add uring_context

CMakeLists.txt

@@ -11,6 +11,8 @@ set(TARGET_LIBRARY beman_${TARGET_NAME})
 set(TARGET_ALIAS beman::${TARGET_NAME})
 set(TARGETS_EXPORT_NAME ${CMAKE_PROJECT_NAME})
 
+option(BEMAN_NET_WITH_URING "Enable liburing io context" OFF)
+
 include(FetchContent)
 FetchContent_Declare(
     execution

examples/CMakeLists.txt

@@ -20,6 +20,12 @@ set(xEXAMPLES taps)
 foreach(EXAMPLE ${EXAMPLES})
     set(EXAMPLE_TARGET ${TARGET_PREFIX}.examples.${EXAMPLE})
     add_executable(${EXAMPLE_TARGET})
+    if(BEMAN_NET_WITH_URING)
+        target_compile_definitions(
+            ${EXAMPLE_TARGET}
+            PRIVATE BEMAN_NET_USE_URING
+        )
+    endif()
     target_sources(${EXAMPLE_TARGET} PRIVATE ${EXAMPLE}.cpp)
     target_link_libraries(${EXAMPLE_TARGET} PRIVATE ${TARGET_LIBRARY})
     target_link_libraries(${EXAMPLE_TARGET} PRIVATE beman::task)

examples/demo_task.hpp

@@ -184,8 +184,12 @@ struct task {
                 state->callback.reset();
                 state->handle->stop_state = task::stop_state::stopping;
                 state->handle->stop_source.request_stop();
-                if (state->handle->stop_state == task::stop_state::stopped)
+                if (state->handle->stop_state == task::stop_state::stopped) {
                     this->object->handle->state->complete_stopped();
+                } else {
+                    // transition back to running so sender_awaiter::stop() can safely complete later
+                    state->handle->stop_state = task::stop_state::running;
+                }
             }
         };
         using stop_token    = decltype(ex::get_stop_token(ex::get_env(::std::declval<Receiver>())));

include/beman/net/detail/io_context.hpp

@@ -10,14 +10,17 @@
 #include <beman/net/detail/container.hpp>
 #include <beman/net/detail/context_base.hpp>
 #include <beman/net/detail/io_context_scheduler.hpp>
+#ifdef BEMAN_NET_USE_URING
+#include <beman/net/detail/uring_context.hpp>
+#else
 #include <beman/net/detail/poll_context.hpp>
+#endif
 #include <beman/net/detail/repeat_effect_until.hpp>
 #include <beman/execution/execution.hpp>
 
 #include <cstdint>
 #include <sys/socket.h>
 #include <unistd.h>
-#include <poll.h>
 #include <cerrno>
 #include <csignal>
 #include <limits>
@@ -33,8 +36,12 @@ class io_context;
 
 class beman::net::io_context {
   private:
+#ifdef BEMAN_NET_USE_URING
+    ::std::unique_ptr<::beman::net::detail::context_base> d_owned{new ::beman::net::detail::uring_context()};
+#else
     ::std::unique_ptr<::beman::net::detail::context_base> d_owned{new ::beman::net::detail::poll_context()};
-    ::beman::net::detail::context_base&                   d_context{*this->d_owned};
+#endif
+    ::beman::net::detail::context_base& d_context{*this->d_owned};
 
   public:
     using scheduler_type = ::beman::net::detail::io_context_scheduler;

include/beman/net/detail/sender.hpp

@@ -113,14 +113,14 @@ struct beman::net::detail::sender_state : Desc::operation, ::beman::net::detail:
         }
     }
     auto complete() -> void override final {
-        d_callback.reset();
         if (0 == --this->d_outstanding) {
+            d_callback.reset();
             this->d_data.set_value(*this, ::std::move(this->d_receiver));
         }
     }
     auto error(::std::error_code err) -> void override final {
-        d_callback.reset();
         if (0 == --this->d_outstanding) {
+            d_callback.reset();
             ::beman::net::detail::ex::set_error(::std::move(this->d_receiver), std::move(err));
         }
     }