| // |
| // execution/blocking_adaptation.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // 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_EXECUTION_BLOCKING_ADAPTATION_HPP |
| #define ASIO_EXECUTION_BLOCKING_ADAPTATION_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/event.hpp" |
| #include "asio/detail/mutex.hpp" |
| #include "asio/detail/type_traits.hpp" |
| #include "asio/execution/execute.hpp" |
| #include "asio/execution/executor.hpp" |
| #include "asio/execution/scheduler.hpp" |
| #include "asio/execution/sender.hpp" |
| #include "asio/is_applicable_property.hpp" |
| #include "asio/prefer.hpp" |
| #include "asio/query.hpp" |
| #include "asio/require.hpp" |
| #include "asio/traits/prefer_member.hpp" |
| #include "asio/traits/query_free.hpp" |
| #include "asio/traits/query_member.hpp" |
| #include "asio/traits/query_static_constexpr_member.hpp" |
| #include "asio/traits/require_member.hpp" |
| #include "asio/traits/static_query.hpp" |
| #include "asio/traits/static_require.hpp" |
| |
| #include "asio/detail/push_options.hpp" |
| |
| namespace asio { |
| |
| #if defined(GENERATING_DOCUMENTATION) |
| |
| namespace execution { |
| |
| /// A property to describe whether automatic adaptation of an executor is |
| /// allowed in order to apply the blocking_adaptation_t::allowed_t property. |
| struct blocking_adaptation_t |
| { |
| /// The blocking_adaptation_t property applies to executors, senders, and |
| /// schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The top-level blocking_adaptation_t property cannot be required. |
| static constexpr bool is_requirable = false; |
| |
| /// The top-level blocking_adaptation_t property cannot be preferred. |
| static constexpr bool is_preferable = false; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef blocking_adaptation_t polymorphic_query_result_type; |
| |
| /// A sub-property that indicates that automatic adaptation is not allowed. |
| struct disallowed_t |
| { |
| /// The blocking_adaptation_t::disallowed_t property applies to executors, |
| /// senders, and schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The blocking_adaptation_t::disallowed_t property can be required. |
| static constexpr bool is_requirable = true; |
| |
| /// The blocking_adaptation_t::disallowed_t property can be preferred. |
| static constexpr bool is_preferable = true; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef blocking_adaptation_t polymorphic_query_result_type; |
| |
| /// Default constructor. |
| constexpr disallowed_t(); |
| |
| /// Get the value associated with a property object. |
| /** |
| * @returns disallowed_t(); |
| */ |
| static constexpr blocking_adaptation_t value(); |
| }; |
| |
| /// A sub-property that indicates that automatic adaptation is allowed. |
| struct allowed_t |
| { |
| /// The blocking_adaptation_t::allowed_t property applies to executors, |
| /// senders, and schedulers. |
| template <typename T> |
| static constexpr bool is_applicable_property_v = |
| is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>; |
| |
| /// The blocking_adaptation_t::allowed_t property can be required. |
| static constexpr bool is_requirable = true; |
| |
| /// The blocking_adaptation_t::allowed_t property can be preferred. |
| static constexpr bool is_preferable = false; |
| |
| /// The type returned by queries against an @c any_executor. |
| typedef blocking_adaptation_t polymorphic_query_result_type; |
| |
| /// Default constructor. |
| constexpr allowed_t(); |
| |
| /// Get the value associated with a property object. |
| /** |
| * @returns allowed_t(); |
| */ |
| static constexpr blocking_adaptation_t value(); |
| }; |
| |
| /// A special value used for accessing the blocking_adaptation_t::disallowed_t |
| /// property. |
| static constexpr disallowed_t disallowed; |
| |
| /// A special value used for accessing the blocking_adaptation_t::allowed_t |
| /// property. |
| static constexpr allowed_t allowed; |
| |
| /// Default constructor. |
| constexpr blocking_adaptation_t(); |
| |
| /// Construct from a sub-property value. |
| constexpr blocking_adaptation_t(disallowed_t); |
| |
| /// Construct from a sub-property value. |
| constexpr blocking_adaptation_t(allowed_t); |
| |
| /// Compare property values for equality. |
| friend constexpr bool operator==( |
