boost/asio/impl/system_executor.hpp
//
// impl/system_executor.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2024 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_SYSTEM_EXECUTOR_HPP
#define BOOST_ASIO_IMPL_SYSTEM_EXECUTOR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/executor_op.hpp>
#include <boost/asio/detail/global.hpp>
#include <boost/asio/detail/type_traits.hpp>
#include <boost/asio/system_context.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
template <typename Blocking, typename Relationship, typename Allocator>
inline system_context&
basic_system_executor<Blocking, Relationship, Allocator>::query(
execution::context_t) noexcept
{
return detail::global<system_context>();
}
template <typename Blocking, typename Relationship, typename Allocator>
inline std::size_t
basic_system_executor<Blocking, Relationship, Allocator>::query(
execution::occupancy_t) const noexcept
{
return detail::global<system_context>().num_threads_;
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function>
inline void
basic_system_executor<Blocking, Relationship, Allocator>::do_execute(
Function&& f, execution::blocking_t::possibly_t) const
{
// Obtain a non-const instance of the function.
detail::non_const_lvalue<Function> f2(f);
#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
try
{
#endif// !defined(BOOST_ASIO_NO_EXCEPTIONS)
detail::fenced_block b(detail::fenced_block::full);
static_cast<decay_t<Function>&&>(f2.value)();
#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
}
catch (...)
{
std::terminate();
}
#endif// !defined(BOOST_ASIO_NO_EXCEPTIONS)
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function>
inline void
basic_system_executor<Blocking, Relationship, Allocator>::do_execute(
Function&& f, execution::blocking_t::always_t) const
{
// Obtain a non-const instance of the function.
detail::non_const_lvalue<Function> f2(f);
#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
try
{
#endif// !defined(BOOST_ASIO_NO_EXCEPTIONS)
detail::fenced_block b(detail::fenced_block::full);
static_cast<decay_t<Function>&&>(f2.value)();
#if !defined(BOOST_ASIO_NO_EXCEPTIONS)
}
catch (...)
{
std::terminate();
}
#endif// !defined(BOOST_ASIO_NO_EXCEPTIONS)
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function>
void basic_system_executor<Blocking, Relationship, Allocator>::do_execute(
Function&& f, execution::blocking_t::never_t) const
{
system_context& ctx = detail::global<system_context>();
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<decay_t<Function>, Allocator> op;
typename op::ptr p = { detail::addressof(allocator_),
op::ptr::allocate(allocator_), 0 };
p.p = new (p.v) op(static_cast<Function&&>(f), allocator_);
if (is_same<Relationship, execution::relationship_t::continuation_t>::value)
{
BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
"system_executor", &ctx, 0, "execute(blk=never,rel=cont)"));
}
else
{
BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
"system_executor", &ctx, 0, "execute(blk=never,rel=fork)"));
}
ctx.scheduler_.post_immediate_completion(p.p,
is_same<Relationship, execution::relationship_t::continuation_t>::value);
p.v = p.p = 0;
}
#if !defined(BOOST_ASIO_NO_TS_EXECUTORS)
template <typename Blocking, typename Relationship, typename Allocator>
inline system_context& basic_system_executor<
Blocking, Relationship, Allocator>::context() const noexcept
{
return detail::global<system_context>();
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function, typename OtherAllocator>
void basic_system_executor<Blocking, Relationship, Allocator>::dispatch(
Function&& f, const OtherAllocator&) const
{
decay_t<Function>(static_cast<Function&&>(f))();
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function, typename OtherAllocator>
void basic_system_executor<Blocking, Relationship, Allocator>::post(
Function&& f, const OtherAllocator& a) const
{
system_context& ctx = detail::global<system_context>();
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<decay_t<Function>, OtherAllocator> op;
typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
p.p = new (p.v) op(static_cast<Function&&>(f), a);
BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
"system_executor", &this->context(), 0, "post"));
ctx.scheduler_.post_immediate_completion(p.p, false);
p.v = p.p = 0;
}
template <typename Blocking, typename Relationship, typename Allocator>
template <typename Function, typename OtherAllocator>
void basic_system_executor<Blocking, Relationship, Allocator>::defer(
Function&& f, const OtherAllocator& a) const
{
system_context& ctx = detail::global<system_context>();
// Allocate and construct an operation to wrap the function.
typedef detail::executor_op<decay_t<Function>, OtherAllocator> op;
typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
p.p = new (p.v) op(static_cast<Function&&>(f), a);
BOOST_ASIO_HANDLER_CREATION((ctx, *p.p,
"system_executor", &this->context(), 0, "defer"));
ctx.scheduler_.post_immediate_completion(p.p, true);
p.v = p.p = 0;
}
#endif // !defined(BOOST_ASIO_NO_TS_EXECUTORS)
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_IMPL_SYSTEM_EXECUTOR_HPP