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added a write-up of creating a simple sender #285
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b5458e5
added a write-up of creating a simple sender
dietmarkuehl ec687cf
address AI review feedback
dietmarkuehl 13bbb07
fixed formatting
dietmarkuehl 3137bda
fixed a trailing space in the .md file
dietmarkuehl 1ad75b6
fixed a problem with destroying the object while the operation is sto…
dietmarkuehl 730ade2
fix concurrent destruction prevention for stop_when
dietmarkuehl 12823a6
clang format
dietmarkuehl bad5162
fixed a missing header and some inconsistencies
dietmarkuehl 88c482a
Merge branch 'main' into doc-create-a-sender
dietmarkuehl ce9ba0d
tried to fix some issues with stop tokens
dietmarkuehl a76f389
trying to fix inplace_stop_source
dietmarkuehl 84c5d4d
making a function inline to avoid a linker problem.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| // examples/tutorial/create-a-sender.cpp -*-C++-*- | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
|
|
||
| #include <iostream> | ||
| #include <optional> | ||
| #include <stack> | ||
| #ifdef BEMAN_HAS_MODULES | ||
| import beman.execution; | ||
| import beman.execution.detail; | ||
| #else | ||
| #include <beman/execution/execution.hpp> | ||
| #endif | ||
|
|
||
| namespace ex = beman::execution; | ||
|
|
||
| namespace { | ||
| template <typename T> | ||
| class asynchronous_stack { | ||
| struct node { | ||
| node* next{}; | ||
| virtual void complete(T) = 0; | ||
| }; | ||
| std::stack<T> stack; | ||
| node* awaiting{}; | ||
|
|
||
| template <ex::receiver Rcvr> | ||
| struct state : node { | ||
| using operation_state_concept = ex::operation_state_tag; | ||
| struct stop_fun { | ||
| state& st; | ||
| void operator()() noexcept { | ||
| std::cout << "stop callback start\n"; | ||
| state& s = this->st; | ||
| this->st.callback.reset(); | ||
| for (auto it{&this->st.self.awaiting}; it; it = &(*it)->next) { | ||
| if (*it == &this->st) { | ||
| *it = this->st.next; | ||
| break; | ||
| } | ||
| } | ||
| std::cout << "stop callback completing\n"; | ||
| ex::set_stopped(std::move(s.rcvr)); | ||
| std::cout << "stop callback done\n"; | ||
| } | ||
| }; | ||
| using stop_token_t = ex::stop_token_of_t<decltype(ex::get_env(std::declval<Rcvr&>()))>; | ||
| using callback_t = ex::stop_callback_for_t<stop_token_t, stop_fun>; | ||
| std::remove_cvref_t<Rcvr> rcvr; | ||
| asynchronous_stack& self; | ||
| std::optional<callback_t> callback; | ||
| state(Rcvr&& r, asynchronous_stack& s) : rcvr(std::forward<Rcvr>(r)), self(s) {} | ||
| void start() & noexcept { | ||
| if (not this->self.stack.empty()) { | ||
| T value(std::move(this->self.stack.top())); | ||
| this->self.stack.pop(); | ||
| ex::set_value(std::move(rcvr), std::move(value)); | ||
| } else { | ||
| this->next = std::exchange(this->self.awaiting, this); | ||
| this->callback.emplace(ex::get_stop_token(ex::get_env(this->rcvr)), stop_fun{*this}); | ||
| } | ||
| } | ||
| void complete(T value) override { | ||
| this->callback.reset(); | ||
| ex::set_value(std::move(rcvr), std::move(value)); | ||
| } | ||
| }; | ||
|
|
||
| public: | ||
| struct pop_sender { | ||
| using sender_concept = ex::sender_tag; | ||
| template <typename...> | ||
| static consteval auto get_completion_signatures() { | ||
| return ex::completion_signatures<ex::set_value_t(T), ex::set_stopped_t()>{}; | ||
| } | ||
|
|
||
| asynchronous_stack& self; | ||
| template <ex::receiver Rcvr> | ||
| auto connect(Rcvr&& rcvr) const { | ||
| static_assert(ex::operation_state<state<Rcvr>>); | ||
| return state<Rcvr>{std::forward<Rcvr>(rcvr), self}; | ||
| } | ||
| }; | ||
|
|
||
| void push(T value) { | ||
| if (this->awaiting) { | ||
| std::exchange(this->awaiting, this->awaiting->next)->complete(std::move(value)); | ||
| } else { | ||
| this->stack.push(std::move(value)); | ||
| } | ||