| const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept; |
| |
| /// Compare property values for inequality. |
| friend constexpr bool operator!=( |
| const blocking_adaptation_t& a, const blocking_adaptation_t& b) noexcept; |
| }; |
| |
| /// A special value used for accessing the blocking_adaptation_t property. |
| constexpr blocking_adaptation_t blocking_adaptation; |
| |
| } // namespace execution |
| |
| #else // defined(GENERATING_DOCUMENTATION) |
| |
| namespace execution { |
| namespace detail { |
| namespace blocking_adaptation { |
| |
| template <int I> struct disallowed_t; |
| template <int I> struct allowed_t; |
| |
| } // namespace blocking_adaptation |
| |
| template <int I = 0> |
| struct blocking_adaptation_t |
| { |
| #if defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| ASIO_STATIC_CONSTEXPR(bool, |
| is_applicable_property_v = ( |
| is_executor<T>::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_sender<T> |
| >::type::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_scheduler<T> |
| >::type::value)); |
| #endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| ASIO_STATIC_CONSTEXPR(bool, is_requirable = false); |
| ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); |
| typedef blocking_adaptation_t polymorphic_query_result_type; |
| |
| typedef detail::blocking_adaptation::disallowed_t<I> disallowed_t; |
| typedef detail::blocking_adaptation::allowed_t<I> allowed_t; |
| |
| ASIO_CONSTEXPR blocking_adaptation_t() |
| : value_(-1) |
| { |
| } |
| |
| ASIO_CONSTEXPR blocking_adaptation_t(disallowed_t) |
| : value_(0) |
| { |
| } |
| |
| ASIO_CONSTEXPR blocking_adaptation_t(allowed_t) |
| : value_(1) |
| { |
| } |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static ASIO_CONSTEXPR |
| typename traits::query_static_constexpr_member< |
| T, blocking_adaptation_t>::result_type |
| static_query() |
| ASIO_NOEXCEPT_IF(( |
| traits::query_static_constexpr_member< |
| T, blocking_adaptation_t |
| >::is_noexcept)) |
| { |
| return traits::query_static_constexpr_member< |
| T, blocking_adaptation_t>::value(); |
| } |
| |
| template <typename T> |
| static ASIO_CONSTEXPR |
| typename traits::static_query<T, disallowed_t>::result_type |
| static_query( |
| typename enable_if< |
| !traits::query_static_constexpr_member< |
| T, blocking_adaptation_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::query_member<T, blocking_adaptation_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| traits::static_query<T, disallowed_t>::is_valid |
| >::type* = 0) ASIO_NOEXCEPT |
| { |
| return traits::static_query<T, disallowed_t>::value(); |
| } |
| |
| template <typename T> |
| static ASIO_CONSTEXPR |
| typename traits::static_query<T, allowed_t>::result_type |
| static_query( |
| typename enable_if< |
| !traits::query_static_constexpr_member< |
| T, blocking_adaptation_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::query_member<T, blocking_adaptation_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::static_query<T, disallowed_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| traits::static_query<T, allowed_t>::is_valid |
| >::type* = 0) ASIO_NOEXCEPT |
| { |
| return traits::static_query<T, allowed_t>::value(); |
| } |
| |
| template <typename E, |
| typename T = decltype(blocking_adaptation_t::static_query<E>())> |
| static ASIO_CONSTEXPR const T static_query_v |
| = blocking_adaptation_t::static_query<E>(); |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| friend ASIO_CONSTEXPR bool operator==( |
| const blocking_adaptation_t& a, const blocking_adaptation_t& b) |
| { |
| return a.value_ == b.value_; |
| } |
| |
| friend ASIO_CONSTEXPR bool operator!=( |
| const blocking_adaptation_t& a, const blocking_adaptation_t& b) |
| { |
| return a.value_ != b.value_; |
| } |
| |
| struct convertible_from_blocking_adaptation_t |
| { |
| ASIO_CONSTEXPR convertible_from_blocking_adaptation_t( |
| blocking_adaptation_t) |
| { |
| } |
| }; |
| |
| template <typename Executor> |
| friend ASIO_CONSTEXPR blocking_adaptation_t query( |
| const Executor& ex, convertible_from_blocking_adaptation_t, |
| typename enable_if< |
| can_query<const Executor&, disallowed_t>::value |
| >::type* = 0) |
| #if !defined(__clang__) // Clang crashes if noexcept is used here. |
