1 /* System-dependent timing definitions. Linux version.
2 Copyright (C) 1996-2015 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 #if defined __need_timeval || defined __USE_GNU
24 # ifndef _STRUCT_TIMEVAL
25 # define _STRUCT_TIMEVAL 1
26 # include <bits/types.h>
27
28 /* A time value that is accurate to the nearest
29 microsecond but also has a range of years. */
30 struct timeval
31 {
32 __time_t tv_sec; /* Seconds. */
33 __suseconds_t tv_usec; /* Microseconds. */
34 };
35 # endif /* struct timeval */
36 #endif
37
38 #ifndef __need_timeval
39 # ifndef _BITS_TIME_H
40 # define _BITS_TIME_H 1
41
42 /* ISO/IEC 9899:1999 7.23.1: Components of time
43 The macro `CLOCKS_PER_SEC' is an expression with type `clock_t' that is
44 the number per second of the value returned by the `clock' function. */
45 /* CAE XSH, Issue 4, Version 2: <time.h>
46 The value of CLOCKS_PER_SEC is required to be 1 million on all
47 XSI-conformant systems. */
48 # define CLOCKS_PER_SEC ((clock_t) 1000000)
49
50 # if (!defined __STRICT_ANSI__ || defined __USE_POSIX) \
51 && !defined __USE_XOPEN2K
52 /* Even though CLOCKS_PER_SEC has such a strange value CLK_TCK
53 presents the real value for clock ticks per second for the system. */
54 # include <bits/types.h>
55 extern long int __sysconf (int);
56 # define CLK_TCK ((__clock_t) __sysconf (2)) /* 2 is _SC_CLK_TCK */
57 # endif
58
59 # ifdef __USE_POSIX199309
60 /* Identifier for system-wide realtime clock. */
61 # define CLOCK_REALTIME 0
62 /* Monotonic system-wide clock. */
63 # define CLOCK_MONOTONIC 1
64 /* High-resolution timer from the CPU. */
65 # define CLOCK_PROCESS_CPUTIME_ID 2
66 /* Thread-specific CPU-time clock. */
67 # define CLOCK_THREAD_CPUTIME_ID 3
68 /* Monotonic system-wide clock, not adjusted for frequency scaling. */
69 # define CLOCK_MONOTONIC_RAW 4
70 /* Identifier for system-wide realtime clock, updated only on ticks. */
71 # define CLOCK_REALTIME_COARSE 5
72 /* Monotonic system-wide clock, updated only on ticks. */
73 # define CLOCK_MONOTONIC_COARSE 6
74 /* Monotonic system-wide clock that includes time spent in suspension. */
75 # define CLOCK_BOOTTIME 7
76 /* Like CLOCK_REALTIME but also wakes suspended system. */
77 # define CLOCK_REALTIME_ALARM 8
78 /* Like CLOCK_BOOTTIME but also wakes suspended system. */
79 # define CLOCK_BOOTTIME_ALARM 9
80 /* Like CLOCK_REALTIME but in International Atomic Time. */
81 # define CLOCK_TAI 11
82
83 /* Flag to indicate time is absolute. */
84 # define TIMER_ABSTIME 1
85 # endif
86
87 # ifdef __USE_GNU
88 # include <bits/timex.h>
89
90 __BEGIN_DECLS
91
92 /* Tune a POSIX clock. */
93 extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
94
95 __END_DECLS
96 # endif /* use GNU */
97
98 # endif /* bits/time.h */
99 #endif
100
101 #undef __need_timeval
102