| } | ||
| pop_sender pop() { return pop_sender{*this}; } | ||
| }; | ||
|
|
||
| static_assert(ex::sender<asynchronous_stack<int>::pop_sender>); | ||
| static_assert(ex::sender_in<asynchronous_stack<int>::pop_sender>); | ||
|
|
||
| struct stop_test { | ||
| using sender_concept = ex::sender_tag; | ||
| template <typename...> | ||
| static consteval auto get_completion_signatures() { | ||
| return ex::completion_signatures<ex::set_value_t()>(); | ||
| } | ||
| template <typename Rcvr> | ||
| struct state { | ||
| using operation_state_concept = ex::operation_state_tag; | ||
|
|
||
| struct cb { | ||
| state* self; | ||
| auto operator()() const noexcept -> void { | ||
| std::cout << "cb\n"; | ||
| ex::set_value(std::move(self->rcvr)); | ||
| } | ||
| }; | ||
| using callback = ex::stop_callback_for_t<ex::stop_token_of_t<ex::env_of_t<Rcvr>>, cb>; | ||
|
|
||
| std::remove_cvref_t<Rcvr> rcvr; | ||
| std::optional<callback> callb; | ||
| auto start() & noexcept -> void { | ||
| std::cout << "stop_test start\n"; | ||
| this->callb.emplace(ex::get_stop_token(ex::get_env(this->rcvr)), cb{this}); | ||
| } | ||
| }; | ||
| template <typename Rcvr> | ||
| state<Rcvr> connect(Rcvr&& rcvr) const { | ||
| return {std::forward<Rcvr>(rcvr)}; | ||
| } | ||
| }; | ||
| } // namespace | ||
| // ---------------------------------------------------------------------------- | ||
|
|
||
| int main() { | ||
| std::cout << std::unitbuf; | ||
| #if 1 | ||
| asynchronous_stack<int> st; | ||
| ex::counting_scope scope; | ||
| [[maybe_unused]] auto sender = st.pop() | ex::then([](int v) { std::cout << "got value=" << v << "\n"; }); | ||
|
|
||
| #if 1 | ||
| for (int value{1}; value < 4; ++value) { | ||
| st.push(value); | ||
| } | ||
| std::cout << "pushed 1,2,3\n"; | ||
|
|
||
| int count{8}; | ||
| for (int value{1}; value < count; ++value) { | ||
| ex::spawn(st.pop() | ex::then([value](int v) noexcept { | ||
| std::cout << "got value=" << v << " for request " << value << "\n"; | ||
| }) | ex::upon_stopped([value] noexcept { std::cout << "request " << value << " was stopped\n"; }), | ||
| scope.get_token()); | ||
| } | ||
|
|
||
| std::cout << "requested " << (count - 1) << " values\n"; | ||
|
|
||
| for (int value{4}; value < 7; ++value) { | ||
| st.push(value); | ||
| } | ||
| std::cout << "pushed 4,5,6\n"; | ||
| #endif | ||
|
|
||
| std::cout << "requesting stop\n"; | ||
| scope.request_stop(); | ||
| std::cout << "requested stop\n"; | ||
| ex::sync_wait(scope.join() | ex::then([] { std::cout << "joined\n"; })); | ||
| std::cout << "joined\n"; | ||
| #else | ||
|
|
||
| std::optional<ex::inplace_stop_source> source1{}; | ||
| source1.emplace(); | ||
| std::optional<ex::inplace_stop_source> source2{}; | ||
| source2.emplace(); | ||
| struct receiver { | ||
| using receiver_concept = ex::receiver_tag; | ||
| std::optional<ex::inplace_stop_source>& source1; | ||
| std::optional<ex::inplace_stop_source>& source2; | ||
| auto query(ex::get_stop_token_t) const noexcept { return this->source2->get_token(); } | ||
| auto get_env() const noexcept { | ||
| std::cout << "get_env\n"; | ||
| return *this; | ||
| } | ||
| auto set_value() noexcept { | ||
| std::cout << "receiver::set_value\n"; | ||
| source1.reset(); | ||
| std::cout << "receiver::set_value done\n"; | ||
| } | ||
| auto set_stopped() noexcept { std::cout << "receiver::set_stopped\n"; } | ||
| }; | ||
| #if 1 | ||
| auto sws(ex::connect(ex::detail::stop_when(stop_test(), source1->get_token()), receiver{source1, source2})); | ||
| #else | ||
| auto sws(ex::connect(stop_test(), receiver{source1, source2})); | ||
| #endif | ||
| std::cout << "start\n"; | ||
| ex::start(sws); | ||
| std::cout << "request stop\n"; | ||
| source1->request_stop(); | ||
| std::cout << "requested stop\n"; | ||
| #endif | ||
| } |
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[pre-commit] reported by reviewdog 🐶