boost/asio/impl/io_context.hpp
//
// impl/io_context.hpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 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 BOOST_ASIO_IMPL_IO_CONTEXT_HPP
#define BOOST_ASIO_IMPL_IO_CONTEXT_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/completion_handler.hpp>
#include <boost/asio/detail/executor_op.hpp>
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/handler_type_requirements.hpp>
#include <boost/asio/detail/non_const_lvalue.hpp>
#include <boost/asio/detail/recycling_allocator.hpp>
#include <boost/asio/detail/service_registry.hpp>
#include <boost/asio/detail/throw_error.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/detail/push_options.hpp>
#if !defined(GENERATING_DOCUMENTATION)
namespace boost {
namespace asio {
template <typename Service>
inline Service& use_service(io_context& ioc)
{
// Check that Service meets the necessary type requirements.
(void)static_cast<execution_context::service*>(static_cast<Service*>(0));
(void)static_cast<const execution_context::id*>(&Service::id);
return ioc.service_registry_->template use_service<Service>(ioc);
}
template <>
inline detail::io_context_impl& use_service<detail::io_context_impl>(
io_context& ioc)
{
return ioc.impl_;
}
} // namespace asio
} // namespace boost
#endif // !defined(GENERATING_DOCUMENTATION)
#include <boost/asio/detail/pop_options.hpp>
#if defined(BOOST_ASIO_HAS_IOCP)
# include <boost/asio/detail/win_iocp_io_context.hpp>
#else
# include <boost/asio/detail/scheduler.hpp>
#endif
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
inline io_context::executor_type
io_context::get_executor() BOOST_ASIO_NOEXCEPT
{
return executor_type(*this);
}
#if defined(BOOST_ASIO_HAS_CHRONO)
template <typename Rep, typename Period>
std::size_t io_context::run_for(
const chrono::duration<Rep, Period>& rel_time)
{
return this->run_until(chrono::steady_clock::now() + rel_time);
}
template <typename Clock, typename Duration>
std::size_t io_context::run_until(
const chrono::time_point<Clock, Duration>& abs_time)
{
std::size_t n = 0;
while (this->run_one_until(abs_time))
if (n != (std::numeric_limits<std::size_t>::max)())
++n;
return n;
}
template <typename Rep, typename Period>
std::size_t io_context::run_one_for(
const chrono::duration<Rep, Period>& rel_time)
{
return this->run_one_until(chrono::steady_clock::now() + rel_time);
}
template <typename Clock, typename Duration>
std::size_t io_context::run_one_until(
const chrono::time_point<Clock, Duration>& abs_time)
{
typename Clock::time_point now = Clock::now();
while (now < abs_time)
{
typename Clock::duration rel_time = abs_time - now;
if (rel_time > chrono::seconds(1))
rel_time = chrono::seconds(1);
boost::system::error_code ec;
std::size_t s = impl_.wait_one(
static_cast<long>(chrono::duration_cast<
chrono::microseconds>(rel_time).count()), ec);
boost::asio::detail::throw_error(ec);
if (s || impl_.stopped())
return s;
now = Clock::now();
}
return 0;
}
#endif // defined(BOOST_ASIO_HAS_CHRONO)
#if !defined(BOOST_ASIO_NO_DEPRECATED)
inline void io_context::reset()
{
restart();
}
struct io_context::initiate_dispatch
{
template <typename LegacyCompletionHandler>
void operator()(BOOST_ASIO_MOVE_ARG(LegacyCompletionHandler) handler,
io_context* self) const
{
// If you get an error on the following line it means that your handler does
// not meet the documented type requirements for a LegacyCompletionHandler.
BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
LegacyCompletionHandler, handler) type_check;
detail::non_const_lvalue<LegacyCompletionHandler> handler2(handler);
if (self->impl_.can_dispatch())
{
detail::fenced_block b(detail::fenced_block::full);
boost_asio_handler_invoke_helpers::invoke(
handler2.value, handler2.value);
}
else
{
// Allocate and construct an operation to wrap the handler.
typedef detail::completion_handler<
typename decay<LegacyCompletionHandler>::type> op;
typename op::ptr p = { detail::addressof(handler2.value),
op::ptr::allocate(handler2.value), 0 };
p.p = new (p.v) op(handler2.value);
BOOST_ASIO_HANDLER_CREATION((*self, *p.p,
"io_context", self, 0, "dispatch"));
self->impl_.do_dispatch(p.p);
p.v = p.p = 0;
}
}
};
template <typename LegacyCompletionHandler>
BOOST_ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
io_context::dispatch(BOOST_ASIO_MOVE_ARG(LegacyCompletionHandler) handler)
{
return async_initiate<LegacyCompletionHandler, void ()>(
initiate_dispatch(), handler, this);
}
struct io_context::initiate_post
{
template <typename LegacyCompletionHandler>
void operator()(BOOST_ASIO_MOVE_ARG(LegacyCompletionHandler) handler,
io_context* self) const
{
// If you get an error on the following line it means that your handler does
// not meet the documented type requirements for a LegacyCompletionHandler.
