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+//
+// impl/io_context.hpp
+// ~~~~~~~~~~~~~~~~~~~
+//
+// 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_IO_CONTEXT_HPP
+#define ASIO_IMPL_IO_CONTEXT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/completion_handler.hpp"
+#include "asio/detail/executor_op.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/handler_type_requirements.hpp"
+#include "asio/detail/non_const_lvalue.hpp"
+#include "asio/detail/service_registry.hpp"
+#include "asio/detail/throw_error.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+#if !defined(GENERATING_DOCUMENTATION)
+
+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_;
+}
+
+#endif // !defined(GENERATING_DOCUMENTATION)
+
+inline io_context::executor_type
+io_context::get_executor() ASIO_NOEXCEPT
+{
+ return executor_type(*this);
+}
+
+#if defined(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);
+
+ asio::error_code ec;
+ std::size_t s = impl_.wait_one(
+ static_cast<long>(chrono::duration_cast<
+ chrono::microseconds>(rel_time).count()), ec);
+ asio::detail::throw_error(ec);
+
+ if (s || impl_.stopped())
+ return s;
+
+ now = Clock::now();
+ }
+
+ return 0;
+}
+
+#endif // defined(ASIO_HAS_CHRONO)
+
+#if !defined(ASIO_NO_DEPRECATED)
+
+inline void io_context::reset()
+{
+ restart();
+}
+
+struct io_context::initiate_dispatch
+{
+ template <typename LegacyCompletionHandler>
+ void operator()(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.
+ 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);
+ 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, executor_type> op;
+ typename op::ptr p = { detail::addressof(handler2.value),
+ op::ptr::allocate(handler2.value), 0 };
+ p.p = new (p.v) op(handler2.value, self->get_executor());
+
+ 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>
+ASIO_INITFN_AUTO_RESULT_TYPE(LegacyCompletionHandler, void ())
+io_context::dispatch(ASIO_MOVE_ARG(LegacyCompletionHandler) handler)
+{
+ return async_initiate<LegacyCompletionHandler, void ()>(
+ initiate_dispatch(), handler, this);
+}
+
+struct io_context::initiate_post
+{
+ template <typename LegacyCompletionHandler>
+ void operator()(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.
+ ASIO_LEGACY_COMPLETION_HANDLER_CHECK(
+ LegacyCompletionHandler, handler) type_check;
+
+ detail::non_const_lvalue<LegacyCompletionHandler> handler2(handler);
+
+ bool is_continuation =
+ 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, executor_type> op;
+ typename op::ptr p = { detail::addressof(handler2.value),
+ op::ptr::allocate(handler2.value), 0 };
+ p.p = new (p.v) op(handler2.value, self->get_executor());
+
+ 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>
+ASIO_INITFN_AUTO_RESULT_TYPE(LegacyCompletionHandler, void ())
+io_context::post(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(ASIO_NO_DEPRECATED)
+
+template <typename Allocator, unsigned int Bits>
+io_context::basic_executor_type<Allocator, Bits>&
+io_context::basic_executor_type<Allocator, Bits>::operator=(
+ const basic_executor_type& other) ASIO_NOEXCEPT
+{
+ if (this != &other)
+ {
+ io_context* old_io_context = io_context_;
+ io_context_ = other.io_context_;
+ allocator_ = other.allocator_;
+ bits_ = other.bits_;
+ if (Bits & outstanding_work_tracked)
+ {
+ if (io_context_)
+ io_context_->impl_.work_started();
+ if (old_io_context)
+ old_io_context->impl_.work_finished();
+ }
+ }
+ return *this;
+}
+
+#if defined(ASIO_HAS_MOVE)
+template <typename Allocator, unsigned int Bits>
+io_context::basic_executor_type<Allocator, Bits>&
+io_context::basic_executor_type<Allocator, Bits>::operator=(
+ basic_executor_type&& other) ASIO_NOEXCEPT
+{
+ if (this != &other)
+ {
+ io_context* old_io_context = io_context_;
+ io_context_ = other.io_context_;
+ allocator_ = std::move(other.allocator_);
+ bits_ = other.bits_;
+ if (Bits & outstanding_work_tracked)
+ {
+ other.io_context_ = 0;
+ if (old_io_context)
+ old_io_context->impl_.work_finished();
+ }
+ }
+ return *this;
+}
+#endif // defined(ASIO_HAS_MOVE)
+
+template <typename Allocator, unsigned int Bits>
+inline bool io_context::basic_executor_type<Allocator,
+ Bits>::running_in_this_thread() const ASIO_NOEXCEPT
+{
+ return io_context_->impl_.can_dispatch();
+}
+
+template <typename Allocator, unsigned int Bits>
+template <typename Function>
+void io_context::basic_executor_type<Allocator, Bits>::execute(
+ ASIO_MOVE_ARG(Function) f) const
+{
+ typedef typename decay<Function>::type function_type;
+
+ // Invoke immediately if the blocking.possibly property is enabled and we are
+ // already inside the thread pool.
+ if ((bits_ & blocking_never) == 0 && io_context_->impl_.can_dispatch())
+ {
+ // Make a local, non-const copy of the function.
