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timer.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Mikael Lagerkvist <lagerkvist@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Mikael Lagerkvist, 2009
00008  *
00009  *  Last modified:
00010  *     $Date: 2010-07-14 17:46:18 +0200 (Wed, 14 Jul 2010) $ by $Author: schulte $
00011  *     $Revision: 11192 $
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
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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
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00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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00037 
00038 #ifdef GECODE_USE_GETTIMEOFDAY
00039 #include <sys/time.h>
00040 #endif
00041 
00042 #ifdef GECODE_USE_CLOCK
00043 #include <ctime>
00044 #endif
00045 
00046 namespace Gecode { namespace Support {
00047 
00055   class GECODE_SUPPORT_EXPORT Timer {
00056   private:
00057 #if   defined(GECODE_USE_GETTIMEOFDAY)
00058     timeval t0; 
00059 #elif defined(GECODE_USE_CLOCK)
00060     clock_t t0; 
00061 #endif
00062   public:
00064     void start(void);
00066     double stop(void);
00067   };
00068 
00069   inline void
00070   Timer::start(void) {
00071 #if   defined(GECODE_USE_GETTIMEOFDAY)
00072     if (gettimeofday(&t0, NULL))
00073       throw OperatingSystemError("Timer::start[gettimeofday]");
00074 #elif defined(GECODE_USE_CLOCK)
00075     t0 = clock();
00076 #endif
00077   }
00078 
00079   inline double
00080   Timer::stop(void) {
00081 #if   defined(GECODE_USE_GETTIMEOFDAY)
00082     timeval t1, t;
00083     if (gettimeofday(&t1, NULL))
00084       throw OperatingSystemError("Timer::stop[gettimeofday]");
00085     
00086     // t = t1 - t2
00087     t.tv_sec = t1.tv_sec - t0.tv_sec;
00088     t.tv_usec = t1.tv_usec - t0.tv_usec;
00089     if (t.tv_usec < 0) {
00090       t.tv_sec--;
00091       t.tv_usec += 1000000;
00092     }
00093     
00094     return (static_cast<double>(t.tv_sec) * 1000.0) + 
00095       (static_cast<double>(t.tv_usec)/1000.0);
00096 #elif defined(GECODE_USE_CLOCK)
00097     return (static_cast<double>(clock()-t0) / CLOCKS_PER_SEC) * 1000.0;
00098 #endif
00099   }
00100 
00101 }}
00102 
00103 // STATISTICS: support-any