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parallel_for.h
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parallel_for.h
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//
//---------------------------------------------------------------------------
//
// Copyright(C) 2017 Alexey Lysiuk
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see http://www.gnu.org/licenses/
//
//--------------------------------------------------------------------------
//
#pragma once
#ifndef PARALLEL_FOR_H_INCLUDED
#define PARALLEL_FOR_H_INCLUDED
#ifdef HAVE_PARALLEL_FOR
#include <ppl.h>
template <typename Index, typename Function>
inline void parallel_for(const Index first, const Index last, const Index step, const Function& function)
{
concurrency::parallel_for(first, last, step, function);
}
#elif defined HAVE_DISPATCH_APPLY
#include <dispatch/dispatch.h>
template <typename Index, typename Function>
inline void parallel_for(const Index first, const Index last, const Index step, const Function& function)
{
const dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_apply((last - first) / step + 1, queue, ^(size_t slice)
{
function(slice * step);
});
}
#else // Generic loop with optional OpenMP parallelization
template <typename Index, typename Function>
inline void parallel_for(const Index first, const Index last, const Index step, const Function& function)
{
#pragma omp parallel for
for (Index i = first; i < last; i += step)
{
function(i);
}
}
#endif // HAVE_PARALLEL_FOR
template <typename Index, typename Function>
inline void parallel_for(const Index count, const Function& function)
{
parallel_for(0, count, 1, function);
}
template <typename Index, typename Function>
inline void parallel_for(const Index count, const Index step, const Function& function)
{
parallel_for(0, count, step, function);
}
#endif // PARALLEL_FOR_H_INCLUDED