BOOST_ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
LegacyCompletionHandler, handler) type_check;
detail::non_const_lvalue<LegacyCompletionHandler> handler2(handler);
bool is_continuation =
boost_asio_handler_cont_helpers::is_continuation(handler2.value);
// Allocate and construct an operation to wrap the handler.
typedef detail::completion_handler<
typename decay<LegacyCompletionHandler>::type> op;
typename op::ptr p = { detail::addressof(handler2.value),
op::ptr::allocate(handler2.value), 0 };
p.p = new (p.v) op(handler2.value);
BOOST_ASIO_HANDLER_CREATION((*self, *p.p,
"io_context", self, 0, "post"));
self->impl_.post_immediate_completion(p.p, is_continuation);
p.v = p.p = 0;
}
};
template <typename LegacyCompletionHandler>
BOOST_ASIO_INITFN_RESULT_TYPE(LegacyCompletionHandler, void ())
io_context::post(BOOST_ASIO_MOVE_ARG(LegacyCompletionHandler) handler)
{
return async_initiate<LegacyCompletionHandler, void ()>(
initiate_post(), handler, this);
}
template <typename Handler>
#if defined(GENERATING_DOCUMENTATION)
unspecified
#else
inline detail::wrapped_handler<io_context&, Handler>
#endif
io_context::wrap(Handler handler)
{
return detail::wrapped_handler<io_context&, Handler>(*this, handler);
}
#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
inline io_context&
io_context::executor_type::context() const BOOST_ASIO_NOEXCEPT
{
return io_context_;
}
inline void
io_context::executor_type::on_work_started() const BOOST_ASIO_NOEXCEPT
{
io_context_.impl_.work_started();
}
inline void
io_context::executor_type::on_work_finished() const BOOST_ASIO_NOEXCEPT
{
io_context_.impl_.work_finished();
}
template <typename Function, typename Allocator>
void io_context::executor_type::dispatch(
BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
{
typedef typename decay<Function>::type function_type;
// Invoke immediately if we are already inside the thread pool.
if (io_context_.impl_.can_dispatch())
{
// Make a local, non-const copy of the function.
function_type tmp(BOOST_ASIO_MOVE_CAST(Function)(f));
detail::fenced_block b(detail::fenced_block::full);
boost_asio_handler_invoke_helpers::invoke(tmp, tmp);
return;
}
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<function_type, Allocator, detail::operation> op;
typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
BOOST_ASIO_HANDLER_CREATION((this->context(), *p.p,
"io_context", &this->context(), 0, "dispatch"));
io_context_.impl_.post_immediate_completion(p.p, false);
p.v = p.p = 0;
}
template <typename Function, typename Allocator>
void io_context::executor_type::post(
BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
{
typedef typename decay<Function>::type function_type;
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<function_type, Allocator, detail::operation> op;
typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
BOOST_ASIO_HANDLER_CREATION((this->context(), *p.p,
"io_context", &this->context(), 0, "post"));
io_context_.impl_.post_immediate_completion(p.p, false);
p.v = p.p = 0;
}
template <typename Function, typename Allocator>
void io_context::executor_type::defer(
BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
{
typedef typename decay<Function>::type function_type;
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<function_type, Allocator, detail::operation> op;
typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
BOOST_ASIO_HANDLER_CREATION((this->context(), *p.p,
"io_context", &this->context(), 0, "defer"));
io_context_.impl_.post_immediate_completion(p.p, true);
p.v = p.p = 0;
}
inline bool
io_context::executor_type::running_in_this_thread() const BOOST_ASIO_NOEXCEPT
{
return io_context_.impl_.can_dispatch();
}
#if !defined(BOOST_ASIO_NO_DEPRECATED)
inline io_context::work::work(boost::asio::io_context& io_context)
: io_context_impl_(io_context.impl_)
{
io_context_impl_.work_started();
}
inline io_context::work::work(const work& other)
: io_context_impl_(other.io_context_impl_)
{
io_context_impl_.work_started();
}
inline io_context::work::~work()
{
io_context_impl_.work_finished();
}
inline boost::asio::io_context& io_context::work::get_io_context()
{
return static_cast<boost::asio::io_context&>(io_context_impl_.context());
}
#endif // !defined(BOOST_ASIO_NO_DEPRECATED)
inline boost::asio::io_context& io_context::service::get_io_context()
{
return static_cast<boost::asio::io_context&>(context());
}
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_IMPL_IO_CONTEXT_HPP