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// -*- C++ -*-

// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the terms

// of the GNU General Public License as published by the Free Software

// Foundation; either version 3, or (at your option) any later

// version.

// This library 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

// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

/** @file parallel/types.h

 *  @brief Basic types and typedefs.

 *  This file is a GNU parallel extension to the Standard C++ Library.

 */

// Written by Johannes Singler and Felix Putze.

#ifndef _GLIBCXX_PARALLEL_TYPES_H

#define _GLIBCXX_PARALLEL_TYPES_H 1

#include <cstdlib>

#include <limits>

#include <tr1/cstdint>

namespace __gnu_parallel

{

  // Enumerated types.

  /// Run-time equivalents for the compile-time tags.

  enum _Parallelism

    {

      /// Not parallel.

      sequential,

      /// Parallel unbalanced (equal-sized chunks).

      parallel_unbalanced,

      /// Parallel balanced (work-stealing).

      parallel_balanced,

      /// Parallel with OpenMP dynamic load-balancing.

      parallel_omp_loop,

      /// Parallel with OpenMP static load-balancing.

      parallel_omp_loop_static,

      /// Parallel with OpenMP taskqueue construct.

      parallel_taskqueue

    };

  /// Strategies for run-time algorithm selection: 

  // force_sequential, force_parallel, heuristic.

  enum _AlgorithmStrategy

    {

      heuristic,

      force_sequential,

      force_parallel

    };

  /// Sorting algorithms: 

  // multi-way mergesort, quicksort, load-balanced quicksort.

  enum _SortAlgorithm

    {

      MWMS,

      QS,

      QS_BALANCED

    };

  /// Merging algorithms: 

  // bubblesort-alike, loser-tree variants, enum __sentinel.

  enum _MultiwayMergeAlgorithm

    {

      LOSER_TREE

    };

  /// Partial sum algorithms: recursive, linear.

  enum _PartialSumAlgorithm

    {

      RECURSIVE,

      LINEAR

    };

  /// Sorting/merging algorithms: sampling, __exact.

  enum _SplittingAlgorithm

    {

      SAMPLING,

      EXACT

    };

  /// Find algorithms:

  // growing blocks, equal-sized blocks, equal splitting.

  enum _FindAlgorithm

    {

      GROWING_BLOCKS,

      CONSTANT_SIZE_BLOCKS,

      EQUAL_SPLIT

    };

  /**

   * @brief Unsigned integer to index __elements.

   * The total number of elements for each algorithm must fit into this type.

   */

  typedef uint64_t _SequenceIndex;

  /**

   * @brief Unsigned integer to index a thread number.

   * The maximum thread number (for each processor) must fit into this type.

   */

  typedef uint16_t _ThreadIndex;

  // XXX atomics interface?

  /// Longest compare-and-swappable integer type on this platform.

  typedef int64_t _CASable;

  /// Number of bits of _CASable.

  static const int _CASable_bits = std::numeric_limits<_CASable>::digits;

  /// ::_CASable with the right half of bits set to 1.

  static const _CASable _CASable_mask =

                            ((_CASable(1) << (_CASable_bits / 2)) - 1);

}

#endif /* _GLIBCXX_PARALLEL_TYPES_H */