+ function_type tmp(ASIO_MOVE_CAST(Function)(f));
+
+#if defined(ASIO_HAS_STD_EXCEPTION_PTR) \
+ && !defined(ASIO_NO_EXCEPTIONS)
+ try
+ {
+#endif // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+ // && !defined(ASIO_NO_EXCEPTIONS)
+ detail::fenced_block b(detail::fenced_block::full);
+ asio_handler_invoke_helpers::invoke(tmp, tmp);
+ return;
+#if defined(ASIO_HAS_STD_EXCEPTION_PTR) \
+ && !defined(ASIO_NO_EXCEPTIONS)
+ }
+ catch (...)
+ {
+ io_context_->impl_.capture_current_exception();
+ return;
+ }
+#endif // defined(ASIO_HAS_STD_EXCEPTION_PTR)
+ // && !defined(ASIO_NO_EXCEPTIONS)
+ }
+
+ // 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(allocator_),
+ op::ptr::allocate(allocator_), 0 };
+ p.p = new (p.v) op(ASIO_MOVE_CAST(Function)(f), allocator_);
+
+ ASIO_HANDLER_CREATION((*io_context_, *p.p,
+ "io_context", io_context_, 0, "execute"));
+
+ io_context_->impl_.post_immediate_completion(p.p,
+ (bits_ & relationship_continuation) != 0);
+ p.v = p.p = 0;
+}
+
+#if !defined(ASIO_NO_TS_EXECUTORS)
+template <typename Allocator, unsigned int Bits>
+inline io_context& io_context::basic_executor_type<
+ Allocator, Bits>::context() const ASIO_NOEXCEPT
+{
+ return *io_context_;
+}
+
+template <typename Allocator, unsigned int Bits>
+inline void io_context::basic_executor_type<Allocator,
+ Bits>::on_work_started() const ASIO_NOEXCEPT
+{
+ io_context_->impl_.work_started();
+}
+
+template <typename Allocator, unsigned int Bits>
+inline void io_context::basic_executor_type<Allocator,
+ Bits>::on_work_finished() const ASIO_NOEXCEPT
+{
+ io_context_->impl_.work_finished();
+}
+
+template <typename Allocator, unsigned int Bits>
+template <typename Function, typename OtherAllocator>
+void io_context::basic_executor_type<Allocator, Bits>::dispatch(
+ ASIO_MOVE_ARG(Function) f, const OtherAllocator& 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(ASIO_MOVE_CAST(Function)(f));
+
+ detail::fenced_block b(detail::fenced_block::full);
+ asio_handler_invoke_helpers::invoke(tmp, tmp);
+ return;
+ }
+
+ // Allocate and construct an operation to wrap the function.
+ typedef detail::executor_op<function_type,
+ OtherAllocator, detail::operation> op;
+ typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+ p.p = new (p.v) op(ASIO_MOVE_CAST(Function)(f), a);
+
+ ASIO_HANDLER_CREATION((*io_context_, *p.p,
+ "io_context", io_context_, 0, "dispatch"));
+
+ io_context_->impl_.post_immediate_completion(p.p, false);
+ p.v = p.p = 0;
+}
+
+template <typename Allocator, unsigned int Bits>
+template <typename Function, typename OtherAllocator>
+void io_context::basic_executor_type<Allocator, Bits>::post(
+ ASIO_MOVE_ARG(Function) f, const OtherAllocator& a) const
+{
+ typedef typename decay<Function>::type function_type;
+
+ // Allocate and construct an operation to wrap the function.
+ typedef detail::executor_op<function_type,
+ OtherAllocator, detail::operation> op;
+ typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+ p.p = new (p.v) op(ASIO_MOVE_CAST(Function)(f), a);
+
+ ASIO_HANDLER_CREATION((*io_context_, *p.p,
+ "io_context", io_context_, 0, "post"));
+
+ io_context_->impl_.post_immediate_completion(p.p, false);
+ p.v = p.p = 0;
+}
+
+template <typename Allocator, unsigned int Bits>
+template <typename Function, typename OtherAllocator>
+void io_context::basic_executor_type<Allocator, Bits>::defer(
+ ASIO_MOVE_ARG(Function) f, const OtherAllocator& a) const
+{
+ typedef typename decay<Function>::type function_type;
+
+ // Allocate and construct an operation to wrap the function.
+ typedef detail::executor_op<function_type,
+ OtherAllocator, detail::operation> op;
+ typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+ p.p = new (p.v) op(ASIO_MOVE_CAST(Function)(f), a);
+
+ ASIO_HANDLER_CREATION((*io_context_, *p.p,
+ "io_context", io_context_, 0, "defer"));
+
+ io_context_->impl_.post_immediate_completion(p.p, true);
+ p.v = p.p = 0;
+}
+#endif // !defined(ASIO_NO_TS_EXECUTORS)
+
+#if !defined(ASIO_NO_DEPRECATED)
+inline io_context::work::work(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 asio::io_context& io_context::work::get_io_context()
+{
+ return static_cast<asio::io_context&>(io_context_impl_.context());
+}
+#endif // !defined(ASIO_NO_DEPRECATED)
+
+inline asio::io_context& io_context::service::get_io_context()
+{
+ return static_cast<asio::io_context&>(context());
+}
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_IMPL_IO_CONTEXT_HPP