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// 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/group.hpp
*
* Defines a group process class.
* For additional information see the platform specific implementations:
*
* - [windows - job object](https://msdn.microsoft.com/en-us/library/windows/desktop/ms684161.aspx)
* - [posix - process group](http://pubs.opengroup.org/onlinepubs/009695399/functions/setpgid.html)
*
*/
#ifndef BOOST_PROCESS_GROUP_HPP
#define BOOST_PROCESS_GROUP_HPP
#include <boost/process/detail/config.hpp>
#include <boost/process/child.hpp>
#include <chrono>
#include <memory>
#include <boost/none.hpp>
#include <atomic>
#if defined(BOOST_POSIX_API)
#include <boost/process/detail/posix/group_handle.hpp>
#include <boost/process/detail/posix/group_ref.hpp>
#include <boost/process/detail/posix/wait_group.hpp>
#elif defined(BOOST_WINDOWS_API)
#include <boost/process/detail/windows/group_handle.hpp>
#include <boost/process/detail/windows/group_ref.hpp>
#include <boost/process/detail/windows/wait_group.hpp>
#endif
namespace boost {
namespace process {
namespace detail {
struct group_builder;
}
/**
* Represents a process group.
*
* Groups are movable but non-copyable. The destructor
* automatically closes handles to the group process.
*
* The group will have the same interface as std::thread.
*
* \note If the destructor is called without a previous detach or wait, the group will be terminated.
*
* \attention If a default-constructed group is used before being used in a process launch, the behaviour is undefined.
*
* \attention Waiting for groups is currently broken on windows and will most likely result in a dead-lock.
*/
class group
{
::boost::process::detail::api::group_handle _group_handle;
bool _attached = true;
public:
typedef ::boost::process::detail::api::group_handle group_handle;
///Native representation of the handle.
typedef group_handle::handle_t native_handle_t;
explicit group(group_handle &&ch) : _group_handle(std::move(ch)) {}
///Construct the group from a native_handle
explicit group(native_handle_t & handle) : _group_handle(handle) {};
group(const group&) = delete;
///Move constructor
group(group && lhs)
: _group_handle(std::move(lhs._group_handle)),
_attached (lhs._attached)
{
lhs._attached = false;
}
///Default constructor
group() = default;
group& operator=(const group&) = delete;
///Move assign
group& operator=(group && lhs)
{
_group_handle= std::move(lhs._group_handle);
_attached = lhs._attached;
return *this;
};
///Detach the group
void detach() {_attached = false; }
/** Join the child. This just calls wait, but that way the naming is similar to std::thread */
void join() {wait();}
/** Check if the child is joinable. */
bool joinable() {return _attached;}
/** Destructor
*
* \note If the destructor is called without a previous detach or wait, the group will be terminated.
*
*/
~group()
{
std::error_code ec;
if ( _attached && valid())
terminate(ec);
}
///Obtain the native handle of the group.
native_handle_t native_handle() const { return _group_handle.handle(); }
///Wait for the process group to exit.
void wait()
{
boost::process::detail::api::wait(_group_handle);
}
///\overload void wait()
void wait(std::error_code & ec) noexcept
{
boost::process::detail::api::wait(_group_handle, ec);
}
/** Wait for the process group to exit for period of time.
* \return True if all child processes exited while waiting.*/
template< class Rep, class Period >
bool wait_for (const std::chrono::duration<Rep, Period>& rel_time)
{
return boost::process::detail::api::wait_for(_group_handle, rel_time);
}
/** \overload bool wait_for(const std::chrono::duration<Rep, Period>& timeout_time ) */
template< class Rep, class Period >
bool wait_for (const std::chrono::duration<Rep, Period>& rel_time, std::error_code & ec) noexcept
{
return boost::process::detail::api::wait_for(_group_handle, rel_time, ec);
}
/** Wait for the process group to exit until a point in time.
* \return True if all child processes exited while waiting.*/
template< class Clock, class Duration >
bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time )
{
return boost::process::detail::api::wait_until(_group_handle, timeout_time);
}
/** \overload bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time ) */
template< class Clock, class Duration >
bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time, std::error_code & ec) noexcept
{
return boost::process::detail::api::wait_until(_group_handle, timeout_time, ec);
}
///Check if the group has a valid handle.
bool valid() const
{
return _group_handle.valid();
}
///Convenience to call valid.
explicit operator bool() const {return valid();}
///Terminate the process group, i.e. all processes in the group
void terminate()
{
::boost::process::detail::api::terminate(_group_handle);
}
///\overload void terminate()
void terminate(std::error_code & ec) noexcept
{
::boost::process::detail::api::terminate(_group_handle, ec);
}
///Assign a child process to the group
void add(const child &c)
{
_group_handle.add(c.native_handle());
}
///\overload void assign(const child & c)
void add(const child &c, std::error_code & ec) noexcept
{
_group_handle.add(c.native_handle(), ec);
}
///Check if the child process is in the group
bool has(const child &c)
{
return _group_handle.has(c.native_handle());
}
///\overload bool has(const child &)
bool has(const child &c, std::error_code & ec) noexcept
{
return _group_handle.has(c.native_handle(), ec);
}
friend struct detail::group_builder;
};
namespace detail
{
struct group_tag;
struct group_builder
{
group * group_p;
void operator()(group & grp) {this->group_p = &grp;};
typedef api::group_ref result_type;
api::group_ref get_initializer() {return api::group_ref (group_p->_group_handle);};
};
template<>
struct initializer_tag<group>
{
typedef group_tag type;
};
template<>
struct initializer_builder<group_tag>
{
typedef group_builder type;
};
}
}}
#endif
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