cputime.c 1.9 KB

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  1. /*
  2. * File : cputime.h
  3. * This file is part of RT-Thread RTOS
  4. * COPYRIGHT (C) 2017, RT-Thread Development Team
  5. *
  6. * This program is free software; you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation; either version 2 of the License, or
  9. * (at your option) any later version.
  10. *
  11. * This program is distributed in the hope that it will be useful,
  12. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14. * GNU General Public License for more details.
  15. *
  16. * You should have received a copy of the GNU General Public License along
  17. * with this program; if not, write to the Free Software Foundation, Inc.,
  18. * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19. *
  20. * Change Logs:
  21. * Date Author Notes
  22. * 2017-12-23 Bernard first version
  23. */
  24. #include <rtdevice.h>
  25. #include <rtthread.h>
  26. static const struct rt_clock_cputime_ops *_cputime_ops = RT_NULL;
  27. /**
  28. * The clock_cpu_getres() function shall return the resolution of CPU time, the
  29. * number of nanosecond per tick.
  30. */
  31. uint32_t clock_cpu_getres(void)
  32. {
  33. if (_cputime_ops)
  34. return _cputime_ops->cputime_getres();
  35. rt_set_errno(-ENOSYS);
  36. return 0;
  37. }
  38. /**
  39. * The clock_cpu_gettime() function shall return the current value of cpu time tick.
  40. */
  41. uint32_t clock_cpu_gettime(void)
  42. {
  43. if (_cputime_ops)
  44. return _cputime_ops->cputime_gettime();
  45. rt_set_errno(-ENOSYS);
  46. return 0;
  47. }
  48. /**
  49. * The clock_cpu_seops() function shall set the ops of cpu time.
  50. *
  51. * @return always return 0.
  52. */
  53. int clock_cpu_setops(const struct rt_clock_cputime_ops *ops)
  54. {
  55. _cputime_ops = ops;
  56. if (ops)
  57. {
  58. RT_ASSERT(ops->cputime_getres != RT_NULL);
  59. RT_ASSERT(ops->cputime_gettime != RT_NULL);
  60. }
  61. return 0;
  62. }