tjutil.c 2.2 KB

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  1. /*
  2. * Copyright (C)2011 D. R. Commander. All Rights Reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions are met:
  6. *
  7. * - Redistributions of source code must retain the above copyright notice,
  8. * this list of conditions and the following disclaimer.
  9. * - Redistributions in binary form must reproduce the above copyright notice,
  10. * this list of conditions and the following disclaimer in the documentation
  11. * and/or other materials provided with the distribution.
  12. * - Neither the name of the libjpeg-turbo Project nor the names of its
  13. * contributors may be used to endorse or promote products derived from this
  14. * software without specific prior written permission.
  15. *
  16. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
  17. * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19. * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  20. * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21. * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22. * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23. * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24. * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26. * POSSIBILITY OF SUCH DAMAGE.
  27. */
  28. #ifdef _WIN32
  29. #include <windows.h>
  30. static double getFreq(void)
  31. {
  32. LARGE_INTEGER freq;
  33. if (!QueryPerformanceFrequency(&freq)) return 0.0;
  34. return (double)freq.QuadPart;
  35. }
  36. static double f = -1.0;
  37. double getTime(void)
  38. {
  39. LARGE_INTEGER t;
  40. if (f < 0.0) f = getFreq();
  41. if (f == 0.0) return (double)GetTickCount() / 1000.;
  42. else {
  43. QueryPerformanceCounter(&t);
  44. return (double)t.QuadPart / f;
  45. }
  46. }
  47. #else
  48. #include <stdlib.h>
  49. #include <sys/time.h>
  50. double getTime(void)
  51. {
  52. struct timeval tv;
  53. if (gettimeofday(&tv, NULL) < 0) return 0.0;
  54. else return (double)tv.tv_sec + ((double)tv.tv_usec / 1000000.);
  55. }
  56. #endif