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activity.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2012
8  *
9  * Last modified:
10  * $Date: 2014-05-27 14:57:59 +0200 (Tue, 27 May 2014) $ by $Author: schulte $
11  * $Revision: 14124 $
12  *
13  * This file is part of Gecode, the generic constraint
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37 
38 #include <gecode/kernel.hh>
39 
40 namespace Gecode {
41 
42  const Activity Activity::def;
43 
45  : storage(a.storage) {
46  if (storage != NULL) {
47  acquire();
48  storage->use_cnt++;
49  release();
50  }
51  }
52 
53  Activity&
55  if (storage != a.storage) {
56  if (storage != NULL) {
57  bool done;
58  acquire();
59  done = (--storage->use_cnt == 0);
60  release();
61  if (done)
62  delete storage;
63  }
64  storage = a.storage;
65  if (storage != NULL) {
66  acquire();
67  storage->use_cnt++;
68  release();
69  }
70  }
71  return *this;
72  }
73 
75  if (storage == NULL)
76  return;
77  bool done;
78  acquire();
79  done = (--storage->use_cnt == 0);
80  release();
81  if (done)
82  delete storage;
83  }
84 
85  void
87  const_cast<Activity&>(a).acquire();
88  storage = a.storage;
89  storage->use_cnt++;
90  const_cast<Activity&>(a).release();
91  }
92 
93  void
94  Activity::set(Space&, double a) {
95  acquire();
96  for (int i=storage->n; i--; )
97  storage->a[i] = a;
98  release();
99  }
100 
101  void
102  Activity::decay(Space&, double d) {
103  if ((d < 0.0) || (d > 1.0))
104  throw IllegalDecay("Activity");
105  acquire();
106  storage->d = d;
107  release();
108  }
109 
110  double
111  Activity::decay(const Space&) const {
112  double d;
113  const_cast<Activity*>(this)->acquire();
114  d = storage->d;
115  const_cast<Activity*>(this)->release();
116  return d;
117  }
118 
119 }
120 
121 // STATISTICS: kernel-branch
void acquire(void)
Acquire mutex.
Definition: activity.hpp:325
void update(int i)
Update activity value at position i.
Definition: activity.hpp:303
void set(Space &home, double a=0.0)
Set activity to a.
Definition: activity.cpp:94
Computation spaces.
Definition: core.hpp:1362
Gecode::IntSet d(v, 7)
double * a
Activity values.
Definition: activity.hpp:56
Gecode::IntArgs i(4, 1, 2, 3, 4)
Activity(void)
Construct as not yet intialized.
Definition: activity.hpp:335
void release(void)
Release mutex.
Definition: activity.hpp:329
int n
Number of activity values.
Definition: activity.hpp:58
~Activity(void)
Destructor.
Definition: activity.cpp:74
Activity & operator=(const Activity &a)
Assignment operator.
Definition: activity.cpp:54
Storage * storage
Pointer to storage object.
Definition: activity.hpp:74
static const Activity def
Default (empty) activity information.
Definition: activity.hpp:114
void decay(int i)
Decay activity value at position i.
Definition: activity.hpp:309
unsigned int use_cnt
How many references exist for this object.
Definition: activity.hpp:54
Gecode toplevel namespace
Class for activity management.
Definition: activity.hpp:44
Exception: illegal decay factor
Definition: exception.hpp:90
struct Gecode::@518::NNF::@57::@59 a
For atomic nodes.
double d
Decay factor.
Definition: activity.hpp:60