blob: 19c7ab0997dc4afd8d39c6efc58de85ab65f9561 [file] [log] [blame]
xf.libdd93d52023-05-12 07:10:14 -07001/* System-dependent timing definitions. Generic version.
2 Copyright (C) 1996-2016 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19/*
20 * Never include this file directly; use <time.h> instead.
21 */
22
23#ifndef __need_timeval
24# ifndef _BITS_TIME_H
25# define _BITS_TIME_H 1
26
27/* ISO/IEC 9899:1999 7.23.1: Components of time
28 The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is
29 the number per second of the value returned by the `clock' function. */
30/* CAE XSH, Issue 4, Version 2: <time.h>
31 The value of CLOCKS_PER_SEC is required to be 1 million on all
32 XSI-conformant systems. */
33# define CLOCKS_PER_SEC ((clock_t) 1000000)
34
35# if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
36/* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
37 presents the real value for clock ticks per second for the system. */
38# include <bits/types.h>
39extern long int __sysconf (int);
40# define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */
41# endif
42
43# ifdef __USE_POSIX199309
44/* Identifier for system-wide realtime clock. */
45# define CLOCK_REALTIME 0
46/* Monotonic system-wide clock. */
47# define CLOCK_MONOTONIC 1
48/* High-resolution timer from the CPU. */
49# define CLOCK_PROCESS_CPUTIME_ID 2
50/* Thread-specific CPU-time clock. */
51# define CLOCK_THREAD_CPUTIME_ID 3
52/* Monotonic system-wide clock, not adjusted for frequency scaling. */
53# define CLOCK_MONOTONIC_RAW 4
54/* Identifier for system-wide realtime clock, updated only on ticks. */
55# define CLOCK_REALTIME_COARSE 5
56/* Monotonic system-wide clock, updated only on ticks. */
57# define CLOCK_MONOTONIC_COARSE 6
58
59/* Flag to indicate time is absolute. */
60# define TIMER_ABSTIME 1
61# endif
62
63# endif /* bits/time.h */
64#endif
65
66#ifdef __need_timeval
67# undef __need_timeval
68# ifndef _STRUCT_TIMEVAL
69# define _STRUCT_TIMEVAL 1
70# include <bits/types.h>
71
72/* A time value that is accurate to the nearest
73 microsecond but also has a range of years. */
74struct timeval
75 {
76 __time_t tv_sec; /* Seconds. */
77 __suseconds_t tv_usec; /* Microseconds. */
78 };
79# endif /* struct timeval */
80#endif /* need timeval */