2a8ebc4906
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
#pragma once
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#include <mln/util/work_task.hpp>
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#include <atomic>
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#include <mutex>
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#include <tuple>
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#include <type_traits>
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#include <utility>
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namespace mln {
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template <class F, class P>
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class WorkTaskImpl : public WorkTask {
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public:
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WorkTaskImpl(F f, P p, std::shared_ptr<std::atomic<bool>> canceled_)
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: canceled(std::move(canceled_)),
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func(std::move(f)),
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params(std::move(p)) {}
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void operator()() override {
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// Lock the mutex while processing so that cancel() will block.
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std::scoped_lock lock(mutex);
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if (!canceled->load(std::memory_order_acquire)) {
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invoke(std::make_index_sequence<std::tuple_size_v<P>>{});
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}
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}
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/// If the task has not yet begun, this will cancel it.
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/// If the task is in progress, this will block until it completed. (Currently
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/// necessary because of shared state, but should be removed.) It will also
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/// cancel the after callback.
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/// If the task has completed, but the after callback has not executed, this
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/// will cancel the after callback.
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/// If the task has completed and the after callback has executed, this will
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/// do nothing.
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void cancel() override {
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std::scoped_lock lock(mutex);
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canceled->store(true, std::memory_order_release);
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}
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private:
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template <std::size_t... I>
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void invoke(std::index_sequence<I...>) {
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func(std::move(std::get<I>(std::forward<P>(params)))...);
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}
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std::recursive_mutex mutex;
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std::shared_ptr<std::atomic<bool>> canceled;
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F func;
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P params;
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};
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template <class Fn, class... Args>
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std::shared_ptr<WorkTask> WorkTask::make(Fn&& fn, Args&&... args) {
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auto flag = std::make_shared<std::atomic<bool>>();
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flag->store(false, std::memory_order_relaxed);
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auto tuple = std::make_tuple(std::forward<Args>(args)...);
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return std::make_shared<WorkTaskImpl<std::decay_t<Fn>, decltype(tuple)>>(
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std::forward<Fn>(fn), std::move(tuple), flag);
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}
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} // namespace mln
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