scheduler_mtapi.h 4.52 KB
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/*
Marcus Winter committed
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 * Copyright (c) 2014-2016, Siemens AG. All rights reserved.
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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:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef EMBB_DATAFLOW_INTERNAL_SCHEDULER_MTAPI_H_
#define EMBB_DATAFLOW_INTERNAL_SCHEDULER_MTAPI_H_

#include <embb/dataflow/internal/action.h>
#include <embb/dataflow/internal/scheduler.h>
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#include <embb/mtapi/mtapi.h>
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#include <embb/base/function.h>

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#include <algorithm>

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namespace embb {
namespace dataflow {
namespace internal {

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#define EMBB_DATAFLOW_JOB_ID 1

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class SchedulerMTAPI : public Scheduler {
 public:
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  explicit SchedulerMTAPI(int slices)
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    : slices_(slices) {
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    embb::mtapi::Node & node = embb::mtapi::Node::GetInstance();

    job_ = node.GetJob(EMBB_DATAFLOW_JOB_ID);
    action_ = node.CreateAction(EMBB_DATAFLOW_JOB_ID, SchedulerMTAPI::action_func);
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    group_ = reinterpret_cast<embb::mtapi::Group*>(
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      embb::base::Allocation::Allocate(
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      sizeof(embb::mtapi::Group)*slices_));
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    for (int ii = 0; ii < slices_; ii++) {
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      group_[ii] = node.CreateGroup();
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    }
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    queue_count_ = std::min(
      static_cast<int>(node.GetQueueCount()),
      static_cast<int>(node.GetWorkerThreadCount()) );
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    queue_ = reinterpret_cast<embb::mtapi::Queue*>(
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      embb::base::Allocation::Allocate(
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      sizeof(embb::mtapi::Queue)*queue_count_));
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    embb::mtapi::QueueAttributes queue_attr;
    queue_attr
      .SetPriority(0)
      .SetOrdered(true);
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    for (int ii = 0; ii < queue_count_; ii++) {
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      queue_[ii] = node.CreateQueue(job_, queue_attr);
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    }
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  }
  virtual ~SchedulerMTAPI() {
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    if (embb::mtapi::Node::IsInitialized()) {
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      // only destroy groups and queues if there still is an instance
      for (int ii = 0; ii < slices_; ii++) {
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        group_[ii].WaitAll(MTAPI_INFINITE);
        group_[ii].Delete();
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      }
      for (int ii = 0; ii < queue_count_; ii++) {
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        queue_[ii].Delete();
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      }
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      // delete action as well
      action_.Delete();
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    }
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    embb::base::Allocation::Free(group_);
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    embb::base::Allocation::Free(queue_);
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  }
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  virtual void Start(Action & action) {
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    const int idx = action.GetClock() % slices_;
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    group_[idx].Start(job_, &action, static_cast<void*>(NULL));
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  }
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  virtual void Enqueue(int process_id, Action & action) {
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    const int idx = action.GetClock() % slices_;
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    const int queue_id = process_id % queue_count_;
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    queue_[queue_id].Enqueue(&action, static_cast<void*>(NULL), group_[idx]);
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  }
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  virtual void WaitForSlice(int slice) {
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    group_[slice].WaitAll(MTAPI_INFINITE);
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    // group is invalid now, recreate
    embb::mtapi::Node & node = embb::mtapi::Node::GetInstance();
    group_[slice] = node.CreateGroup();
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  }

 private:
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  static void action_func(
    const void* args,
    mtapi_size_t /*args_size*/,
    void* /*result_buffer*/,
    mtapi_size_t /*result_buffer_size*/,
    const void* /*node_local_data*/,
    mtapi_size_t /*node_local_data_size*/,
    mtapi_task_context_t * context) {
    Action * action =
      reinterpret_cast<Action*>(const_cast<void*>(args));
    embb::mtapi::TaskContext task_context(context);
    action->RunMTAPI(task_context);
  }

  embb::mtapi::Action action_;
  embb::mtapi::Job job_;
  embb::mtapi::Group * group_;
  embb::mtapi::Queue * queue_;
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  int queue_count_;
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  int slices_;
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};

} // namespace internal
} // namespace dataflow
} // namespace embb

#endif // EMBB_DATAFLOW_INTERNAL_SCHEDULER_MTAPI_H_