| #if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified. |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, |
| blocking_adaptation_t<>::disallowed_t>::value)) |
| #else // defined(ASIO_MSVC) |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, disallowed_t>::value)) |
| #endif // defined(ASIO_MSVC) |
| #endif // !defined(__clang__) |
| { |
| return asio::query(ex, disallowed_t()); |
| } |
| |
| template <typename Executor> |
| friend ASIO_CONSTEXPR blocking_adaptation_t query( |
| const Executor& ex, convertible_from_blocking_adaptation_t, |
| typename enable_if< |
| !can_query<const Executor&, disallowed_t>::value |
| >::type* = 0, |
| typename enable_if< |
| can_query<const Executor&, allowed_t>::value |
| >::type* = 0) |
| #if !defined(__clang__) // Clang crashes if noexcept is used here. |
| #if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified. |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, |
| blocking_adaptation_t<>::allowed_t>::value)) |
| #else // defined(ASIO_MSVC) |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, allowed_t>::value)) |
| #endif // defined(ASIO_MSVC) |
| #endif // !defined(__clang__) |
| { |
| return asio::query(ex, allowed_t()); |
| } |
| |
| ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(disallowed_t, disallowed); |
| ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(allowed_t, allowed); |
| |
| #if !defined(ASIO_HAS_CONSTEXPR) |
| static const blocking_adaptation_t instance; |
| #endif // !defined(ASIO_HAS_CONSTEXPR) |
| |
| private: |
| int value_; |
| }; |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T blocking_adaptation_t<I>::static_query_v; |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| #if !defined(ASIO_HAS_CONSTEXPR) |
| template <int I> |
| const blocking_adaptation_t<I> blocking_adaptation_t<I>::instance; |
| #endif |
| |
| template <int I> |
| const typename blocking_adaptation_t<I>::disallowed_t |
| blocking_adaptation_t<I>::disallowed; |
| |
| template <int I> |
| const typename blocking_adaptation_t<I>::allowed_t |
| blocking_adaptation_t<I>::allowed; |
| |
| namespace blocking_adaptation { |
| |
| template <int I = 0> |
| struct disallowed_t |
| { |
| #if defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| ASIO_STATIC_CONSTEXPR(bool, |
| is_applicable_property_v = ( |
| is_executor<T>::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_sender<T> |
| >::type::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_scheduler<T> |
| >::type::value)); |
| #endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_preferable = true); |
| typedef blocking_adaptation_t<I> polymorphic_query_result_type; |
| |
| ASIO_CONSTEXPR disallowed_t() |
| { |
| } |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static ASIO_CONSTEXPR |
| typename traits::query_static_constexpr_member<T, disallowed_t>::result_type |
| static_query() |
| ASIO_NOEXCEPT_IF(( |
| traits::query_static_constexpr_member<T, disallowed_t>::is_noexcept)) |
| { |
| return traits::query_static_constexpr_member<T, disallowed_t>::value(); |
| } |
| |
| template <typename T> |
| static ASIO_CONSTEXPR disallowed_t static_query( |
| typename enable_if< |
| !traits::query_static_constexpr_member<T, disallowed_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::query_member<T, disallowed_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !traits::query_free<T, disallowed_t>::is_valid |
| >::type* = 0, |
| typename enable_if< |
| !can_query<T, allowed_t<I> >::value |
| >::type* = 0) ASIO_NOEXCEPT |
| { |
| return disallowed_t(); |
| } |
| |
| template <typename E, typename T = decltype(disallowed_t::static_query<E>())> |
| static ASIO_CONSTEXPR const T static_query_v |
| = disallowed_t::static_query<E>(); |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| static ASIO_CONSTEXPR blocking_adaptation_t<I> value() |
| { |
| return disallowed_t(); |
| } |
| |
| friend ASIO_CONSTEXPR bool operator==( |
| const disallowed_t&, const disallowed_t&) |
| { |
| return true; |
| } |
| |
| friend ASIO_CONSTEXPR bool operator!=( |
| const disallowed_t&, const disallowed_t&) |
| { |
| return false; |
| } |
| }; |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T disallowed_t<I>::static_query_v; |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| template <typename Executor> |
| class adapter |
| { |
| public: |
