. /include/boost/corosio /native /native_random_access_file.hpp
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1   // 1   //
2   // Copyright (c) 2026 Steve Gerbino 2   // Copyright (c) 2026 Steve Gerbino
3   // Copyright (c) 2026 Michael Vandeberg 3   // Copyright (c) 2026 Michael Vandeberg
4   // 4   //
5   // Distributed under the Boost Software License, Version 1.0. (See accompanying 5   // Distributed under the Boost Software License, Version 1.0. (See accompanying
6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7   // 7   //
8   // Official repository: https://github.com/cppalliance/corosio 8   // Official repository: https://github.com/cppalliance/corosio
9   // 9   //
10   10  
11   #ifndef BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP 11   #ifndef BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP
12   #define BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP 12   #define BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP
13   13  
14   #include <boost/corosio/random_access_file.hpp> 14   #include <boost/corosio/random_access_file.hpp>
15   #include <boost/corosio/backend.hpp> 15   #include <boost/corosio/backend.hpp>
16   #include <boost/corosio/detail/op_base.hpp> 16   #include <boost/corosio/detail/op_base.hpp>
17   17  
18   #ifndef BOOST_COROSIO_MRDOCS 18   #ifndef BOOST_COROSIO_MRDOCS
19   #if BOOST_COROSIO_HAS_EPOLL || BOOST_COROSIO_HAS_SELECT || \ 19   #if BOOST_COROSIO_HAS_EPOLL || BOOST_COROSIO_HAS_SELECT || \
20   BOOST_COROSIO_HAS_KQUEUE 20   BOOST_COROSIO_HAS_KQUEUE
21   #include <boost/corosio/native/detail/posix/posix_random_access_file_service.hpp> 21   #include <boost/corosio/native/detail/posix/posix_random_access_file_service.hpp>
22   #endif 22   #endif
23   23  
24   #if BOOST_COROSIO_HAS_URING 24   #if BOOST_COROSIO_HAS_URING
25   #include <boost/corosio/native/detail/uring/uring_random_access_file.hpp> 25   #include <boost/corosio/native/detail/uring/uring_random_access_file.hpp>
26   #endif 26   #endif
27   27  
28   #if BOOST_COROSIO_HAS_IOCP 28   #if BOOST_COROSIO_HAS_IOCP
29   #include <boost/corosio/native/detail/iocp/win_random_access_file_service.hpp> 29   #include <boost/corosio/native/detail/iocp/win_random_access_file_service.hpp>
30   #endif 30   #endif
31   #endif // !BOOST_COROSIO_MRDOCS 31   #endif // !BOOST_COROSIO_MRDOCS
32   32  
33   namespace boost::corosio { 33   namespace boost::corosio {
34   34  
35   /** Reads and writes a file at arbitrary offsets, calling the backend directly. 35   /** Reads and writes a file at arbitrary offsets, calling the backend directly.
36   36  
37   This class template inherits from @ref random_access_file. It 37   This class template inherits from @ref random_access_file. It
38   shadows `read_some_at` / `write_some_at` with versions that call the 38   shadows `read_some_at` / `write_some_at` with versions that call the
39   backend implementation directly. The compiler can then inline 39   backend implementation directly. The compiler can then inline
40   through the entire call chain. 40   through the entire call chain.
41   41  
42   Non-async operations (`open`, `close`, `size`, `resize`, 42   Non-async operations (`open`, `close`, `size`, `resize`,
43   `sync_data`, `sync_all`) remain unchanged and dispatch through 43   `sync_data`, `sync_all`) remain unchanged and dispatch through
44   the compiled library. 44   the compiled library.
45   45  
46   A `native_random_access_file` IS-A `random_access_file` and 46   A `native_random_access_file` IS-A `random_access_file` and
47   can be passed to any function expecting `random_access_file&`, 47   can be passed to any function expecting `random_access_file&`,
48   in which case virtual dispatch is used transparently. 48   in which case virtual dispatch is used transparently.
49   49  
50   @note On POSIX platforms, file I/O is dispatched to a thread pool 50   @note On POSIX platforms, file I/O is dispatched to a thread pool
51   regardless of the chosen reactor backend. All three reactor tags 51   regardless of the chosen reactor backend. All three reactor tags
52   (`epoll`, `select`, `kqueue`) therefore resolve to the same 52   (`epoll`, `select`, `kqueue`) therefore resolve to the same
53   underlying implementation. The `Backend` template parameter 53   underlying implementation. The `Backend` template parameter
54   exists for API symmetry with @ref native_tcp_socket and friends. 54   exists for API symmetry with @ref native_tcp_socket and friends.
55   The vtable savings are smaller relative to the thread-pool / 55   The vtable savings are smaller relative to the thread-pool /
56   overlapped-I/O cost than they are for socket operations. 56   overlapped-I/O cost than they are for socket operations.
57   57  
58   @tparam Backend A backend tag value (e.g., `epoll`, `iocp`). 58   @tparam Backend A backend tag value (e.g., `epoll`, `iocp`).
