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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/strand.hpp
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Merge lime output into next branch
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diff --git a/lib/asio/strand.hpp b/lib/asio/strand.hpp
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-//
-// strand.hpp
-// ~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_STRAND_HPP
-#define ASIO_STRAND_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/strand_executor_service.hpp"
-#include "asio/detail/type_traits.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// Provides serialised function invocation for any executor type.
-template <typename Executor>
-class strand
-{
-public:
- /// The type of the underlying executor.
- typedef Executor inner_executor_type;
-
- /// Default constructor.
- /**
- * This constructor is only valid if the underlying executor type is default
- * constructible.
- */
- strand()
- : executor_(),
- impl_(use_service<detail::strand_executor_service>(
- executor_.context()).create_implementation())
- {
- }
-
- /// Construct a strand for the specified executor.
- explicit strand(const Executor& e)
- : executor_(e),
- impl_(use_service<detail::strand_executor_service>(
- executor_.context()).create_implementation())
- {
- }
-
- /// Copy constructor.
- strand(const strand& other) ASIO_NOEXCEPT
- : executor_(other.executor_),
- impl_(other.impl_)
- {
- }
-
- /// Converting constructor.
- /**
- * This constructor is only valid if the @c OtherExecutor type is convertible
- * to @c Executor.
- */
- template <class OtherExecutor>
- strand(
- const strand<OtherExecutor>& other) ASIO_NOEXCEPT
- : executor_(other.executor_),
- impl_(other.impl_)
- {
- }
-
- /// Assignment operator.
- strand& operator=(const strand& other) ASIO_NOEXCEPT
- {
- executor_ = other.executor_;
- impl_ = other.impl_;
- return *this;
- }
-
- /// Converting assignment operator.
- /**
- * This assignment operator is only valid if the @c OtherExecutor type is
- * convertible to @c Executor.
- */
- template <class OtherExecutor>
- strand& operator=(
- const strand<OtherExecutor>& other) ASIO_NOEXCEPT
- {
- executor_ = other.executor_;
- impl_ = other.impl_;
- return *this;
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move constructor.
- strand(strand&& other) ASIO_NOEXCEPT
- : executor_(ASIO_MOVE_CAST(Executor)(other.executor_)),
- impl_(ASIO_MOVE_CAST(implementation_type)(other.impl_))
- {
- }
-
- /// Converting move constructor.
- /**
- * This constructor is only valid if the @c OtherExecutor type is convertible
- * to @c Executor.
- */
- template <class OtherExecutor>
- strand(strand<OtherExecutor>&& other) ASIO_NOEXCEPT
- : executor_(ASIO_MOVE_CAST(OtherExecutor)(other)),
- impl_(ASIO_MOVE_CAST(implementation_type)(other.impl_))
- {
- }
-
- /// Move assignment operator.
- strand& operator=(strand&& other) ASIO_NOEXCEPT
- {
- executor_ = ASIO_MOVE_CAST(Executor)(other);
- impl_ = ASIO_MOVE_CAST(implementation_type)(other.impl_);
- return *this;
- }
-
- /// Converting move assignment operator.
- /**
- * This assignment operator is only valid if the @c OtherExecutor type is
- * convertible to @c Executor.
- */
- template <class OtherExecutor>
- strand& operator=(
- const strand<OtherExecutor>&& other) ASIO_NOEXCEPT
- {
- executor_ = ASIO_MOVE_CAST(OtherExecutor)(other);
- impl_ = ASIO_MOVE_CAST(implementation_type)(other.impl_);
- return *this;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Destructor.
- ~strand()
- {
- }
-
- /// Obtain the underlying executor.
- inner_executor_type get_inner_executor() const ASIO_NOEXCEPT
- {
- return executor_;
- }
-
- /// Obtain the underlying execution context.
- execution_context& context() const ASIO_NOEXCEPT
- {
- return executor_.context();
- }
-
- /// Inform the strand that it has some outstanding work to do.
- /**
- * The strand delegates this call to its underlying executor.
- */
- void on_work_started() const ASIO_NOEXCEPT
- {
- executor_.on_work_started();
- }
-
- /// Inform the strand that some work is no longer outstanding.
- /**
- * The strand delegates this call to its underlying executor.
- */
- void on_work_finished() const ASIO_NOEXCEPT
- {
- executor_.on_work_finished();
- }
-
- /// Request the strand to invoke the given function object.
- /**
- * This function is used to ask the strand to execute the given function
- * object on its underlying executor. The function object will be executed
- * inside this function if the strand is not otherwise busy and if the
- * underlying executor's @c dispatch() function is also able to execute the
- * function before returning.
- *
- * @param f The function object to be called. The executor will make
- * a copy of the handler object as required. The function signature of the
- * function object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const
- {
- detail::strand_executor_service::dispatch(impl_,
- executor_, ASIO_MOVE_CAST(Function)(f), a);
- }
-
- /// Request the strand to invoke the given function object.
- /**
- * This function is used to ask the executor to execute the given function
- * object. The function object will never be executed inside this function.
- * Instead, it will be scheduled by the underlying executor's defer function.
- *
- * @param f The function object to be called. The executor will make
- * a copy of the handler object as required. The function signature of the
- * function object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const
- {
- detail::strand_executor_service::post(impl_,
- executor_, ASIO_MOVE_CAST(Function)(f), a);
- }
-
- /// Request the strand to invoke the given function object.
- /**
- * This function is used to ask the executor to execute the given function
- * object. The function object will never be executed inside this function.
- * Instead, it will be scheduled by the underlying executor's defer function.
- *
- * @param f The function object to be called. The executor will make
- * a copy of the handler object as required. The function signature of the
- * function object must be: @code void function(); @endcode
- *
- * @param a An allocator that may be used by the executor to allocate the
- * internal storage needed for function invocation.
- */
- template <typename Function, typename Allocator>
- void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const
- {
- detail::strand_executor_service::defer(impl_,
- executor_, ASIO_MOVE_CAST(Function)(f), a);
- }
-
- /// Determine whether the strand is running in the current thread.
- /**
- * @return @c true if the current thread is executing a function that was
- * submitted to the strand using post(), dispatch() or defer(). Otherwise
- * returns @c false.
- */
- bool running_in_this_thread() const ASIO_NOEXCEPT
- {
- return detail::strand_executor_service::running_in_this_thread(impl_);
- }
-
- /// Compare two strands for equality.
- /**
- * Two strands are equal if they refer to the same ordered, non-concurrent
- * state.
- */
- friend bool operator==(const strand& a, const strand& b) ASIO_NOEXCEPT
- {
- return a.impl_ == b.impl_;
- }
-
- /// Compare two strands for inequality.
- /**
- * Two strands are equal if they refer to the same ordered, non-concurrent
- * state.
- */
- friend bool operator!=(const strand& a, const strand& b) ASIO_NOEXCEPT
- {
- return a.impl_ != b.impl_;
- }
-
-private:
- Executor executor_;
- typedef detail::strand_executor_service::implementation_type
- implementation_type;
- implementation_type impl_;
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-// If both io_context.hpp and strand.hpp have been included, automatically
-// include the header file needed for the io_context::strand class.
-#if !defined(ASIO_NO_EXTENSIONS)
-# if defined(ASIO_IO_CONTEXT_HPP)
-# include "asio/io_context_strand.hpp"
-# endif // defined(ASIO_IO_CONTEXT_HPP)
-#endif // !defined(ASIO_NO_EXTENSIONS)
-
-#endif // ASIO_STRAND_HPP