resolver_service_base.ipp
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//
// detail/impl/resolver_service_base.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// 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_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP
#define ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/resolver_service_base.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class resolver_service_base::work_scheduler_runner
{
public:
work_scheduler_runner(scheduler_impl& work_scheduler)
: work_scheduler_(work_scheduler)
{
}
void operator()()
{
asio::error_code ec;
work_scheduler_.run(ec);
}
private:
scheduler_impl& work_scheduler_;
};
resolver_service_base::resolver_service_base(execution_context& context)
: scheduler_(asio::use_service<scheduler_impl>(context)),
work_scheduler_(new scheduler_impl(context, -1, false)),
work_thread_(0)
{
work_scheduler_->work_started();
}
resolver_service_base::~resolver_service_base()
{
base_shutdown();
}
void resolver_service_base::base_shutdown()
{
if (work_scheduler_.get())
{
work_scheduler_->work_finished();
work_scheduler_->stop();
if (work_thread_.get())
{
work_thread_->join();
work_thread_.reset();
}
work_scheduler_.reset();
}
}
void resolver_service_base::base_notify_fork(
execution_context::fork_event fork_ev)
{
if (work_thread_.get())
{
if (fork_ev == execution_context::fork_prepare)
{
work_scheduler_->stop();
work_thread_->join();
work_thread_.reset();
}
}
else if (fork_ev != execution_context::fork_prepare)
{
work_scheduler_->restart();
}
}
void resolver_service_base::construct(
resolver_service_base::implementation_type& impl)
{
impl.reset(static_cast<void*>(0), socket_ops::noop_deleter());
}
void resolver_service_base::destroy(
resolver_service_base::implementation_type& impl)
{
ASIO_HANDLER_OPERATION((scheduler_.context(),
"resolver", &impl, 0, "cancel"));
impl.reset();
}
void resolver_service_base::move_construct(implementation_type& impl,
implementation_type& other_impl)
{
impl = ASIO_MOVE_CAST(implementation_type)(other_impl);
}
void resolver_service_base::move_assign(implementation_type& impl,
resolver_service_base&, implementation_type& other_impl)
{
destroy(impl);
impl = ASIO_MOVE_CAST(implementation_type)(other_impl);
}
void resolver_service_base::cancel(
resolver_service_base::implementation_type& impl)
{
ASIO_HANDLER_OPERATION((scheduler_.context(),
"resolver", &impl, 0, "cancel"));
impl.reset(static_cast<void*>(0), socket_ops::noop_deleter());
}
void resolver_service_base::start_resolve_op(resolve_op* op)
{
if (ASIO_CONCURRENCY_HINT_IS_LOCKING(SCHEDULER,
scheduler_.concurrency_hint()))
{
start_work_thread();
scheduler_.work_started();
work_scheduler_->post_immediate_completion(op, false);
}
else
{
op->ec_ = asio::error::operation_not_supported;
scheduler_.post_immediate_completion(op, false);
}
}
void resolver_service_base::start_work_thread()
{
asio::detail::mutex::scoped_lock lock(mutex_);
if (!work_thread_.get())
{
work_thread_.reset(new asio::detail::thread(
work_scheduler_runner(*work_scheduler_)));
}
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_IMPL_RESOLVER_SERVICE_BASE_IPP