130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
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//=============================================================================
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#ifndef ICSPACE_STOP_WATCH_H
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#define ICSPACE_STOP_WATCH_H
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//== INCLUDES =================================================================
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#ifdef _WIN32
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# include <windows.h>
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#else // Unix
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# include <sys/time.h>
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#endif
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#include <iostream>
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//== NAMESPACE ================================================================
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//== CLASS DEFINITION =========================================================
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/// \addtogroup utility
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/// @{
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/// Simple class for a stop watch
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class Stop_watch
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{
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public:
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/// Constructor
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Stop_watch()
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: elapsed_(0.0), running_(false)
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{
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#ifdef _WIN32 // Windows
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QueryPerformanceFrequency(&freq_);
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#endif
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}
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/// Start time measurement
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void start()
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{
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elapsed_ = 0.0;
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cont();
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}
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/// Continue measurement, accumulates elapased times
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void cont()
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{
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#ifdef _WIN32 // Windows
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QueryPerformanceCounter(&starttime_);
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#else // Linux
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gettimeofday(&starttime_, 0);
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#endif
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running_ = true;
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}
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/// Stop time measurement, return elapsed time in ms
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double stop()
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{
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if (!running_)
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return 0.0;
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#ifdef _WIN32 // Windows
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QueryPerformanceCounter(&endtime_);
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elapsed_ += ((double)(endtime_.QuadPart - starttime_.QuadPart)
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/ (double)freq_.QuadPart * 1000.0f);
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#else // Unix
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gettimeofday(&endtime_, 0);
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elapsed_ += ((endtime_.tv_sec - starttime_.tv_sec )*1000.0 +
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(endtime_.tv_usec - starttime_.tv_usec)*0.001);
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#endif
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running_ = false;
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return elapsed();
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}
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/// Return elapsed time in ms (watch has to be stopped).
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double elapsed() const
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{
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if (running_)
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{
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std::cerr << "Stop_watch: stop watch before calling elapsed()\n";
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}
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return elapsed_;
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}
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bool is_running()
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{
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return running_;
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}
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private:
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double elapsed_;
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bool running_;
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#ifdef _WIN32 // Windows
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LARGE_INTEGER starttime_, endtime_;
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LARGE_INTEGER freq_;
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#else // Unix
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timeval starttime_, endtime_;
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#endif
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};
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//=============================================================================
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/// output a timer to a stream
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inline std::ostream&
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operator<<(std::ostream& _os, const Stop_watch& _timer)
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{
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_os << _timer.elapsed() << " ms";
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return _os;
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}
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//=============================================================================
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/// @}
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//=============================================================================
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#endif // ICSPACE_STOP_WATCH_H defined
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//=============================================================================
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