. /include/boost/corosio /native /native_signal_set.hpp
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1   // 1   //
2   // Copyright (c) 2026 Steve Gerbino 2   // Copyright (c) 2026 Steve Gerbino
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 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) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/corosio 7   // Official repository: https://github.com/cppalliance/corosio
8   // 8   //
9   9  
10   #ifndef BOOST_COROSIO_NATIVE_NATIVE_SIGNAL_SET_HPP 10   #ifndef BOOST_COROSIO_NATIVE_NATIVE_SIGNAL_SET_HPP
11   #define BOOST_COROSIO_NATIVE_NATIVE_SIGNAL_SET_HPP 11   #define BOOST_COROSIO_NATIVE_NATIVE_SIGNAL_SET_HPP
12   12  
13   #include <boost/corosio/signal_set.hpp> 13   #include <boost/corosio/signal_set.hpp>
14   #include <boost/corosio/backend.hpp> 14   #include <boost/corosio/backend.hpp>
15   #include <boost/corosio/detail/op_base.hpp> 15   #include <boost/corosio/detail/op_base.hpp>
16   16  
17   #ifndef BOOST_COROSIO_MRDOCS 17   #ifndef BOOST_COROSIO_MRDOCS
18   #if BOOST_COROSIO_HAS_EPOLL || BOOST_COROSIO_HAS_SELECT || \ 18   #if BOOST_COROSIO_HAS_EPOLL || BOOST_COROSIO_HAS_SELECT || \
19   BOOST_COROSIO_HAS_KQUEUE 19   BOOST_COROSIO_HAS_KQUEUE
20   #include <boost/corosio/native/detail/posix/posix_signal_service.hpp> 20   #include <boost/corosio/native/detail/posix/posix_signal_service.hpp>
21   #endif 21   #endif
22   22  
23   #if BOOST_COROSIO_HAS_IOCP 23   #if BOOST_COROSIO_HAS_IOCP
24   #include <boost/corosio/native/detail/iocp/win_signals.hpp> 24   #include <boost/corosio/native/detail/iocp/win_signals.hpp>
25   #endif 25   #endif
26   #endif // !BOOST_COROSIO_MRDOCS 26   #endif // !BOOST_COROSIO_MRDOCS
27   27  
28   namespace boost::corosio { 28   namespace boost::corosio {
29   29  
30   /** An asynchronous signal set with devirtualized wait operations. 30   /** An asynchronous signal set with devirtualized wait operations.
31   31  
32   This class template inherits from @ref signal_set and shadows 32   This class template inherits from @ref signal_set and shadows
33   the `wait` operation with a version that calls the backend 33   the `wait` operation with a version that calls the backend
34   implementation directly, allowing the compiler to inline 34   implementation directly, allowing the compiler to inline
35   through the entire call chain. 35   through the entire call chain.
36   36  
37   Non-async operations (`add`, `remove`, `clear`, `cancel`) 37   Non-async operations (`add`, `remove`, `clear`, `cancel`)
38   remain unchanged and dispatch through the compiled library. 38   remain unchanged and dispatch through the compiled library.
39   39  
40   A `native_signal_set` IS-A `signal_set` and can be passed to 40   A `native_signal_set` IS-A `signal_set` and can be passed to
41   any function expecting `signal_set&`. 41   any function expecting `signal_set&`.
42   42  
43   @tparam Backend A backend tag value (e.g., `epoll`). 43   @tparam Backend A backend tag value (e.g., `epoll`).
44   44  
45   @par Thread Safety 45   @par Thread Safety
46   Same as @ref signal_set. 46   Same as @ref signal_set.
47   47  
48   @see signal_set, epoll_t, iocp_t 48   @see signal_set, epoll_t, iocp_t
49   */ 49   */
50   template<auto Backend> 50   template<auto Backend>
51   class native_signal_set : public signal_set 51   class native_signal_set : public signal_set
52   { 52   {
53   using backend_type = decltype(Backend); 53   using backend_type = decltype(Backend);
54   using impl_type = typename backend_type::signal_type; 54   using impl_type = typename backend_type::signal_type;
55   55  
56   impl_type& get_impl() noexcept 56   impl_type& get_impl() noexcept
57   { 57   {
58   return *static_cast<impl_type*>(h_.get()); 58   return *static_cast<impl_type*>(h_.get());
59   } 59   }
60   60  
61   struct native_wait_awaitable 61   struct native_wait_awaitable
62   : detail::value_op_base<native_wait_awaitable, int> 62   : detail::value_op_base<native_wait_awaitable, int>
63   { 63   {
64   native_signal_set& self_; 64   native_signal_set& self_;
65   65  
66   explicit native_wait_awaitable(native_signal_set& self) noexcept 66   explicit native_wait_awaitable(native_signal_set& self) noexcept
67   : self_(self) 67   : self_(self)
68   { 68   {
69   } 69   }
70   70  
71   std::coroutine_handle<> 71   std::coroutine_handle<>
72   dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const 72   dispatch(std::coroutine_handle<> h, capy::executor_ref ex) const
73   { 73   {
74   return self_.get_impl().wait( 74   return self_.get_impl().wait(
75   h, ex, this->token_, &this->ec_, &this->value_); 75   h, ex, this->token_, &this->ec_, &this->value_);
76   } 76   }
77   }; 77   };
78   78  
79   public: 79   public:
80   /** Construct a native signal set from an execution context. 80   /** Construct a native signal set from an execution context.
