/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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//  If you do not agree to this license, do not download, install,
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//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009-2011, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
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// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
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//     derived from this software without specific prior written permission.
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//M*/

#include "precomp.hpp"

#ifdef HAVE_CONCURRENCY
#  include <ppl.h>
#elif defined HAVE_OPENMP
#  include <omp.h>
#elif defined HAVE_GCD
#  include <dispatch/dispatch.h>
#endif // HAVE_CONCURRENCY

namespace cv
{
    ParallelLoopBody::~ParallelLoopBody() { }

#ifdef HAVE_TBB
    class TbbProxyLoopBody
    {
    public:
        TbbProxyLoopBody(const ParallelLoopBody& _body) :
            body(&_body)
        { }

        void operator ()(const tbb::blocked_range<int>& range) const
        {
            body->operator()(Range(range.begin(), range.end()));
        }

    private:
        const ParallelLoopBody* body;
    };
#endif // end HAVE_TBB

#ifdef HAVE_GCD
    static
    void block_function(void* context, size_t index)
    {
        ParallelLoopBody* ptr_body = static_cast<ParallelLoopBody*>(context);
        ptr_body->operator()(Range(index, index + 1));
    }
#endif // HAVE_GCD

    void parallel_for_(const Range& range, const ParallelLoopBody& body)
    {
#ifdef HAVE_TBB

        tbb::parallel_for(tbb::blocked_range<int>(range.start, range.end), TbbProxyLoopBody(body));

#elif defined HAVE_CONCURRENCY

        Concurrency::parallel_for(range.start, range.end, body);

#elif defined HAVE_OPENMP

#pragma omp parallel for schedule(dynamic)
        for (int i = range.start; i < range.end; ++i)
            body(Range(i, i + 1));

#elif defined (HAVE_GCD)

        dispatch_queue_t concurrent_queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
        dispatch_apply_f(range.end - range.start, concurrent_queue, &const_cast<ParallelLoopBody&>(body), block_function);

#else

        body(range);

#endif // end HAVE_TBB
    }

} // namespace cv