parallel_for.hpp

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#ifndef KOKKOS_EXECUTION_PARALLEL_FOR_HPP
#define KOKKOS_EXECUTION_PARALLEL_FOR_HPP
 
#include "kokkos-execution/impl/attributes.hpp"
#include "kokkos-execution/impl/completion_signatures.hpp"
#include "kokkos-execution/impl/env.hpp"
 
namespace Kokkos::Execution {
 
namespace Impl {
 
template <stdexec::sender Sndr, typename Label, typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
struct ParallelForSender;
 
} // namespace Impl

struct parallel_for_t {
    template <typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
    constexpr auto operator()(std::string label, ExecPolicy policy, Functor functor) const {
        return stdexec::__closure(*this, std::move(label), std::move(policy), std::move(functor));
    }
 
    template <typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
    constexpr auto operator()(ExecPolicy policy, Functor functor) const {
        return this->operator()("", std::move(policy), std::move(functor));
    }
 
    template <typename Functor, std::integral T>
    constexpr auto operator()(std::string label, const T work_count, Functor functor) const {
        using execution_space =
            typename Kokkos::Impl::FunctorPolicyExecutionSpace<std::remove_cvref_t<Functor>, void>::execution_space;
        using policy_t = Kokkos::RangePolicy<execution_space>;
 
        return this->operator()(std::move(label), policy_t(0, work_count), std::move(functor));
    }

    template <typename Functor, std::integral T>
    constexpr auto operator()(const T work_count, Functor functor) const {
        return this->operator()("", work_count, std::move(functor));
    }
 
    template <stdexec::sender Sndr, typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
    constexpr auto operator()(Sndr&& sndr, std::string label, ExecPolicy policy, Functor functor) const {
        return Impl::ParallelForSender<Sndr, std::string, Functor, ExecPolicy>(
            {std::move(label), std::move(functor), std::move(policy)}, std::forward<Sndr>(sndr));
    }
};
 
namespace Impl {
 
template <typename Label, typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
struct ParallelForData {
    using label_t = Label;
    using functor_t = Functor;
    using policy_t = ExecPolicy;
 
    label_t label;
    functor_t functor;
    policy_t policy;
};
 
template <stdexec::sender Sndr, typename Label, typename Functor, Kokkos::ExecutionPolicy ExecPolicy>
struct ParallelForSender : stdexec::__tuple<parallel_for_t, ParallelForData<Label, Functor, ExecPolicy>, Sndr> {
    using sender_concept = stdexec::sender_tag;
 
    using base_t = stdexec::__tuple<parallel_for_t, ParallelForData<Label, Functor, ExecPolicy>, Sndr>;
 
    ParallelForSender(
        ParallelForData<Label, Functor, ExecPolicy> data,
        Sndr&& sndr) // NOLINT(cppcoreguidelines-rvalue-reference-param-not-moved)
        : base_t{parallel_for_t{}, std::move(data), std::forward<Sndr>(sndr)} {
    }
 
    KOKKOS_EXECUTION_COMPL_SIGS_ADD(ParallelForSender, Sndr, stdexec::set_error_t(std::exception_ptr))
 
    template <stdexec::receiver Rcvr>
    constexpr auto connect(Rcvr) && = delete;
 
    template <stdexec::receiver Rcvr>
    constexpr auto connect(Rcvr) const & = delete;
 
    static constexpr size_t idx_sndr = 2;
    KOKKOS_EXECUTION_IMPL_FORWARDING_ATTRIBUTES_GET_ENV(
        Sndr,
        stdexec::__get<idx_sndr>(static_cast<const base_t&>(*this)))
};
 
} // namespace Impl
 
inline constexpr parallel_for_t parallel_for{};
 
} // namespace Kokkos::Execution
 
#endif // KOKKOS_EXECUTION_PARALLEL_FOR_HPP