time.h 2.6 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677
  1. /* System-dependent timing definitions. Linux version.
  2. Copyright (C) 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. The GNU C Library is free software; you can redistribute it and/or
  5. modify it under the terms of the GNU Lesser General Public
  6. License as published by the Free Software Foundation; either
  7. version 2.1 of the License, or (at your option) any later version.
  8. The GNU C Library is distributed in the hope that it will be useful,
  9. but WITHOUT ANY WARRANTY; without even the implied warranty of
  10. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11. Lesser General Public License for more details.
  12. You should have received a copy of the GNU Lesser General Public
  13. License along with the GNU C Library; if not, write to the Free
  14. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  15. 02111-1307 USA. */
  16. /*
  17. * Never include this file directly; use <time.h> instead.
  18. */
  19. #ifndef __need_timeval
  20. # ifndef _BITS_TIME_H
  21. # define _BITS_TIME_H 1
  22. /* ISO/IEC 9899:1990 7.12.1: <time.h>
  23. The macro `CLOCKS_PER_SEC' is the number per second of the value
  24. returned by the `clock' function. */
  25. /* CAE XSH, Issue 4, Version 2: <time.h>
  26. The value of CLOCKS_PER_SEC is required to be 1 million on all
  27. XSI-conformant systems. */
  28. # define CLOCKS_PER_SEC 1000000l
  29. /* Get the arch-specific value of __UCLIBC_CLK_TCK_CONST used for CLK_TCK
  30. * in sysconf() and clock(). */
  31. #include <bits/uClibc_clk_tck.h>
  32. # if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
  33. /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
  34. presents the real value for clock ticks per second for the system. */
  35. # include <bits/types.h>
  36. /* Note (uClibc): glibc #defines CLK_TCK as a sysconf() call. */
  37. # define CLK_TCK ((__clock_t) __UCLIBC_CLK_TCK_CONST)
  38. # endif
  39. # ifdef __USE_POSIX199309
  40. /* Identifier for system-wide realtime clock. */
  41. # define CLOCK_REALTIME 0
  42. /* High-resolution timer from the CPU. */
  43. # define CLOCK_PROCESS_CPUTIME_ID 2
  44. /* Thread-specific CPU-time clock. */
  45. # define CLOCK_THREAD_CPUTIME_ID 3
  46. /* Flag to indicate time is absolute. */
  47. # define TIMER_ABSTIME 1
  48. # endif
  49. # endif /* bits/time.h */
  50. #endif
  51. #ifdef __need_timeval
  52. # undef __need_timeval
  53. # ifndef _STRUCT_TIMEVAL
  54. # define _STRUCT_TIMEVAL 1
  55. # include <bits/types.h>
  56. /* A time value that is accurate to the nearest
  57. microsecond but also has a range of years. */
  58. struct timeval
  59. {
  60. __time_t tv_sec; /* Seconds. */
  61. __suseconds_t tv_usec; /* Microseconds. */
  62. };
  63. # endif /* struct timeval */
  64. #endif /* need timeval */