1 // TortoiseSVN - a Windows shell extension for easy version control
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3 // Copyright (C) 2007-2007 - TortoiseSVN
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5 // This program is free software; you can redistribute it and/or
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6 // modify it under the terms of the GNU General Public License
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7 // as published by the Free Software Foundation; either version 2
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8 // of the License, or (at your option) any later version.
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10 // This program is distributed in the hope that it will be useful,
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11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 // GNU General Public License for more details.
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15 // You should have received a copy of the GNU General Public License
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16 // along with this program; if not, write to the Free Software Foundation,
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17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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21 ///////////////////////////////////////////////////////////////
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25 // high resolution clock for performance measurement.
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26 // Depending on the hardware it will provide µsec
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27 // resolution and accuracy.
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29 // May not be available on all machines.
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31 ///////////////////////////////////////////////////////////////
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37 LARGE_INTEGER start;
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38 LARGE_INTEGER taken;
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42 // construction (starts measurement) / destruction
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58 QueryPerformanceCounter(&start);
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61 // set "taken" to time since last Start()
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65 QueryPerformanceCounter(&taken);
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66 taken.QuadPart -= start.QuadPart;
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69 // time in microseconds between last Start() and last Stop()
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71 DWORD GetMusecsTaken() const
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73 LARGE_INTEGER frequency;
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74 QueryPerformanceFrequency(&frequency);
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75 return (DWORD)((taken.QuadPart * 1000000) / frequency.QuadPart);
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