59   59  
60   @par Thread Safety 60   @par Thread Safety
61   Same as @ref random_access_file. 61   Same as @ref random_access_file.
62   62  
63   @par Example 63   @par Example
64   @par !example native_random_access_file 64   @par !example native_random_access_file
65   65  
66   @see random_access_file, epoll_t, iocp_t 66   @see random_access_file, epoll_t, iocp_t
67   */ 67   */
68   template<auto Backend> 68   template<auto Backend>
69   class native_random_access_file : public random_access_file 69   class native_random_access_file : public random_access_file
70   { 70   {
71   using backend_type = decltype(Backend); 71   using backend_type = decltype(Backend);
72   using impl_type = typename backend_type::random_access_file_type; 72   using impl_type = typename backend_type::random_access_file_type;
73   using service_type = typename backend_type::random_access_file_service_type; 73   using service_type = typename backend_type::random_access_file_service_type;
74   74  
HITCBC 75   10 impl_type& get_impl() noexcept 75   10 impl_type& get_impl() noexcept
76   { 76   {
HITCBC 77   10 return *static_cast<impl_type*>(h_.get()); 77   10 return *static_cast<impl_type*>(h_.get());
78   } 78   }
79   79  
80   template<class MutableBufferSequence> 80   template<class MutableBufferSequence>
81   struct native_read_at_awaitable 81   struct native_read_at_awaitable
82   : detail::bytes_op_base<native_read_at_awaitable<MutableBufferSequence>> 82   : detail::bytes_op_base<native_read_at_awaitable<MutableBufferSequence>>
83   { 83   {
84   native_random_access_file& self_; 84   native_random_access_file& self_;
85   std::uint64_t offset_; 85   std::uint64_t offset_;
86   MutableBufferSequence buffers_; 86   MutableBufferSequence buffers_;
  87 + mutable capy::continuation cont_;
87   88  
HITCBC 88   8 native_read_at_awaitable( 89   8 native_read_at_awaitable(
89   native_random_access_file& self, 90   native_random_access_file& self,
90   std::uint64_t offset, 91   std::uint64_t offset,
91   MutableBufferSequence buffers) noexcept 92   MutableBufferSequence buffers) noexcept
HITCBC 92   8 : self_(self) 93   8 : self_(self)
HITCBC 93   8 , offset_(offset) 94   8 , offset_(offset)
HITCBC 94   8 , buffers_(std::move(buffers)) 95   8 , buffers_(std::move(buffers))
95   { 96   {
HITCBC 96   8 } 97   8 }
97   98  
98   std::coroutine_handle<> 99   std::coroutine_handle<>
HITCBC 99   6 dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const 100   6 dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
100   { 101   {
HITGNC   102 + 6 cont_.h = h;
HITCBC 101   12 return self_.get_impl().read_some_at( 103   12 return self_.get_impl().read_some_at(
HITCBC 102 - 6 offset_, h, ex, buffers_, this->token_, &this->ec_, 104 + 6 offset_, cont_, ex, buffers_, this->token_, &this->ec_,
HITCBC 103   12 &this->bytes_); 105   12 &this->bytes_);
104   } 106   }
105   }; 107   };
106   108  
107   template<class ConstBufferSequence> 109   template<class ConstBufferSequence>
108   struct native_write_at_awaitable 110   struct native_write_at_awaitable
109   : detail::bytes_op_base<native_write_at_awaitable<ConstBufferSequence>> 111   : detail::bytes_op_base<native_write_at_awaitable<ConstBufferSequence>>
110   { 112   {
111   native_random_access_file& self_; 113   native_random_access_file& self_;
112   std::uint64_t offset_; 114   std::uint64_t offset_;
113   ConstBufferSequence buffers_; 115   ConstBufferSequence buffers_;
  116 + mutable capy::continuation cont_;
114   117  
HITCBC 115   6 native_write_at_awaitable( 118   6 native_write_at_awaitable(
116   native_random_access_file& self, 119   native_random_access_file& self,
117   std::uint64_t offset, 120   std::uint64_t offset,
118   ConstBufferSequence buffers) noexcept 121   ConstBufferSequence buffers) noexcept
HITCBC 119   6 : self_(self) 122   6 : self_(self)
HITCBC 120   6 , offset_(offset) 123   6 , offset_(offset)
HITCBC 121   6 , buffers_(std::move(buffers)) 124   6 , buffers_(std::move(buffers))
122   { 125   {
HITCBC 123   6 } 126   6 }
124   127  
125   std::coroutine_handle<> 128   std::coroutine_handle<>
HITCBC 126   4 dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const 129   4 dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
127   { 130   {
HITGNC   131 + 4 cont_.h = h;
HITCBC 128   8 return self_.get_impl().write_some_at( 132   8 return self_.get_impl().write_some_at(
HITCBC 129 - 4 offset_, h, ex, buffers_, this->token_, &this->ec_, 133 + 4 offset_, cont_, ex, buffers_, this->token_, &this->ec_,
HITCBC 130   8 &this->bytes_); 134   8 &this->bytes_);
131   } 135   }
132   }; 136   };
133   137  
134   public: 138   public:
135   /** Construct a native random-access file from an execution context. 139   /** Construct a native random-access file from an execution context.
