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rbs.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  *
6  * Copyright:
7  * Guido Tack, 2012
8  *
9  * Last modified:
10  * $Date: 2013-07-11 12:30:18 +0200 (Thu, 11 Jul 2013) $ by $Author: schulte $
11  * $Revision: 13840 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
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37 
38 
40 
41 namespace Gecode { namespace Search { namespace Meta {
42 
43  Space*
44  RBS::next(void) {
45  while (true) {
46  Space* n = e->next();
47  unsigned long int i = stop->m_stat.restart;
48  if (n != NULL) {
49  NoGoods& ng = e->nogoods();
50  ng.ng(0);
51  master->constrain(*n);
52  master->master(i,n,ng);
53  stop->m_stat.nogood += ng.ng();
54  if (master->status(stop->m_stat) == SS_FAILED) {
55  delete master;
56  master = NULL;
57  e->reset(NULL);
58  } else {
59  Space* slave = master;
60  master = master->clone(shared);
61  slave->slave(i,n);
62  e->reset(slave);
63  }
64  return n;
65  } else if (e->stopped() && stop->enginestopped()) {
66  NoGoods& ng = e->nogoods();
67  ng.ng(0);
68  master->master(i,NULL,ng);
69  stop->m_stat.nogood += ng.ng();
70  long unsigned int nl = (*co)();
71  stop->limit(e->statistics(),nl);
72  if (master->status(stop->m_stat) == SS_FAILED)
73  return NULL;
74  Space* slave = master;
75  master = master->clone(shared);
76  slave->slave(i,n);
77  e->reset(slave);
78  } else {
79  return NULL;
80  }
81  }
83  return NULL;
84  }
85 
87  RBS::statistics(void) const {
88  return stop->metastatistics()+e->statistics();
89  }
90 
91  bool
92  RBS::stopped(void) const {
93  /*
94  * What might happen during parallel search is that the
95  * engine has been stopped but the meta engine has not, so
96  * the meta engine does not perform a restart. However the
97  * invocation of next will do so and no restart will be
98  * missed.
99  */
100  return e->stopped();
101  }
102 
103  void
105  }
106 
107  NoGoods RBS::eng;
108 
109  NoGoods&
110  RBS::nogoods(void) {
111  return eng;
112  }
113 
114  RBS::~RBS(void) {
115  // Deleting e also deletes stop
116  delete e;
117  delete master;
118  delete co;
119  }
120 
121 }}}
122 
123 // STATISTICS: search-other