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/*
* Copyright (c) 2016 University of Cordoba and University of Illinois
* All rights reserved.
*
* Developed by: IMPACT Research Group
* University of Cordoba and University of Illinois
* http://impact.crhc.illinois.edu/
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* with the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* > Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimers.
* > Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimers in the
* documentation and/or other materials provided with the distribution.
* > Neither the names of IMPACT Research Group, University of Cordoba,
* University of Illinois nor the names of its contributors may be used
* to endorse or promote products derived from this Software without
* specific prior written permission.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH
* THE SOFTWARE.
*
*/
#include "kernel.h"
#include "support/partitioner.h"
#include <math.h>
#include <thread>
#include <vector>
#include <algorithm>
// CPU threads--------------------------------------------------------------------------------------
void run_cpu_threads(std::atomic_uint *histo, unsigned int *data, int size, int bins, int n_threads, int chunk, int n_tasks, float alpha
#ifdef CUDA_8_0
, std::atomic_int *worklist
#endif
) {
std::vector<std::thread> cpu_threads;
for(int k = 0; k < n_threads; k++) {
cpu_threads.push_back(std::thread([=]() {
#ifdef CUDA_8_0
Partitioner p = partitioner_create(n_tasks, alpha, k, n_threads, worklist);
#else
Partitioner p = partitioner_create(n_tasks, alpha, k, n_threads);
#endif
unsigned int Hs[bins];
// Local histogram initialization
for(int i = 0; i < bins; i++) {
Hs[i] = 0;
}
for(int i = cpu_first(&p); cpu_more(&p); i = cpu_next(&p)) {
for(int j = 0; j < chunk; j++) {
// Read pixel
unsigned int d = ((data[i * chunk + j] * bins) >> 12);
// Vote in histogram
Hs[d]++;
}
}
// Merge to global histogram
for(int i = 0; i < bins; i++) {
(&histo[i])->fetch_add(Hs[i]);
}
}));
}
std::for_each(cpu_threads.begin(), cpu_threads.end(), [](std::thread &t) { t.join(); });
}
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