81   81  
82   @param ctx The execution context that will own this signal set. 82   @param ctx The execution context that will own this signal set.
83   */ 83   */
HITCBC 84   2 explicit native_signal_set(capy::execution_context& ctx) : signal_set(ctx) 84   2 explicit native_signal_set(capy::execution_context& ctx) : signal_set(ctx)
85   { 85   {
HITCBC 86   2 } 86   2 }
87   87  
88   /** Construct a native signal set with initial signals. 88   /** Construct a native signal set with initial signals.
89   89  
90   @param ctx The execution context that will own this signal set. 90   @param ctx The execution context that will own this signal set.
91   @param signal First signal number to add. 91   @param signal First signal number to add.
92   @param signals Additional signal numbers to add. 92   @param signals Additional signal numbers to add.
93   93  
94   @throws std::system_error on failure. 94   @throws std::system_error on failure.
95   95  
96   @see add for the non-throwing form: construct with the 96   @see add for the non-throwing form: construct with the
97   context alone, then `add()` each signal. 97   context alone, then `add()` each signal.
98   */ 98   */
99   template<std::convertible_to<int>... Signals> 99   template<std::convertible_to<int>... Signals>
HITCBC 100   4 native_signal_set( 100   4 native_signal_set(
101   capy::execution_context& ctx, int signal, Signals... signals) 101   capy::execution_context& ctx, int signal, Signals... signals)
HITCBC 102   4 : signal_set(ctx, signal, signals...) 102   4 : signal_set(ctx, signal, signals...)
103   { 103   {
HITCBC 104   4 } 104   4 }
105   105  
106   /** Move construct. 106   /** Move construct.
107   107  
108   @param other The signal set to move from. 108   @param other The signal set to move from.
109   109  
110   @pre No awaitables returned by @p other's methods exist. 110   @pre No awaitables returned by @p other's methods exist.
111   @pre The execution context associated with @p other must 111   @pre The execution context associated with @p other must
112   outlive this signal set. 112   outlive this signal set.
113   */ 113   */
114   native_signal_set(native_signal_set&&) noexcept = default; 114   native_signal_set(native_signal_set&&) noexcept = default;
115   115  
116   /** Move assign. 116   /** Move assign.
117   117  
118   @param other The signal set to move from. 118   @param other The signal set to move from.
119   119  
120   @pre No awaitables returned by either `*this` or @p other's 120   @pre No awaitables returned by either `*this` or @p other's
121   methods exist. 121   methods exist.
122   @pre The execution context associated with @p other must 122   @pre The execution context associated with @p other must
123   outlive this signal set. 123   outlive this signal set.
124   */ 124   */
125   native_signal_set& operator=(native_signal_set&&) noexcept = default; 125   native_signal_set& operator=(native_signal_set&&) noexcept = default;
126   126  
127   native_signal_set(native_signal_set const&) = delete; 127   native_signal_set(native_signal_set const&) = delete;
128   native_signal_set& operator=(native_signal_set const&) = delete; 128   native_signal_set& operator=(native_signal_set const&) = delete;
129   129  
130   /** Wait for a signal to be delivered. 130   /** Wait for a signal to be delivered.
131   131  
132   Calls the backend implementation directly, bypassing virtual 132   Calls the backend implementation directly, bypassing virtual
133   dispatch. Otherwise identical to @ref signal_set::wait. 133   dispatch. Otherwise identical to @ref signal_set::wait.
134   134  
135   @return An awaitable yielding `io_result<int>`. 135   @return An awaitable yielding `io_result<int>`.
136   136  
137   This signal set must outlive the returned awaitable. 137   This signal set must outlive the returned awaitable.
138   */ 138   */
139   [[nodiscard]] auto wait() 139   [[nodiscard]] auto wait()
140   { 140   {
141   return native_wait_awaitable(*this); 141   return native_wait_awaitable(*this);
142   } 142   }
143   }; 143   };
144   144  
145   } // namespace boost::corosio 145   } // namespace boost::corosio
146   146  
147   #endif 147   #endif