136   140  
137   @param ctx The execution context that owns this file. 141   @param ctx The execution context that owns this file.
138   */ 142   */
HITCBC 139   16 explicit native_random_access_file(capy::execution_context& ctx) 143   16 explicit native_random_access_file(capy::execution_context& ctx)
HITCBC 140   16 : random_access_file(handle(ctx, ctx.use_service<service_type>())) 144   16 : random_access_file(handle(ctx, ctx.use_service<service_type>()))
141   { 145   {
HITCBC 142   16 } 146   16 }
143   147  
144   /** Construct a native random-access file from an executor. 148   /** Construct a native random-access file from an executor.
145   149  
146   @param ex The executor whose context owns this file. 150   @param ex The executor whose context owns this file.
147   */ 151   */
148   template<class Ex> 152   template<class Ex>
149   requires(!std::same_as< 153   requires(!std::same_as<
150   std::remove_cvref_t<Ex>, 154   std::remove_cvref_t<Ex>,
151   native_random_access_file>) && 155   native_random_access_file>) &&
152   capy::Executor<Ex> 156   capy::Executor<Ex>
153   explicit native_random_access_file(Ex const& ex) 157   explicit native_random_access_file(Ex const& ex)
154   : native_random_access_file(ex.context()) 158   : native_random_access_file(ex.context())
155   { 159   {
156   } 160   }
157   161  
158   /// Move construct. 162   /// Move construct.
159   native_random_access_file(native_random_access_file&&) noexcept = default; 163   native_random_access_file(native_random_access_file&&) noexcept = default;
160   164  
161   /// Move assign. 165   /// Move assign.
162   native_random_access_file& 166   native_random_access_file&
163   operator=(native_random_access_file&&) noexcept = default; 167   operator=(native_random_access_file&&) noexcept = default;
164   168  
165   /// Copy construction is disabled; the handle is uniquely owned. 169   /// Copy construction is disabled; the handle is uniquely owned.
166   native_random_access_file(native_random_access_file const&) = delete; 170   native_random_access_file(native_random_access_file const&) = delete;
167   /// Copy assignment is disabled; the handle is uniquely owned. 171   /// Copy assignment is disabled; the handle is uniquely owned.
168   native_random_access_file& 172   native_random_access_file&
169   operator=(native_random_access_file const&) = delete; 173   operator=(native_random_access_file const&) = delete;
170   174  
171   /** Asynchronously read at the given offset. 175   /** Asynchronously read at the given offset.
172   176  
173   Calls the backend implementation directly, bypassing virtual 177   Calls the backend implementation directly, bypassing virtual
174   dispatch. Otherwise identical to @ref random_access_file::read_some_at. 178   dispatch. Otherwise identical to @ref random_access_file::read_some_at.
175   179  
176   @param offset The byte offset to read at. 180   @param offset The byte offset to read at.
177   @param buffers The buffers to read into. 181   @param buffers The buffers to read into.
178   182  
179   @return An awaitable yielding the error code and the byte count read. 183   @return An awaitable yielding the error code and the byte count read.
180   */ 184   */
181   template<capy::MutableBufferSequence MB> 185   template<capy::MutableBufferSequence MB>
HITCBC 182   8 [[nodiscard]] auto read_some_at(std::uint64_t offset, MB const& buffers) 186   8 [[nodiscard]] auto read_some_at(std::uint64_t offset, MB const& buffers)
183   { 187   {
HITCBC 184   8 return native_read_at_awaitable<MB>(*this, offset, buffers); 188   8 return native_read_at_awaitable<MB>(*this, offset, buffers);
185   } 189   }
186   190  
187   /** Asynchronously write at the given offset. 191   /** Asynchronously write at the given offset.
188   192  
189   Calls the backend implementation directly, bypassing virtual 193   Calls the backend implementation directly, bypassing virtual
190   dispatch. Otherwise identical to @ref random_access_file::write_some_at. 194   dispatch. Otherwise identical to @ref random_access_file::write_some_at.
191   195  
192   @param offset The byte offset to write at. 196   @param offset The byte offset to write at.
193   @param buffers The buffer data to write. 197   @param buffers The buffer data to write.
194   198  
195   @return An awaitable yielding the error code and the byte count written. 199   @return An awaitable yielding the error code and the byte count written.
196   */ 200   */
197   template<capy::ConstBufferSequence CB> 201   template<capy::ConstBufferSequence CB>
HITCBC 198   6 [[nodiscard]] auto write_some_at(std::uint64_t offset, CB const& buffers) 202   6 [[nodiscard]] auto write_some_at(std::uint64_t offset, CB const& buffers)
199   { 203   {
HITCBC 200   6 return native_write_at_awaitable<CB>(*this, offset, buffers); 204   6 return native_write_at_awaitable<CB>(*this, offset, buffers);
201   } 205   }
202   }; 206   };
203   207  
204   } // namespace boost::corosio 208   } // namespace boost::corosio
205   209  
206   #endif // BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP 210   #endif // BOOST_COROSIO_NATIVE_NATIVE_RANDOM_ACCESS_FILE_HPP