timer.c 2.4 KB

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  1. /* $Id: timer.c 2006 2008-05-01 04:46:55Z aturner $ */
  2. /*
  3. * Copyright (c) 2001-2007 Aaron Turner.
  4. * All rights reserved.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions
  8. * are met:
  9. *
  10. * 1. Redistributions of source code must retain the above copyright
  11. * notice, this list of conditions and the following disclaimer.
  12. * 2. Redistributions in binary form must reproduce the above copyright
  13. * notice, this list of conditions and the following disclaimer in the
  14. * documentation and/or other materials provided with the distribution.
  15. * 3. Neither the names of the copyright owners nor the names of its
  16. * contributors may be used to endorse or promote products derived from
  17. * this software without specific prior written permission.
  18. *
  19. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  23. * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  25. * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26. * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  27. * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28. * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  29. * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30. */
  31. #include "config.h"
  32. #include "defines.h"
  33. #include "common.h"
  34. #include "timer.h"
  35. #include <stdlib.h>
  36. /* Miscellaneous timeval routines */
  37. /**
  38. * Divide tvp by div, storing the result in tvp
  39. */
  40. void
  41. timerdiv(struct timeval *tvp, float div)
  42. {
  43. double interval;
  44. if (div == 0 || div == 1)
  45. return;
  46. interval = ((double)tvp->tv_sec * 1000000 + tvp->tv_usec) / (double)div;
  47. tvp->tv_sec = interval / (int)1000000;
  48. tvp->tv_usec = interval - (tvp->tv_sec * 1000000);
  49. }
  50. /* Divide tvs by div, storing the result in tvs */
  51. void timesdiv(struct timespec *tvs, float div)
  52. {
  53. double interval;
  54. if (div == 0 || div == 1)
  55. return;
  56. interval = ((double)tvs->tv_sec * 1000000000 + tvs->tv_nsec) / (double)div;
  57. tvs->tv_sec = interval / (int)1000000000;
  58. tvs->tv_nsec = interval - (tvs->tv_nsec * 1000000000);
  59. }