GPUReconstructionThreading.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#if !defined(GPURECONSTRUCTIONTHREADING_H)
#define GPURECONSTRUCTIONTHREADING_H
 
#if !defined(GPUCA_GPUCODE)
#include "GPUReconstruction.h"
 
#include <memory>
#include <oneapi/tbb.h>
 
namespace o2::gpu
{
 
struct GPUReconstructionThreading {
  std::unique_ptr<tbb::global_control> control;
  std::unique_ptr<tbb::task_arena> allThreads;
  std::unique_ptr<tbb::task_arena> activeThreads;
  std::unique_ptr<tbb::task_arena> outerThreads;
};
 
} // namespace o2::gpu
 
#endif
 
#define GPUCA_TBB_KERNEL_LOOP_HOST(rec, vartype, varname, iEnd, code)                       \
  for (vartype varname = get_global_id(0); varname < iEnd; varname += get_global_size(0)) { \
    code                                                                                    \
  }
 
#ifdef GPUCA_GPUCODE
#define GPUCA_TBB_KERNEL_LOOP GPUCA_TBB_KERNEL_LOOP_HOST
#else
#define GPUCA_TBB_KERNEL_LOOP(rec, vartype, varname, iEnd, code)                                                                                       \
  if (!rec.GetProcessingSettings().inKernelParallel) {                                                                                                 \
    rec.mThreading->activeThreads->execute([&] {                                                                                                       \
      tbb::parallel_for(tbb::blocked_range<vartype>(get_global_id(0), iEnd, get_global_size(0)), [&](const tbb::blocked_range<vartype>& _r_internal) { \
        for (vartype varname = _r_internal.begin(); varname < _r_internal.end(); varname += get_global_size(0)) {                                      \
          code                                                                                                                                         \
        }                                                                                                                                              \
      });                                                                                                                                              \
    });                                                                                                                                                \
  } else {                                                                                                                                             \
    GPUCA_TBB_KERNEL_LOOP_HOST(rec, vartype, varname, iEnd, code)                                                                                      \
  }
#endif
 
#endif