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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: 2013-03-08 09:52:45 +0100 (Fri, 08 Mar 2013) $ by $Author: schulte $
11  * $Revision: 13481 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
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19  * "Software"), to deal in the Software without restriction, including
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25  * The above copyright notice and this permission notice shall be
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34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
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  master->constrain(*n);
50  master->master(i,n);
51  if (master->status(stop->m_stat) == SS_FAILED) {
52  delete master;
53  master = NULL;
54  e->reset(NULL);
55  } else {
56  Space* slave = master;
57  master = master->clone(shared);
58  slave->slave(i,n);
59  e->reset(slave);
60  }
61  return n;
62  } else if (e->stopped() && stop->enginestopped()) {
63  master->master(i,NULL);
64  long unsigned int nl = (*co)();
65  stop->limit(e->statistics(),nl);
66  if (master->status(stop->m_stat) == SS_FAILED)
67  return NULL;
68  Space* slave = master;
69  master = master->clone(shared);
70  slave->slave(i,n);
71  e->reset(slave);
72  } else {
73  return NULL;
74  }
75  }
77  return NULL;
78  }
79 
81  RBS::statistics(void) const {
82  return stop->metastatistics()+e->statistics();
83  }
84 
85  bool
86  RBS::stopped(void) const {
87  /*
88  * What might happen during parallel search is that the
89  * engine has been stopped but the meta engine has not, so
90  * the meta engine does not perform a restart. However the
91  * invocation of next will do so and no restart will be
92  * missed.
93  */
94  return e->stopped();
95  }
96 
97  void
99  }
100 
101  RBS::~RBS(void) {
102  // Deleting e also deletes stop
103  delete e;
104  delete master;
105  delete co;
106  }
107 
108 }}}
109 
110 // STATISTICS: search-other