| adapter(int, const Executor& e) ASIO_NOEXCEPT |
| : executor_(e) |
| { |
| } |
| |
| adapter(const adapter& other) ASIO_NOEXCEPT |
| : executor_(other.executor_) |
| { |
| } |
| |
| #if defined(ASIO_HAS_MOVE) |
| adapter(adapter&& other) ASIO_NOEXCEPT |
| : executor_(ASIO_MOVE_CAST(Executor)(other.executor_)) |
| { |
| } |
| #endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) |
| |
| template <int I> |
| static ASIO_CONSTEXPR allowed_t<I> query( |
| blocking_adaptation_t<I>) ASIO_NOEXCEPT |
| { |
| return allowed_t<I>(); |
| } |
| |
| template <int I> |
| static ASIO_CONSTEXPR allowed_t<I> query( |
| allowed_t<I>) ASIO_NOEXCEPT |
| { |
| return allowed_t<I>(); |
| } |
| |
| template <int I> |
| static ASIO_CONSTEXPR allowed_t<I> query( |
| disallowed_t<I>) ASIO_NOEXCEPT |
| { |
| return allowed_t<I>(); |
| } |
| |
| template <typename Property> |
| typename enable_if< |
| can_query<const Executor&, Property>::value, |
| typename query_result<const Executor&, Property>::type |
| >::type query(const Property& p) const |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_query<const Executor&, Property>::value)) |
| { |
| return asio::query(executor_, p); |
| } |
| |
| template <int I> |
| Executor require(disallowed_t<I>) const ASIO_NOEXCEPT |
| { |
| return executor_; |
| } |
| |
| template <typename Property> |
| typename enable_if< |
| can_require<const Executor&, Property>::value, |
| adapter<typename decay< |
| typename require_result<const Executor&, Property>::type |
| >::type> |
| >::type require(const Property& p) const |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_require<const Executor&, Property>::value)) |
| { |
| return adapter<typename decay< |
| typename require_result<const Executor&, Property>::type |
| >::type>(0, asio::require(executor_, p)); |
| } |
| |
| template <typename Property> |
| typename enable_if< |
| can_prefer<const Executor&, Property>::value, |
| adapter<typename decay< |
| typename prefer_result<const Executor&, Property>::type |
| >::type> |
| >::type prefer(const Property& p) const |
| ASIO_NOEXCEPT_IF(( |
| is_nothrow_prefer<const Executor&, Property>::value)) |
| { |
| return adapter<typename decay< |
| typename prefer_result<const Executor&, Property>::type |
| >::type>(0, asio::prefer(executor_, p)); |
| } |
| |
| template <typename Function> |
| typename enable_if< |
| execution::can_execute<const Executor&, Function>::value |
| >::type execute(ASIO_MOVE_ARG(Function) f) const |
| { |
| execution::execute(executor_, ASIO_MOVE_CAST(Function)(f)); |
| } |
| |
| friend bool operator==(const adapter& a, const adapter& b) ASIO_NOEXCEPT |
| { |
| return a.executor_ == b.executor_; |
| } |
| |
| friend bool operator!=(const adapter& a, const adapter& b) ASIO_NOEXCEPT |
| { |
| return a.executor_ != b.executor_; |
| } |
| |
| private: |
| Executor executor_; |
| }; |
| |
| template <int I = 0> |
| struct allowed_t |
| { |
| #if defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| template <typename T> |
| ASIO_STATIC_CONSTEXPR(bool, |
| is_applicable_property_v = ( |
| is_executor<T>::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_sender<T> |
| >::type::value |
| || conditional< |
| is_executor<T>::value, |
| false_type, |
| is_scheduler<T> |
| >::type::value)); |
| #endif // defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| ASIO_STATIC_CONSTEXPR(bool, is_requirable = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_preferable = false); |
| typedef blocking_adaptation_t<I> polymorphic_query_result_type; |
| |
| ASIO_CONSTEXPR allowed_t() |
| { |
| } |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <typename T> |
| static ASIO_CONSTEXPR |
| typename traits::query_static_constexpr_member<T, allowed_t>::result_type |
| static_query() |
| ASIO_NOEXCEPT_IF(( |
| traits::query_static_constexpr_member<T, allowed_t>::is_noexcept)) |
| { |
| return traits::query_static_constexpr_member<T, allowed_t>::value(); |
| } |
| |
| template <typename E, typename T = decltype(allowed_t::static_query<E>())> |
| static ASIO_CONSTEXPR const T static_query_v |
| = allowed_t::static_query<E>(); |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| static ASIO_CONSTEXPR blocking_adaptation_t<I> value() |
| { |
| return allowed_t(); |
| } |
| |
| friend ASIO_CONSTEXPR bool operator==( |
