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//
// detail/thread_group.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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_THREAD_GROUP_HPP
#define ASIO_DETAIL_THREAD_GROUP_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/scoped_ptr.hpp"
#include "asio/detail/thread.hpp"
namespace asio {
namespace detail {
class thread_group
{
public:
// Constructor initialises an empty thread group.
thread_group()
: first_(0)
{
}
// Destructor joins any remaining threads in the group.
~thread_group()
{
join();
}
// Create a new thread in the group.
template <typename Function>
void create_thread(Function f)
{
first_ = new item(f, first_);
}
// Create new threads in the group.
template <typename Function>
void create_threads(Function f, std::size_t num_threads)
{
for (std::size_t i = 0; i < num_threads; ++i)
create_thread(f);
}
// Wait for all threads in the group to exit.
void join()
{
while (first_)
{
first_->thread_.join();
item* tmp = first_;
first_ = first_->next_;
delete tmp;
}
}
private:
// Structure used to track a single thread in the group.
struct item
{
template <typename Function>
explicit item(Function f, item* next)
: thread_(f),
next_(next)
{
}
asio::detail::thread thread_;
item* next_;
};
// The first thread in the group.
item* first_;
};
} // namespace detail
} // namespace asio
#endif // ASIO_DETAIL_THREAD_GROUP_HPP
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