pbs.hh

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.dev>
 *
 *  Copyright:
 *     Christian Schulte, 2015
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.dev
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
 *  "Software"), to deal in 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:
 *
 *  The above copyright notice and this permission notice shall be
 *  included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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 */
 
#ifndef GECODE_SEARCH_SEQ_PBS_HH
#define GECODE_SEARCH_SEQ_PBS_HH
 
#include <gecode/search.hh>
 
namespace Gecode { namespace Search { namespace Seq {

  class SharedStopInfo {
  public:
    bool done;
    unsigned long long int l;
  };

  class GECODE_SEARCH_EXPORT PortfolioStop : public Stop {
  private:
    Stop* so;
    SharedStopInfo* ssi;
  public:
    PortfolioStop(Stop* so);
    void share(SharedStopInfo* ssi);
    virtual bool stop(const Statistics& s, const Options& o);
  };

  class Slave {
  protected:
    Engine* slave;
    Stop* stop;
  public:
    Slave(void);
    Slave(const Slave& s) = default;
    Slave& operator =(const Slave& s) = default;
    void init(Engine* s, Stop* so);
    Space* next(void);
    Statistics statistics(void) const;
    bool stopped(void) const;
    void constrain(const Space& b);
    void run(void);
    ~Slave(void);
  };

  template<bool best>
  class GECODE_SEARCH_EXPORT PBS : public Engine {
  protected:
    Statistics stat;
    SharedStopInfo ssi;
    unsigned int slice;
    Slave* slaves;
    unsigned int n_slaves;
    unsigned int cur;
    bool slave_stop;
  public:
    PBS(Engine** slaves, Stop** stops, unsigned int n,
        const Statistics& stat, const Search::Options& opt);
    virtual Space* next(void);
    virtual Statistics statistics(void) const;
    virtual bool stopped(void) const;
    virtual void constrain(const Space& b);
    virtual ~PBS(void);
  };
 
}}}
 
#include <gecode/search/seq/pbs.hpp>
 
#endif
 
// STATISTICS: search-seq