| const allowed_t&, const allowed_t&) |
| { |
| return true; |
| } |
| |
| friend ASIO_CONSTEXPR bool operator!=( |
| const allowed_t&, const allowed_t&) |
| { |
| return false; |
| } |
| |
| template <typename Executor> |
| friend adapter<Executor> require( |
| const Executor& e, const allowed_t&, |
| typename enable_if< |
| is_executor<Executor>::value |
| >::type* = 0) |
| { |
| return adapter<Executor>(0, e); |
| } |
| }; |
| |
| #if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| template <int I> template <typename E, typename T> |
| const T allowed_t<I>::static_query_v; |
| #endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| template <typename Function> |
| class blocking_execute_state |
| { |
| public: |
| template <typename F> |
| blocking_execute_state(ASIO_MOVE_ARG(F) f) |
| : func_(ASIO_MOVE_CAST(F)(f)), |
| is_complete_(false) |
| { |
| } |
| |
| template <typename Executor> |
| void execute_and_wait(ASIO_MOVE_ARG(Executor) ex) |
| { |
| handler h = { this }; |
| execution::execute(ASIO_MOVE_CAST(Executor)(ex), h); |
| asio::detail::mutex::scoped_lock lock(mutex_); |
| while (!is_complete_) |
| event_.wait(lock); |
| } |
| |
| struct cleanup |
| { |
| ~cleanup() |
| { |
| asio::detail::mutex::scoped_lock lock(state_->mutex_); |
| state_->is_complete_ = true; |
| state_->event_.unlock_and_signal_one_for_destruction(lock); |
| } |
| |
| blocking_execute_state* state_; |
| }; |
| |
| struct handler |
| { |
| void operator()() |
| { |
| cleanup c = { state_ }; |
| state_->func_(); |
| } |
| |
| blocking_execute_state* state_; |
| }; |
| |
| Function func_; |
| asio::detail::mutex mutex_; |
| asio::detail::event event_; |
| bool is_complete_; |
| }; |
| |
| template <typename Executor, typename Function> |
| void blocking_execute( |
| ASIO_MOVE_ARG(Executor) ex, |
| ASIO_MOVE_ARG(Function) func) |
| { |
| typedef typename decay<Function>::type func_t; |
| blocking_execute_state<func_t> state(ASIO_MOVE_CAST(Function)(func)); |
| state.execute_and_wait(ex); |
| } |
| |
| } // namespace blocking_adaptation |
| } // namespace detail |
| |
| typedef detail::blocking_adaptation_t<> blocking_adaptation_t; |
| |
| #if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) |
| constexpr blocking_adaptation_t blocking_adaptation; |
| #else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION) |
| namespace { static const blocking_adaptation_t& |
| blocking_adaptation = blocking_adaptation_t::instance; } |
| #endif |
| |
| } // namespace execution |
| |
| #if !defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| template <typename T> |
| struct is_applicable_property<T, execution::blocking_adaptation_t> |
| : integral_constant<bool, |
| execution::is_executor<T>::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_sender<T> |
| >::type::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_scheduler<T> |
| >::type::value> |
| { |
| }; |
| |
| template <typename T> |
| struct is_applicable_property<T, execution::blocking_adaptation_t::disallowed_t> |
| : integral_constant<bool, |
| execution::is_executor<T>::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_sender<T> |
| >::type::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_scheduler<T> |
| >::type::value> |
| { |
| }; |
| |
| template <typename T> |
| struct is_applicable_property<T, execution::blocking_adaptation_t::allowed_t> |
| : integral_constant<bool, |
| execution::is_executor<T>::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_sender<T> |
| >::type::value |
| || conditional< |
| execution::is_executor<T>::value, |
| false_type, |
| execution::is_scheduler<T> |
| >::type::value> |
| { |
| }; |
| |
| #endif // !defined(ASIO_HAS_VARIABLE_TEMPLATES) |
| |
| namespace traits { |
| |
| #if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) |
| |
| template <typename T> |
| struct query_free_default<T, execution::blocking_adaptation_t, |
| typename enable_if< |
| can_query<T, execution::blocking_adaptation_t::disallowed_t>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = (is_nothrow_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::value)); |
| |
| typedef execution::blocking_adaptation_t result_type; |
| }; |
| |
| template <typename T> |
| struct query_free_default<T, execution::blocking_adaptation_t, |
| typename enable_if< |
