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Implement P2300 get_scheduler bridge for executors #7238
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176 changes: 176 additions & 0 deletions
176
libs/core/executors/include/hpx/executors/executor_scheduler.hpp
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,176 @@ | ||
| // Copyright (c) 2007-2025 Hartmut Kaiser | ||
| // Copyright (c) 2026 The STE||AR-Group | ||
| // | ||
| // SPDX-License-Identifier: BSL-1.0 | ||
| // 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) | ||
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| /// \file parallel/executors/executor_scheduler.hpp | ||
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| #pragma once | ||
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| #include <hpx/config.hpp> | ||
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| #include <hpx/modules/errors.hpp> | ||
| #include <hpx/modules/execution.hpp> | ||
| #include <hpx/modules/execution_base.hpp> | ||
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| #include <exception> | ||
| #include <type_traits> | ||
| #include <utility> | ||
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| namespace hpx::execution::experimental { | ||
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| // Forward declaration | ||
| template <typename Executor> | ||
| struct executor_scheduler; | ||
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| namespace detail { | ||
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| /////////////////////////////////////////////////////////////////////// | ||
| template <typename Executor, typename Receiver> | ||
| struct executor_operation_state | ||
| { | ||
| HPX_NO_UNIQUE_ADDRESS std::decay_t<Executor> exec_; | ||
| HPX_NO_UNIQUE_ADDRESS std::decay_t<Receiver> receiver_; | ||
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| template <typename Exec, typename Recv> | ||
| executor_operation_state(Exec&& exec, Recv&& recv) | ||
| : exec_(HPX_FORWARD(Exec, exec)) | ||
| , receiver_(HPX_FORWARD(Recv, recv)) | ||
| { | ||
| } | ||
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| executor_operation_state(executor_operation_state&&) = delete; | ||
| executor_operation_state(executor_operation_state const&) = delete; | ||
| executor_operation_state& operator=( | ||
| executor_operation_state&&) = delete; | ||
| executor_operation_state& operator=( | ||
| executor_operation_state const&) = delete; | ||
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| ~executor_operation_state() = default; | ||
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| void start() & noexcept | ||
| { | ||
| hpx::detail::try_catch_exception_ptr( | ||
| [&]() { | ||
| if constexpr ( | ||
| std::is_same_v< | ||
| hpx::traits::executor_execution_category_t< | ||
| std::decay_t<Executor>>, | ||
| hpx::execution::sequenced_execution_tag>) | ||
| { | ||
| // For sequenced executors, invoke inline | ||
| hpx::execution::experimental::set_value( | ||
| HPX_MOVE(receiver_)); | ||
| } | ||
| else | ||
| { | ||
| hpx::parallel::execution::post(exec_, | ||
| [receiver = HPX_MOVE(receiver_)]() mutable { | ||
| hpx::execution::experimental::set_value( | ||
| HPX_MOVE(receiver)); | ||
| }); | ||
| } | ||
| }, | ||
| [&](std::exception_ptr ep) { | ||
| hpx::execution::experimental::set_error( | ||
| HPX_MOVE(receiver_), HPX_MOVE(ep)); | ||
| }); | ||
| } | ||
| }; | ||
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| /////////////////////////////////////////////////////////////////////// | ||
| template <typename Executor> | ||
| struct executor_sender | ||
| { | ||
| using sender_concept = hpx::execution::experimental::sender_t; | ||
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| HPX_NO_UNIQUE_ADDRESS std::decay_t<Executor> exec_; | ||
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| using completion_signatures = | ||
| hpx::execution::experimental::completion_signatures< | ||
| hpx::execution::experimental::set_value_t(), | ||
| hpx::execution::experimental::set_error_t( | ||
| std::exception_ptr)>; | ||
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| template <typename Self, typename... Env> | ||
| static consteval auto get_completion_signatures() noexcept | ||
| -> completion_signatures | ||
| { | ||
| return {}; | ||
| } | ||
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| constexpr auto get_env() const noexcept | ||
| { | ||
| struct env | ||
| { | ||
| std::decay_t<Executor> const& exec_; | ||
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| constexpr auto query(hpx::execution::experimental:: | ||
| get_completion_scheduler_t< | ||
| hpx::execution::experimental::set_value_t>) | ||
| const noexcept | ||
| { | ||
| return executor_scheduler<Executor>{exec_}; | ||
| } | ||
| }; | ||
| return env{exec_}; | ||
| } | ||
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| template <typename Receiver> | ||
| auto connect(Receiver&& receiver) && | ||
| { | ||
| return executor_operation_state<Executor, | ||
| std::decay_t<Receiver>>{ | ||
| HPX_MOVE(exec_), HPX_FORWARD(Receiver, receiver)}; | ||
| } | ||
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| template <typename Receiver> | ||
| auto connect(Receiver&& receiver) const& | ||
| { | ||
| return executor_operation_state<Executor, | ||
| std::decay_t<Receiver>>{ | ||
| exec_, HPX_FORWARD(Receiver, receiver)}; | ||
| } | ||
| }; | ||
| } // namespace detail | ||
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| /////////////////////////////////////////////////////////////////////////// | ||
| template <typename Executor> | ||
| struct executor_scheduler | ||
| { | ||
| using executor_type = std::decay_t<Executor>; | ||
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| HPX_NO_UNIQUE_ADDRESS executor_type exec_; | ||
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| constexpr executor_scheduler() = default; | ||
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| template <typename Exec> | ||
| requires(!std::is_same_v<std::decay_t<Exec>, executor_scheduler>) | ||
| constexpr explicit executor_scheduler(Exec&& exec) noexcept | ||
| : exec_(HPX_FORWARD(Exec, exec)) | ||
| { | ||
| } | ||
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| constexpr bool operator==(executor_scheduler const& rhs) const noexcept | ||
| { | ||
| return exec_ == rhs.exec_; | ||
| } | ||
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| constexpr bool operator!=(executor_scheduler const& rhs) const noexcept | ||
| { | ||
| return !(*this == rhs); | ||
| } | ||
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| constexpr detail::executor_sender<Executor> schedule() const& noexcept | ||
| { | ||
| return {exec_}; | ||
| } | ||
|
hkaiser marked this conversation as resolved.
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| constexpr detail::executor_sender<Executor> schedule() && noexcept | ||
| { | ||
| return {HPX_MOVE(exec_)}; | ||
| } | ||
| }; | ||
| } // namespace hpx::execution::experimental | ||
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