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worker.hh

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2004
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 #ifndef __GECODE_SEARCH_WORKER_HH__
00035 #define __GECODE_SEARCH_WORKER_HH__
00036 
00037 #include <gecode/search.hh>
00038 
00039 namespace Gecode { namespace Search {
00040 
00044   class Worker : public Statistics {
00045   protected:
00047     bool _stopped;
00049     unsigned long int root_depth;
00050   public:
00052     Worker(void);
00054     void start(void);
00056     bool stop(const Options& o);
00058     bool stopped(void) const;
00060     void reset(unsigned long int d=0);
00062     void stack_depth(unsigned long int d);
00064     unsigned long int steal_depth(unsigned long int d) const;
00065   };
00066 
00067 
00068 
00069   forceinline
00070   Worker::Worker(void)
00071     : _stopped(false), root_depth(0) {}
00072 
00073   forceinline void
00074   Worker::start(void) {
00075     _stopped = false;
00076   }
00077 
00078   forceinline bool
00079   Worker::stop(const Options& o) {
00080     if (o.stop == NULL)
00081       return false;
00082     _stopped |= o.stop->stop(*this,o);
00083     return _stopped;
00084   }
00085 
00086   forceinline bool
00087   Worker::stopped(void) const {
00088     return _stopped;
00089   }
00090 
00091   forceinline void
00092   Worker::reset(unsigned long int d) {
00093     Statistics::reset();
00094     root_depth = d;
00095     if (depth < d)
00096       depth = d;
00097   }
00098 
00099   forceinline void
00100   Worker::stack_depth(unsigned long int d) {
00101     if (depth < root_depth + d)
00102       depth = root_depth + d;
00103   }
00104 
00105   forceinline unsigned long int
00106   Worker::steal_depth(unsigned long int d) const {
00107     return root_depth + d;
00108   }
00109 
00110 }}
00111 
00112 #endif
00113 
00114 // STATISTICS: search-other