| !can_query<T, execution::blocking_adaptation_t::disallowed_t>::value |
| && can_query<T, execution::blocking_adaptation_t::allowed_t>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = |
| (is_nothrow_query<T, execution::blocking_adaptation_t::allowed_t>::value)); |
| |
| typedef execution::blocking_adaptation_t result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \ |
| || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t, |
| typename enable_if< |
| traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t>::result_type result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t>::value(); |
| } |
| }; |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t, |
| typename enable_if< |
| !traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t>::is_valid |
| && !traits::query_member<T, |
| execution::blocking_adaptation_t>::is_valid |
| && traits::static_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::static_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::result_type result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return traits::static_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::value(); |
| } |
| }; |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t, |
| typename enable_if< |
| !traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t>::is_valid |
| && !traits::query_member<T, |
| execution::blocking_adaptation_t>::is_valid |
| && !traits::static_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| && traits::static_query<T, |
| execution::blocking_adaptation_t::allowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::static_query<T, |
| execution::blocking_adaptation_t::allowed_t>::result_type result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return traits::static_query<T, |
| execution::blocking_adaptation_t::allowed_t>::value(); |
| } |
| }; |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t::disallowed_t, |
| typename enable_if< |
| traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::disallowed_t>::result_type result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::disallowed_t>::value(); |
| } |
| }; |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t::disallowed_t, |
| typename enable_if< |
| !traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| && !traits::query_member<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| && !traits::query_free<T, |
| execution::blocking_adaptation_t::disallowed_t>::is_valid |
| && !can_query<T, execution::blocking_adaptation_t::allowed_t>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef execution::blocking_adaptation_t::disallowed_t result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return result_type(); |
| } |
| }; |
| |
| template <typename T> |
| struct static_query<T, execution::blocking_adaptation_t::allowed_t, |
| typename enable_if< |
| traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::allowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| |
| typedef typename traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::allowed_t>::result_type result_type; |
| |
| static ASIO_CONSTEXPR result_type value() |
| { |
| return traits::query_static_constexpr_member<T, |
| execution::blocking_adaptation_t::allowed_t>::value(); |
| } |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) |
| // || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES) |
| |
| #if !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) |
| |
| template <typename T> |
| struct static_require<T, execution::blocking_adaptation_t::disallowed_t, |
| typename enable_if< |
| static_query<T, execution::blocking_adaptation_t::disallowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = |
| (is_same<typename static_query<T, |
| execution::blocking_adaptation_t::disallowed_t>::result_type, |
| execution::blocking_adaptation_t::disallowed_t>::value)); |
| }; |
| |
| template <typename T> |
| struct static_require<T, execution::blocking_adaptation_t::allowed_t, |
| typename enable_if< |
| static_query<T, execution::blocking_adaptation_t::allowed_t>::is_valid |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = |
| (is_same<typename static_query<T, |
| execution::blocking_adaptation_t::allowed_t>::result_type, |
| execution::blocking_adaptation_t::allowed_t>::value)); |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) |
| |
