1 | /* System-dependent timing definitions. Linux version. |
2 | Copyright (C) 1996-2020 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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | /* |
20 | * Never include this file directly; use <time.h> instead. |
21 | */ |
22 | |
23 | #ifndef _BITS_TIME_H |
24 | #define _BITS_TIME_H 1 |
25 | |
26 | #include <bits/types.h> |
27 | |
28 | /* ISO/IEC 9899:1999 7.23.1: Components of time |
29 | The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is |
30 | the number per second of the value returned by the `clock' function. */ |
31 | /* CAE XSH, Issue 4, Version 2: <time.h> |
32 | The value of CLOCKS_PER_SEC is required to be 1 million on all |
33 | XSI-conformant systems. */ |
34 | #define CLOCKS_PER_SEC ((__clock_t) 1000000) |
35 | |
36 | #if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \ |
37 | && !defined __USE_XOPEN2K |
38 | /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK |
39 | presents the real value for clock ticks per second for the system. */ |
40 | extern long int __sysconf (int); |
41 | # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */ |
42 | #endif |
43 | |
44 | #ifdef __USE_POSIX199309 |
45 | /* Identifier for system-wide realtime clock. */ |
46 | # define CLOCK_REALTIME 0 |
47 | /* Monotonic system-wide clock. */ |
48 | # define CLOCK_MONOTONIC 1 |
49 | /* High-resolution timer from the CPU. */ |
50 | # define CLOCK_PROCESS_CPUTIME_ID 2 |
51 | /* Thread-specific CPU-time clock. */ |
52 | # define CLOCK_THREAD_CPUTIME_ID 3 |
53 | /* Monotonic system-wide clock, not adjusted for frequency scaling. */ |
54 | # define CLOCK_MONOTONIC_RAW 4 |
55 | /* Identifier for system-wide realtime clock, updated only on ticks. */ |
56 | # define CLOCK_REALTIME_COARSE 5 |
57 | /* Monotonic system-wide clock, updated only on ticks. */ |
58 | # define CLOCK_MONOTONIC_COARSE 6 |
59 | /* Monotonic system-wide clock that includes time spent in suspension. */ |
60 | # define CLOCK_BOOTTIME 7 |
61 | /* Like CLOCK_REALTIME but also wakes suspended system. */ |
62 | # define CLOCK_REALTIME_ALARM 8 |
63 | /* Like CLOCK_BOOTTIME but also wakes suspended system. */ |
64 | # define CLOCK_BOOTTIME_ALARM 9 |
65 | /* Like CLOCK_REALTIME but in International Atomic Time. */ |
66 | # define CLOCK_TAI 11 |
67 | |
68 | /* Flag to indicate time is absolute. */ |
69 | # define TIMER_ABSTIME 1 |
70 | #endif |
71 | |
72 | #ifdef __USE_GNU |
73 | # include <bits/timex.h> |
74 | |
75 | __BEGIN_DECLS |
76 | |
77 | /* Tune a POSIX clock. */ |
78 | extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW; |
79 | |
80 | __END_DECLS |
81 | #endif /* use GNU */ |
82 | |
83 | #endif /* bits/time.h */ |
84 | |