63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
/*
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* Copyright (c) 2018 The BitShares Blockchain, and contributors.
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*
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* The MIT License
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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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*/
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#pragma once
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#include <fc/thread/task.hpp>
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#include <fc/asio.hpp>
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/* NOTE: the methods in this header are NOT to be mixed up with fc's
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* multithreading. Parallel functions MUST NOT call fc::thread::yield NOR
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* use fc's mutexes etc.!
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*/
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namespace fc {
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namespace detail {
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template<typename Task>
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class parallel_completion_handler {
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public:
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parallel_completion_handler( Task* task ) : _task(task) {}
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void operator()() { _task->run(); }
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private:
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Task* _task;
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};
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}
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/**
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* Calls function <code>f</code> in a separate thread and returns a future
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* that can be used to wait on the result.
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*
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* @param f the operation to perform
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*/
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template<typename Functor>
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auto do_parallel( Functor&& f, const char* desc FC_TASK_NAME_DEFAULT_ARG ) -> fc::future<decltype(f())> {
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typedef decltype(f()) Result;
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typedef typename fc::deduce<Functor>::type FunctorType;
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fc::task<Result,sizeof(FunctorType)>* tsk =
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new fc::task<Result,sizeof(FunctorType)>( fc::forward<Functor>(f), desc );
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fc::future<Result> r(fc::shared_ptr< fc::promise<Result> >(tsk,true) );
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fc::asio::default_io_service().post( detail::parallel_completion_handler<fc::task<Result,sizeof(FunctorType)>>( tsk ) );
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return r;
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}
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}
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