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thread.cpp

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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, 2009
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 #include <gecode/support.hh>
00035 
00036 namespace Gecode { namespace Support {
00037 
00038   /*
00039    * Threads
00040    */
00041 
00042   Mutex* Thread::m(void) {
00043     static Mutex* m = new Mutex;
00044     return m;
00045   }
00046 
00047   Thread::Run* Thread::idle = NULL;
00048 
00049   void
00050   Thread::Run::exec(void) {
00051     while (true) {
00052       // Execute runnable
00053       {
00054         Runnable* e;
00055         m.acquire();
00056         GECODE_ASSUME(r != NULL);
00057         e=r; r=NULL;
00058         m.release();
00059         assert(e != NULL);
00060         e->run();
00061         if (e->todelete()) {
00062           Terminator* t = e->terminator();
00063           delete e;
00064           if (t)
00065             t->terminated();
00066         }
00067       }
00068       // Put into idle stack
00069       Thread::m()->acquire();
00070       n=Thread::idle; Thread::idle=this;
00071       Thread::m()->release();
00072       // Wait for next runnable
00073       e.wait();
00074     }
00075   }
00076 
00077 }}
00078 
00079 // STATISTICS: support-any