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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  *  Last modified:
00010  *     $Date: 2009-10-13 15:19:20 +0200 (Tue, 13 Oct 2009) $ by $Author: schulte $
00011  *     $Revision: 9887 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 #include <gecode/support.hh>
00039 
00040 namespace Gecode { namespace Support {
00041 
00042   /*
00043    * Threads
00044    */
00045   Mutex Thread::m;
00046   Thread::Run* Thread::idle = NULL;
00047 
00048   void
00049   Thread::Run::exec(void) {
00050     while (true) {
00051       // Execute runnable
00052       {
00053         Runnable* e;
00054         m.acquire();
00055         e=r; r=NULL;
00056         m.release();
00057         assert(e != NULL);
00058         e->run();
00059         delete e;
00060       }
00061       // Put into idle stack
00062       Thread::m.acquire();
00063       n=Thread::idle; Thread::idle=this;
00064       Thread::m.release();
00065       // Wait for next runnable
00066       e.wait();
00067     }
00068   }
00069 
00070 }}
00071 
00072 // STATISTICS: support-any