mirror of
https://github.com/open-mmlab/mmdeploy.git
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175 lines
5.3 KiB
C
175 lines
5.3 KiB
C
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// Copyright (c) OpenMMLab. All rights reserved.
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// Modified from
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// https://github.com/brycelelbach/wg21_p2300_std_execution/blob/main/include/execution.hpp
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#ifndef MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_SPLIT_H_
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#define MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_SPLIT_H_
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#include "closure.h"
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#include "concepts.h"
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#include "utility.h"
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namespace mmdeploy {
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namespace __split {
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template <typename SharedState>
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struct _Receiver {
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struct type;
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};
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template <typename SharedState>
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using receiver_t = typename _Receiver<SharedState>::type;
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struct _OperationBase {
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_OperationBase* next_;
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void (*notify_)(_OperationBase*) noexcept;
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};
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template <typename SharedState>
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struct _Receiver<SharedState>::type {
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SharedState& shared_state_;
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template <typename... As>
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friend void tag_invoke(set_value_t, type&& self, As&&... as) noexcept {
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auto& state = self.shared_state_;
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state.data_.emplace((As &&) as...);
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state._Notify();
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}
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};
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template <typename Sender>
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struct _SharedState {
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std::optional<completion_signatures_of_t<Sender>> data_;
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using Receiver = receiver_t<_SharedState>;
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connect_result_t<Sender, Receiver> op_state2_;
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std::atomic<void*> head_{nullptr};
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explicit _SharedState(Sender& sender)
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: op_state2_(Connect((Sender &&) sender, Receiver{*this})) {}
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void _Notify() noexcept {
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void* const completion_state = static_cast<void*>(this);
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void* old = head_.exchange(completion_state, std::memory_order_acq_rel);
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auto* op_state = static_cast<_OperationBase*>(old);
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while (op_state != nullptr) {
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_OperationBase* next = op_state->next_;
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op_state->notify_(op_state);
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op_state = next;
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}
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}
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};
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template <typename Sender, typename Receiver>
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struct _Operation {
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struct type;
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};
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template <typename Sender, typename Receiver>
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using operation_t = typename _Operation<Sender, remove_cvref_t<Receiver>>::type;
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template <typename Sender, typename Receiver>
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struct _Operation<Sender, Receiver>::type : _OperationBase {
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Receiver receiver_;
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std::shared_ptr<_SharedState<Sender>> shared_state_;
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type(Receiver&& receiver, std::shared_ptr<_SharedState<Sender>> shared_state)
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: _OperationBase{nullptr, _Notify},
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receiver_(std::move(receiver)),
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shared_state_(std::move(shared_state)) {}
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static void _Notify(_OperationBase* self) noexcept {
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auto op = static_cast<type*>(self);
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std::apply([&](const auto&... args) { SetValue(std::move(op->receiver_), args...); },
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op->shared_state_->data_.value());
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}
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friend void tag_invoke(start_t, type& self) {
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auto shared_state = self.shared_state_.get();
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std::atomic<void*>& head = shared_state->head_;
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void* const completion_state = static_cast<void*>(shared_state);
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void* old = head.load(std::memory_order_acquire);
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do {
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if (old == completion_state) {
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self._Notify(&self);
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return;
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}
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self.next_ = static_cast<_OperationBase*>(old);
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} while (!head.compare_exchange_weak(old, static_cast<void*>(&self), std::memory_order_release,
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std::memory_order_acquire));
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if (old == nullptr) {
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Start(shared_state->op_state2_);
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}
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}
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};
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template <typename Sender>
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struct _Sender {
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struct type;
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};
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template <typename Sender>
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using sender_t = typename _Sender<remove_cvref_t<Sender>>::type;
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template <typename Sender>
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struct _Sender<Sender>::type {
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using SharedState = _SharedState<Sender>;
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template <typename Receiver>
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using _operation_t = operation_t<Sender, Receiver>;
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using value_types = completion_signatures_of_t<Sender>;
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Sender sender_;
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std::shared_ptr<SharedState> shared_state_;
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explicit type(Sender sender)
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: sender_(std::move(sender)), shared_state_{std::make_shared<SharedState>(sender_)} {}
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template <typename Self, typename Receiver, _decays_to<Self, type, int> = 0>
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friend auto tag_invoke(connect_t, Self&& self, Receiver&& receiver) -> _operation_t<Receiver> {
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return _operation_t<Receiver>((Receiver &&) receiver, self.shared_state_);
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}
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};
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struct split_t {
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template <
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typename Sender,
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std::enable_if_t<
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_is_sender<Sender> && _tag_invocable_with_completion_scheduler<split_t, Sender>, int> = 0>
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auto operator()(Sender&& sender) const {
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auto scheduler = GetCompletionScheduler(sender);
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return tag_invoke(split_t{}, std::move(scheduler), (Sender &&) sender);
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}
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template <typename Sender,
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std::enable_if_t<_is_sender<Sender> &&
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!_tag_invocable_with_completion_scheduler<split_t, Sender> &&
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tag_invocable<split_t, Sender>,
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int> = 0>
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auto operator()(Sender&& sender) const {
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return tag_invoke(split_t{}, (Sender &&) sender);
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}
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template <typename Sender,
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std::enable_if_t<_is_sender<Sender> &&
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!_tag_invocable_with_completion_scheduler<split_t, Sender> &&
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!tag_invocable<split_t, Sender>,
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int> = 0>
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sender_t<Sender> operator()(Sender&& sender) const {
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return sender_t<Sender>{(Sender &&) sender};
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}
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_BinderBack<split_t> operator()() const { return {{}, {}, {}}; }
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};
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} // namespace __split
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using __split::split_t;
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inline constexpr split_t Split{};
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} // namespace mmdeploy
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#endif // MMDEPLOY_CSRC_EXPERIMENTAL_EXECUTION_SPLIT_H_
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