84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_JOB_DISPATCH_HPP
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#define CRUFT_UTIL_JOB_DISPATCH_HPP
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#include "queue.hpp"
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#include "../extent.hpp"
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#include "../region.hpp"
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#include <vector>
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namespace util::job {
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// call a function across all elements of a container using the supplied
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// job queue.
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//
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// threads will have work sizes dictated by a supplied extent.
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//
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// returns a cookie that will block at destruction until all jobs have
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// completed. it will take ownership of an forwarding-reference function
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// if one is supplied.
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//
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// TODO: extend to 1d and 3d
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template <
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typename ContainerT,
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typename FunctionT,
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typename ...Args,
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size_t DimensionV
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>
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auto
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dispatch (
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util::job::queue &q,
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ContainerT &data,
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util::extent<DimensionV,int> chunk,
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FunctionT &&func,
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Args ...args)
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{
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auto chunked_func = [&func] (ContainerT &inner_data,
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auto param,
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Args... inner_args)
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{
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for (auto p: param) {
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if (!inner_data.extent ().exclusive (p))
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continue;
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inner_data[p][0] = std::invoke (func, p, inner_args...);
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}
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};
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std::vector<queue::cookie> cookies;
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const extent2i count = (data.extent () + chunk - 1) / chunk;
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for (auto index: count.step ()) {
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util::point<DimensionV,int> base = index * chunk;
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cookies.push_back (
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q.submit (
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chunked_func,
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std::ref (data),
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util::region<DimensionV,int> {base, chunk}.step (),
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args...
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)
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);
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}
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return std::tuple (std::forward<FunctionT> (func), std::move (cookies));
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}
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}
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#endif
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