Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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 cruft::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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cruft::job::queue &q,
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ContainerT &data,
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cruft::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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cruft::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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cruft::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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