| template <typename T> |
| struct require_free_default<T, execution::blocking_adaptation_t::allowed_t, |
| typename enable_if< |
| is_same<T, typename decay<T>::type>::value |
| && execution::is_executor<T>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); |
| typedef execution::detail::blocking_adaptation::adapter<T> result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_FREE_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) |
| |
| template <typename Executor> |
| struct equality_comparable< |
| execution::detail::blocking_adaptation::adapter<Executor> > |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) |
| |
| template <typename Executor, typename Function> |
| struct execute_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, Function> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false); |
| typedef void result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) |
| |
| template <typename Executor, int I> |
| struct query_static_constexpr_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, |
| execution::detail::blocking_adaptation_t<I> > |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| typedef execution::blocking_adaptation_t::allowed_t result_type; |
| |
| static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT |
| { |
| return result_type(); |
| } |
| }; |
| |
| template <typename Executor, int I> |
| struct query_static_constexpr_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, |
| execution::detail::blocking_adaptation::allowed_t<I> > |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| typedef execution::blocking_adaptation_t::allowed_t result_type; |
| |
| static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT |
| { |
| return result_type(); |
| } |
| }; |
| |
| template <typename Executor, int I> |
| struct query_static_constexpr_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, |
| execution::detail::blocking_adaptation::disallowed_t<I> > |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| typedef execution::blocking_adaptation_t::allowed_t result_type; |
| |
| static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT |
| { |
| return result_type(); |
| } |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) |
| |
| template <typename Executor, typename Property> |
| struct query_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, Property, |
| typename enable_if< |
| can_query<const Executor&, Property>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = |
| (is_nothrow_query<Executor, Property>::value)); |
| typedef typename query_result<Executor, Property>::type result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) |
| |
| template <typename Executor, int I> |
| struct require_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, |
| execution::detail::blocking_adaptation::disallowed_t<I> > |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true); |
| typedef Executor result_type; |
| }; |
| |
| template <typename Executor, typename Property> |
| struct require_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, Property, |
| typename enable_if< |
| can_require<const Executor&, Property>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = |
| (is_nothrow_require<Executor, Property>::value)); |
| typedef execution::detail::blocking_adaptation::adapter<typename decay< |
| typename require_result<Executor, Property>::type |
| >::type> result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT) |
| |
| #if !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) |
| |
| template <typename Executor, typename Property> |
| struct prefer_member< |
| execution::detail::blocking_adaptation::adapter<Executor>, Property, |
| typename enable_if< |
| can_prefer<const Executor&, Property>::value |
| >::type> |
| { |
| ASIO_STATIC_CONSTEXPR(bool, is_valid = true); |
| ASIO_STATIC_CONSTEXPR(bool, is_noexcept = |
| (is_nothrow_prefer<Executor, Property>::value)); |
| typedef execution::detail::blocking_adaptation::adapter<typename decay< |
| typename prefer_result<Executor, Property>::type |
| >::type> result_type; |
| }; |
| |
| #endif // !defined(ASIO_HAS_DEDUCED_PREFER_MEMBER_TRAIT) |
| |
| } // namespace traits |
| |
| #endif // defined(GENERATING_DOCUMENTATION) |
| |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_EXECUTION_BLOCKING_ADAPTATION_HPP |
