include/boost/corosio/native/detail/uring/uring_descriptor_service.hpp
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boost::corosio::detail::uring_descriptor_service::uring_descriptor_service(boost::capy::execution_context&)
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boost::corosio::detail::uring_descriptor_service::assign_descriptor(boost::corosio::posix_stream_descriptor::implementation&, int)
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| Line | TLA | Hits | Source Code |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2026 Michael Vandeberg | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/cppalliance/corosio | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_COROSIO_NATIVE_DETAIL_URING_URING_DESCRIPTOR_SERVICE_HPP | ||
| 11 | #define BOOST_COROSIO_NATIVE_DETAIL_URING_URING_DESCRIPTOR_SERVICE_HPP | ||
| 12 | |||
| 13 | #include <boost/corosio/detail/platform.hpp> | ||
| 14 | |||
| 15 | #if BOOST_COROSIO_HAS_URING | ||
| 16 | |||
| 17 | #include <boost/corosio/detail/descriptor_service.hpp> | ||
| 18 | #include <boost/corosio/native/detail/uring/uring_descriptor.hpp> | ||
| 19 | #include <boost/corosio/native/detail/uring/uring_file_service_base.hpp> | ||
| 20 | #include <boost/corosio/native/detail/uring/uring_scheduler.hpp> | ||
| 21 | #include <boost/corosio/native/detail/validate_fd.hpp> | ||
| 22 | #include <boost/capy/ex/execution_context.hpp> | ||
| 23 | |||
| 24 | #include <system_error> | ||
| 25 | |||
| 26 | /* io_uring-backed descriptor_service. | ||
| 27 | |||
| 28 | assign_descriptor is the reactor version minus the registration | ||
| 29 | step: io_uring has no adopt-time registration syscall, so adoption | ||
| 30 | cannot fail once validation has passed, and a kernel refusal | ||
| 31 | surfaces at the first operation instead. It does probe whether the | ||
| 32 | kernel can poll the fd, which the reactors learn from registration. | ||
| 33 | |||
| 34 | Lifecycle comes from uring_file_service_base, as asio's file service | ||
| 35 | reuses its descriptor service. | ||
| 36 | */ | ||
| 37 | |||
| 38 | namespace boost::corosio::detail { | ||
| 39 | |||
| 40 | /// Native io_uring descriptor service. Owns every @ref uring_descriptor | ||
| 41 | /// the context creates. | ||
| 42 | class BOOST_COROSIO_DECL uring_descriptor_service final | ||
| 43 | : public uring_file_service_base< | ||
| 44 | uring_descriptor_service, | ||
| 45 | descriptor_service, | ||
| 46 | uring_descriptor> | ||
| 47 | { | ||
| 48 | using base_service = uring_file_service_base< | ||
| 49 | uring_descriptor_service, | ||
| 50 | descriptor_service, | ||
| 51 | uring_descriptor>; | ||
| 52 | |||
| 53 | public: | ||
| 54 | 53x | explicit uring_descriptor_service(capy::execution_context& ctx) | |
| 55 | 53x | : base_service(ctx.use_service<uring_scheduler>()) | |
| 56 | { | ||
| 57 | 53x | } | |
| 58 | |||
| 59 | 54x | std::error_code assign_descriptor( | |
| 60 | posix_stream_descriptor::implementation& impl_base, | ||
| 61 | native_handle_type fd) override | ||
| 62 | { | ||
| 63 | 54x | auto* impl = static_cast<uring_descriptor*>(&impl_base); | |
| 64 | |||
| 65 | // The public assign() guarantees the object is closed. | ||
| 66 | 54x | if (auto ec = validate_descriptor_fd(fd)) | |
| 67 | 2x | return ec; | |
| 68 | |||
| 69 | 52x | impl->set_descriptor(fd, fd_is_pollable(fd)); | |
| 70 | 52x | return {}; | |
| 71 | } | ||
| 72 | }; | ||
| 73 | |||
| 74 | } // namespace boost::corosio::detail | ||
| 75 | |||
| 76 | #endif // BOOST_COROSIO_HAS_URING | ||
| 77 | |||
| 78 | #endif // BOOST_COROSIO_NATIVE_DETAIL_URING_URING_DESCRIPTOR_SERVICE_HPP | ||
| 79 |