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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| #pragma once | ||
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| #include <cstdint> | ||
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| #include <mpi/core/communicators/communicator.hpp> | ||
| #include <mpi/core/type/type_traits.hpp> | ||
| #include <mpi/core/window.hpp> | ||
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| namespace mpi | ||
| { | ||
| // The type must be compliant. | ||
| // Requires .synchronize() to be called explicitly to ensure synchronization. | ||
| template <typename type> | ||
| class manual_shared_variable | ||
| { | ||
| public: | ||
| explicit manual_shared_variable (const communicator& communicator, const std::int32_t root = 0) | ||
| : communicator_(communicator), root_(root), window_(communicator_, communicator_.rank() == root_ ? type_traits<type>::get_data_type().size() : 0) | ||
| { | ||
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| } | ||
| manual_shared_variable (const manual_shared_variable& that) = delete ; | ||
| manual_shared_variable ( manual_shared_variable&& temp) = default; | ||
| virtual ~manual_shared_variable () = default; | ||
| manual_shared_variable& operator=(const manual_shared_variable& that) = delete ; | ||
| manual_shared_variable& operator=( manual_shared_variable&& temp) = default; | ||
| manual_shared_variable& operator=(const type& value) | ||
| { | ||
| set(value); | ||
| return *this; | ||
| } | ||
| operator type() const | ||
| { | ||
| return get(); | ||
| } | ||
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| void set (const type& value) | ||
| { | ||
| window_.lock (root_, false); | ||
| window_.put (value , root_, 0, 1, type_traits<type>::get_data_type()); | ||
| window_.unlock(root_); | ||
| } | ||
| [[nodiscard]] | ||
| type get () const | ||
| { | ||
| type result {}; | ||
| window_.lock (root_, true); | ||
| window_.get (result, root_, 0, 1, type_traits<type>::get_data_type()); | ||
| window_.unlock(root_); | ||
| return result; | ||
| } | ||
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| void synchronize() const | ||
| { | ||
| window_.fence(); | ||
| } | ||
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| protected: | ||
| const communicator& communicator_; | ||
| std::int32_t root_ ; | ||
| window window_ ; | ||
| }; | ||
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| // The type must be compliant. | ||
| // Calls .synchronize() globally after a .set_if_rank(...), ensuring synchronization. | ||
| // Note that .set_if_rank(...) must be called on all processes in the communicator as if its a collective. | ||
| template <typename type> | ||
| class automatic_shared_variable : public manual_shared_variable<type> | ||
| { | ||
| public: | ||
| using base = manual_shared_variable<type>; | ||
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| explicit automatic_shared_variable (const communicator& communicator, const std::int32_t root = 0) | ||
| : base(communicator, root) | ||
| { | ||
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| } | ||
| automatic_shared_variable (const automatic_shared_variable& that) = delete ; | ||
| automatic_shared_variable ( automatic_shared_variable&& temp) = default; | ||
| ~automatic_shared_variable () override = default; | ||
| automatic_shared_variable& operator=(const automatic_shared_variable& that) = delete ; | ||
| automatic_shared_variable& operator=( automatic_shared_variable&& temp) = default; | ||
| automatic_shared_variable& operator=(const type& value) = delete ; | ||
| operator type() const | ||
| { | ||
| return base::get(); | ||
| } | ||
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| void set_if_rank(const type& value, const std::int32_t rank) | ||
| { | ||
| if (base::communicator_.rank() == rank) | ||
| base::set(value); | ||
| base::synchronize(); | ||
| } | ||
| }; | ||
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| template <typename type> | ||
| using shared_variable = automatic_shared_variable<type>; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,3 @@ | ||
| #include <iostream> | ||
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| #include "internal/doctest.h" | ||
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| #define MPI_USE_EXCEPTIONS | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| #include "internal/doctest.h" | ||
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| #define MPI_USE_EXCEPTIONS | ||
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| #include <mpi/all.hpp> | ||
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| TEST_CASE("Shared Variable Test") | ||
| { | ||
| mpi::environment environment ; | ||
| const auto& communicator = mpi::world_communicator; | ||
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| { | ||
| mpi::manual_shared_variable<std::int32_t> variable(communicator); | ||
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| if (communicator.rank() == 0) | ||
| variable = 42; | ||
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| variable.synchronize(); // :( | ||
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| if (communicator.rank() != 0) | ||
| REQUIRE(variable == 42); | ||
| } | ||
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| { | ||
| mpi::manual_shared_variable<std::array<std::int32_t, 3>> variable(communicator); | ||
| if (communicator.rank() == 0) | ||
| variable = {1, 2, 3}; | ||
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| variable.synchronize(); // :( | ||
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| if (communicator.rank() != 0) | ||
| { | ||
| auto value = variable.get(); | ||
| REQUIRE(value[0] == 1); | ||
| REQUIRE(value[1] == 2); | ||
| REQUIRE(value[2] == 3); | ||
| } | ||
| } | ||
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| { | ||
| mpi::shared_variable<std::int32_t> variable(communicator); | ||
| variable.set_if_rank(42, 0); | ||
| if (communicator.rank() != 0) | ||
| REQUIRE(variable == 42); | ||
| } | ||
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| { | ||
| mpi::shared_variable<std::array<std::int32_t, 3>> variable(communicator); | ||
| variable.set_if_rank({1, 2, 3}, 0); | ||
| if (communicator.rank() != 0) | ||
| { | ||
| auto value = variable.get(); | ||
| REQUIRE(value[0] == 1); | ||
| REQUIRE(value[1] == 2); | ||
| REQUIRE(value[2] == 3); | ||
| } | ||
| } | ||
| } |