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StopWatchPack_stopwatch.cpp
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00041 
00042 //#include <iostream>
00043 //#include <iosfwd>
00044 
00045 #include "StopWatchPack_stopwatch.hpp"
00046 #include "Teuchos_Time.hpp"
00047 
00048 double StopWatchPack::seconds(void)
00049 {
00050   return Teuchos::Time::wallTime();
00051 }
00052 
00053 /*
00054 
00055 #ifndef _INTEL_CXX
00056 
00057 // Implementation using C standard library.
00058 // In MS VC++ 6.0 the precision is only about 0.05 sec.
00059 
00060 #include <time.h>
00061 
00062 double StopWatchPack::seconds(void)
00063 {
00064     static const double secs_per_tick = ((double)1.0) / CLOCKS_PER_SEC;
00065   const clock_t ticks = clock();
00066   const double sec = ( (double) ticks ) * secs_per_tick;
00067   //std::cout << "ticks = " << ticks << ", sec = " << sec << std::endl;
00068     return sec;
00069 }
00070 
00071 #else // _INTEL_CXX implementation
00072 
00073 // Windows implementation.
00074 
00075 #define WIN32_LEAN_AND_MEAN
00076 #include <windows.h>
00077 #include <assert.h>
00078 
00079 namespace {
00080 
00081 bool seconds_initialized = false;
00082 LARGE_INTEGER start_count, count_freq;  // counts per sec.
00083 
00084 inline void seconds_initialize() {
00085   if( seconds_initialized ) return;
00086   // Figure out how often the performance counter increments
00087   ::QueryPerformanceFrequency( &count_freq );
00088   // Set this thread's priority as high as reasonably possible to prevent
00089     // timeslice interruptions
00090     ::SetThreadPriority( ::GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL );
00091   // Get the first count.
00092   TEUCHOS_TEST_FOR_EXCEPT( !(  QueryPerformanceCounter( &start_count )  ) );
00093   seconds_initialized = true;
00094 }
00095 
00096 } // end namespace
00097 
00098 double StopWatchPack::seconds(void)
00099 {
00100   seconds_initialize();
00101   LARGE_INTEGER count;
00102   QueryPerformanceCounter( &count );
00103   // "QuadPart" is a 64 bit integer (__int64).  VC++ supports them!
00104   const double
00105     sec = (double)( count.QuadPart - start_count.QuadPart ) / count_freq.QuadPart;
00106   //std::cout << "ticks = " << ticks << ", sec = " << sec << std::endl;
00107     return sec;
00108 }
00109 
00110 #endif  // _INTEL_CXX
00111 
00112 */
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