142 lines
2.9 KiB
C++
142 lines
2.9 KiB
C++
//
|
|
// impl/thread_pool.ipp
|
|
// ~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2021 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_IMPL_THREAD_POOL_IPP
|
|
#define ASIO_IMPL_THREAD_POOL_IPP
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
# pragma once
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
|
|
#include "asio/detail/config.hpp"
|
|
#include <stdexcept>
|
|
#include "asio/thread_pool.hpp"
|
|
#include "asio/detail/throw_exception.hpp"
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
|
|
struct thread_pool::thread_function
|
|
{
|
|
detail::scheduler* scheduler_;
|
|
|
|
void operator()()
|
|
{
|
|
#if !defined(ASIO_NO_EXCEPTIONS)
|
|
try
|
|
{
|
|
#endif// !defined(ASIO_NO_EXCEPTIONS)
|
|
asio::error_code ec;
|
|
scheduler_->run(ec);
|
|
#if !defined(ASIO_NO_EXCEPTIONS)
|
|
}
|
|
catch (...)
|
|
{
|
|
std::terminate();
|
|
}
|
|
#endif// !defined(ASIO_NO_EXCEPTIONS)
|
|
}
|
|
};
|
|
|
|
#if !defined(ASIO_NO_TS_EXECUTORS)
|
|
namespace detail {
|
|
|
|
inline long default_thread_pool_size()
|
|
{
|
|
std::size_t num_threads = thread::hardware_concurrency() * 2;
|
|
num_threads = num_threads == 0 ? 2 : num_threads;
|
|
return static_cast<long>(num_threads);
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
thread_pool::thread_pool()
|
|
: scheduler_(add_scheduler(new detail::scheduler(*this, 0, false))),
|
|
num_threads_(detail::default_thread_pool_size())
|
|
{
|
|
scheduler_.work_started();
|
|
|
|
thread_function f = { &scheduler_ };
|
|
threads_.create_threads(f, static_cast<std::size_t>(num_threads_));
|
|
}
|
|
#endif // !defined(ASIO_NO_TS_EXECUTORS)
|
|
|
|
namespace detail {
|
|
|
|
inline long clamp_thread_pool_size(std::size_t n)
|
|
{
|
|
if (n > 0x7FFFFFFF)
|
|
{
|
|
std::out_of_range ex("thread pool size");
|
|
asio::detail::throw_exception(ex);
|
|
}
|
|
return static_cast<long>(n & 0x7FFFFFFF);
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
thread_pool::thread_pool(std::size_t num_threads)
|
|
: scheduler_(add_scheduler(new detail::scheduler(
|
|
*this, num_threads == 1 ? 1 : 0, false))),
|
|
num_threads_(detail::clamp_thread_pool_size(num_threads))
|
|
{
|
|
scheduler_.work_started();
|
|
|
|
thread_function f = { &scheduler_ };
|
|
threads_.create_threads(f, static_cast<std::size_t>(num_threads_));
|
|
}
|
|
|
|
thread_pool::~thread_pool()
|
|
{
|
|
stop();
|
|
join();
|
|
}
|
|
|
|
void thread_pool::stop()
|
|
{
|
|
scheduler_.stop();
|
|
}
|
|
|
|
void thread_pool::attach()
|
|
{
|
|
++num_threads_;
|
|
thread_function f = { &scheduler_ };
|
|
f();
|
|
}
|
|
|
|
void thread_pool::join()
|
|
{
|
|
if (!threads_.empty())
|
|
{
|
|
scheduler_.work_finished();
|
|
threads_.join();
|
|
}
|
|
}
|
|
|
|
detail::scheduler& thread_pool::add_scheduler(detail::scheduler* s)
|
|
{
|
|
detail::scoped_ptr<detail::scheduler> scoped_impl(s);
|
|
asio::add_service<detail::scheduler>(*this, scoped_impl.get());
|
|
return *scoped_impl.release();
|
|
}
|
|
|
|
void thread_pool::wait()
|
|
{
|
|
scheduler_.work_finished();
|
|
threads_.join();
|
|
}
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_IMPL_THREAD_POOL_IPP
|