71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
// Copyright (c) 2015 Amanieu d'Antras
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef ASYNCXX_H_
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# error "Do not include this header directly, include <async++.h> instead."
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#endif
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namespace async {
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namespace detail {
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// Recursively split the arguments so tasks are spawned in parallel
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template<std::size_t Start, std::size_t Count>
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struct parallel_invoke_internal {
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template<typename Sched, typename Tuple>
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static void run(Sched& sched, const Tuple& args)
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{
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auto&& t = async::local_spawn(sched, [&sched, &args] {
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parallel_invoke_internal<Start + Count / 2, Count - Count / 2>::run(sched, args);
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});
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parallel_invoke_internal<Start, Count / 2>::run(sched, args);
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t.get();
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}
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};
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template<std::size_t Index>
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struct parallel_invoke_internal<Index, 1> {
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template<typename Sched, typename Tuple>
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static void run(Sched&, const Tuple& args)
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{
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// Make sure to preserve the rvalue/lvalue-ness of the original parameter
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std::forward<typename std::tuple_element<Index, Tuple>::type>(std::get<Index>(args))();
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}
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};
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template<std::size_t Index>
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struct parallel_invoke_internal<Index, 0> {
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template<typename Sched, typename Tuple>
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static void run(Sched&, const Tuple&) {}
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};
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} // namespace detail
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// Run several functions in parallel, optionally using the specified scheduler.
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template<typename Sched, typename... Args>
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typename std::enable_if<detail::is_scheduler<Sched>::value>::type parallel_invoke(Sched& sched, Args&&... args)
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{
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detail::parallel_invoke_internal<0, sizeof...(Args)>::run(sched, std::forward_as_tuple(std::forward<Args>(args)...));
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}
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template<typename... Args>
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void parallel_invoke(Args&&... args)
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{
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async::parallel_invoke(::async::default_scheduler(), std::forward<Args>(args)...);
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}
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} // namespace async
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