;
	        wait(ec);
	        boost::process::detail::throw_error(ec, "wait error");
	    }
	
	    template< class Rep, class Period >
	    bool wait_for (const std::chrono::duration<Rep, Period>& rel_time)
	    {
	        std::error_code ec;
	        bool b = wait_for(rel_time, ec);
	        boost::process::detail::throw_error(ec, "wait_for error");
	        return b;
	    }
	
	    template< class Clock, class Duration >
	    bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time )
	    {
	        std::error_code ec;
	        bool b = wait_until(timeout_time, ec);
	        boost::process::detail::throw_error(ec, "wait_until error");
	        return b;
	    }
	
	    bool running(std::error_code & ec) noexcept
	    {
	        if (valid() && !_exited())
	        {
	            int exit_code = 0;
	            auto res = boost::process::detail::api::is_running(_child_handle, exit_code, ec);
	            if (!res && !_exited())
	                _exit_status->store(exit_code);
	
	            return res;
	        }
	        return false;
	    }
	
	    void terminate(std::error_code & ec) noexcept
	    {
	        if (valid() && running(ec))
	            boost::process::detail::api::terminate(_child_handle, ec);
	
	        _terminated = true;
	    }
	
	    void wait(std::error_code & ec) noexcept
	    {
	        if (!_exited() && valid())
	        {
	            int exit_code = 0;
	            boost::process::detail::api::wait(_child_handle, exit_code, ec);
	            _exit_status->store(exit_code);
	        }
	    }
	
	    template< class Rep, class Period >
	    bool wait_for (const std::chrono::duration<Rep, Period>& rel_time, std::error_code & ec) noexcept
	    {
	        return wait_until(std::chrono::steady_clock::now() + rel_time, ec);
	    }
	
	    template< class Clock, class Duration >
	    bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time, std::error_code & ec) noexcept
	    {
	        if (!_exited())
	        {
	            int exit_code = 0;
	            auto b = boost::process::detail::api::wait_until(_child_handle, exit_code, timeout_time, ec);
	            if (!b)
	                return false;
	            _exit_status->store(exit_code);
	        }
	        return true;
	    }
	
	
	    bool valid() const
	    {
	        return _child_handle.valid();
	    }
	    operator bool() const {return valid();}
	
	    bool in_group() const
	    {
	        return _child_handle.in_group();
	    }
	    bool in_group(std::error_code &ec) const noexcept
	    {
	        return _child_handle.in_group(ec);
	    }
	};
	
	
	
	}}
	#endif